public readonly struct DocumentMetadata
{
    public readonly int PageCount { get; init; }
    public readonly long FileSize { get; init; }
    public readonly DateTime CreatedAt { get; init; }

    // With .NET 10, this struct's members go directly to registers
    // No memory round-trips when passed to methods
}

public class DocumentProcessor
{
    // This method call is now significantly faster
    public ProcessingResult AnalyzeDocument(DocumentMetadata metadata)
    {
        // Struct members are already in registers
        // Direct CPU operations without memory access
        return ProcessDocument(metadata.PageCount, metadata.FileSize);
    }
}

// Before .NET 10: Virtual dispatch overhead
IEnumerable<byte> ProcessBytes(IEnumerable<byte> input)
{
    return input.Select(b => (byte)(b ^ 0xFF));
}

// .NET 10: Fully devirtualized and inlined
// Performance now matches direct array manipulation
byte[] OptimizedProcess(byte[] input)
{
    // JIT recognizes array type at compile time
    // Eliminates virtual dispatch entirely
    return input.Select(b => (byte)(b ^ 0xFF)).ToArray();
}

using System.Runtime.Intrinsics.X86;

public class VectorProcessor
{
    public static unsafe void ProcessDocumentVectors(float* data, int length)
    {
        // AVX10.2 will enable 512-bit vector operations
        // 16 float operations in a single CPU instruction
        if (Avx10v2.IsSupported)
        {
            // Future-proof code for when hardware arrives
            // Massive parallelization for AI and document processing
        }
    }
}

public class DocumentEntity
{
    // Before C# 14: Boilerplate everywhere
    private string _documentId;
    public string DocumentId
    {
        get => _documentId;
        set
        {
            if (string.IsNullOrWhiteSpace(value))
                throw new ArgumentException("Document ID cannot be empty");
            _documentId = value;
            OnPropertyChanged(nameof(DocumentId));
        }
    }

    // C# 14: Clean, self-contained properties
    public string DocumentId
    {
        get;
        set
        {
            ArgumentException.ThrowIfNullOrWhiteSpace(value);
            field = value;  // 'field' represents the compiler-generated backing field
            OnPropertyChanged(nameof(DocumentId));
        }
    }
}

public class LegacyClass
{
    private int field; // Existing field named 'field'

    public int Property
    {
        get => @field;     // Reference the member field
        set => field = value; // Reference the backing field
    }
}

namespace IronSoftware.Extensions;

public static class DocumentExtensions
{
    // Instance extension block
    extension<T>(IEnumerable<T> source)
    {
        // Extension property
        public bool IsEmpty => !source.Any();

        // Extension method with cleaner syntax
        public T FirstOrFallback(T fallback) 
            => source.FirstOrDefault() ?? fallback;
    }

    // Static extension block
    extension<T>(IEnumerable<T>)
    {
        // Static extension property
        public static IEnumerable<T> Empty => Enumerable.Empty<T>();

        // Extension operators - game changer!
        public static IEnumerable<T> operator +(
            IEnumerable<T> left, 
            IEnumerable<T> right) => left.Concat(right);
    }
}

// Usage becomes incredibly natural
public class DocumentService
{
    public void ProcessDocuments()
    {
        var documents = GetDocuments();

        // Property access feels native
        if (documents.IsEmpty)
            return;

        // Operator overloading for collections!
        var combined = documents + GetArchivedDocuments();

        // Static member access
        var empty = IEnumerable<Document>.Empty;
    }
}

public class DocumentManager
{
    // Before C# 14: Defensive programming nightmare
    public void UpdateDocumentMetadata(Document? doc, Metadata metadata)
    {
        if (doc != null)
        {
            doc.Metadata = metadata;
            if (doc.Metadata != null)
            {
                doc.Metadata.LastModified = DateTime.UtcNow;
            }
        }
    }

    // C# 14: Concise and safe
    public void UpdateDocumentMetadataModern(Document? doc, Metadata metadata)
    {
        doc?.Metadata = metadata;  // Only assigns if doc is not null
        doc?.Metadata?.LastModified = DateTime.UtcNow;

        // Works with compound assignments too
        doc?.PageCount += 1;
        doc?.Tags?.Add("processed");
    }
}

// In your source file
public partial class DocumentProcessor
{
    public partial DocumentProcessor(ILogger logger);
    public partial event EventHandler<DocumentEventArgs> DocumentProcessed;
}

// Generated by source generator
public partial class DocumentProcessor
{
    private readonly ILogger _logger;

    public partial DocumentProcessor(ILogger logger)
    {
        _logger = logger;
        InitializeTelemetry();
        RegisterMetrics();
    }

    public partial event EventHandler<DocumentEventArgs> DocumentProcessed
    {
        add { /* Generated telemetry code */ }
        remove { /* Generated cleanup code */ }
    }
}

<!-- Before .NET 10: Multiple round trips -->
<script src="_framework/blazor.webassembly.js"></script>
<!-- Then loads blazor.boot.json -->
<!-- Then loads assemblies sequentially -->

<!-- .NET 10: Optimized pipeline -->
<script src="_framework/blazor.webassembly#[.{fingerprint}].js"></script>
<!-- Everything loads in parallel -->

<Project Sdk="Microsoft.NET.Sdk.BlazorWebAssembly">
  <PropertyGroup>
    <TargetFramework>net10.0</TargetFramework>
    <OverrideHtmlAssetPlaceholders>true</OverrideHtmlAssetPlaceholders>
  </PropertyGroup>

  <!-- Custom fingerprinting patterns -->
  <ItemGroup>
    <StaticWebAssetFingerprintPattern 
      Include="DocumentProcessing" 
      Pattern="*.mjs" 
      Expression="#[.{fingerprint}]!" />
  </ItemGroup>
</Project>

@page "/"
@implements IDisposable

<HeadContent>
    @* Automatic preloading in .NET 10 *@
    <link rel="preload" href="_framework/dotnet.native.wasm" as="fetch" crossorigin />
    <link rel="preload" href="_framework/System.Private.CoreLib.dll" as="fetch" crossorigin />
</HeadContent>

@code {
    protected override async Task OnInitializedAsync()
    {
        // Resources already downloading in parallel
        // Component initialization is no longer blocked
        await LoadDocumentProcessingEngine();
    }
}

<PropertyGroup>
  <!-- Enable comprehensive performance tracking -->
  <WasmPerfTracing>true</WasmPerfTracing>
  <WasmEnableThreads>true</WasmEnableThreads>
  <WasmEnableSIMD>true</WasmEnableSIMD>
</PropertyGroup>

public class Document
{
    public int Id { get; set; }
    public string Title { get; set; }

    // Complex type - stored as JSON in database
    [ComplexType]
    public DocumentMetadata Metadata { get; set; }
}

[ComplexType]
public class DocumentMetadata
{
    public List<string> Tags { get; set; }
    public Dictionary<string, object> CustomFields { get; set; }
    public ProcessingStatus Status { get; set; }
}

// Fluent configuration
modelBuilder.Entity<Document>()
    .OwnsOne(d => d.Metadata, metadata =>
    {
        metadata.ToJson();
        metadata.OwnsMany(m => m.Tags);
    });

var documentsWithOptionalMetadata = 
    from doc in context.Documents
    join meta in context.Metadata
        on doc.Id equals meta.DocumentId into metaGroup
    from m in metaGroup.DefaultIfEmpty()  // LEFT JOIN
    select new
    {
        Document = doc,
        Metadata = m ?? new Metadata { Status = "Unprocessed" }
    };

using Microsoft.AgentFramework;

public class DocumentIntelligenceAgent : Agent
{
    private readonly IDocumentProcessor _processor;
    private readonly IVectorStore _vectorStore;

    protected override async Task<AgentResponse> ProcessAsync(AgentRequest request)
    {
        // Extract document understanding
        var embedding = await _vectorStore.CreateEmbedding(request.Document);

        // Semantic search across enterprise documents
        var similarDocuments = await _vectorStore.Search(embedding, topK: 5);

        // Generate insights using LLM
        return await GenerateInsights(request, similarDocuments);
    }
}

// Orchestration patterns built-in
public class DocumentWorkflow : Workflow
{
    public override void Configure()
    {
        // Sequential processing
        AddStep<ExtractTextAgent>();
        AddStep<ClassifyDocumentAgent>();

        // Parallel analysis
        AddParallel(
            new AnalyzeContentAgent(),
            new ExtractMetadataAgent(),
            new GenerateEmbeddingsAgent()
        );

        // Conditional routing
        AddConditional<RouteByDocumentType>()
            .When(DocType.Invoice, new InvoiceProcessor())
            .When(DocType.Contract, new ContractAnalyzer())
            .Default(new GenericProcessor());
    }
}

// Run .NET without Blazor UI framework
[JSExport]
public static class PureWasmProcessor
{
    public static string ProcessData(string input)
    {
        // This runs in WASM without any UI framework
        // Pure computational logic in the browser
        using var crypto = SHA256.Create();
        var hash = crypto.ComputeHash(Encoding.UTF8.GetBytes(input));
        return Convert.ToBase64String(hash);
    }
}

// JavaScript can call this directly
// const result = await DotNet.invokeMethodAsync('ProcessData', userData);

// WASI-compatible code
[WasmHost("wasi")]
public class EdgeProcessor
{
    [Export("process")]
    public static int ProcessEdgeData(int input)
    {
        // Runs on edge nodes, IoT devices, or serverless platforms
        // No browser, no server - pure WASM runtime
        return PerformComplexCalculation(input);
    }
}

// Shared domain model
public interface IDocumentProcessor
{
    Task<ProcessedDocument> ProcessAsync(RawDocument doc);
}

// Server implementation (runs in traditional .NET runtime)
public class ServerDocumentProcessor : IDocumentProcessor
{
    public async Task<ProcessedDocument> ProcessAsync(RawDocument doc)
    {
        // Heavy processing, database access, file I/O
        await using var connection = new SqlConnection(connectionString);
        // Server-specific implementation
    }
}

// WASM implementation (runs in browser/edge)
public class WasmDocumentProcessor : IDocumentProcessor
{
    public async Task<ProcessedDocument> ProcessAsync(RawDocument doc)
    {
        // Client-side processing, offline capability
        // No database access, pure computation
        return await Task.Run(() => ProcessLocally(doc));
    }
}

// Runtime selection
public static IDocumentProcessor GetProcessor()
{
    return RuntimeInformation.IsOSPlatform(OSPlatform.Browser)
        ? new WasmDocumentProcessor()
        : new ServerDocumentProcessor();
}

<!-- MainPage.xaml in .NET MAUI -->
<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui">
    <BlazorWebView HostPage="wwwroot/index.html">
        <BlazorWebView.RootComponents>
            <RootComponent Selector="#app" 
                          ComponentType="{x:Type local:DocumentEditor}" />
        </BlazorWebView.RootComponents>
    </BlazorWebView>
</ContentPage>

// DocumentEditor.razor - runs in WASM inside native app
@page "/editor"
@using IronSoftware.Documents

<div class="editor-container">
    @if (IsWasmRuntime)
    {
        <p>Running in WebAssembly inside @(DeviceInfo.Platform)</p>
    }
    <DocumentCanvas @ref="canvas" />
</div>

@code {
    private bool IsWasmRuntime => OperatingSystem.IsBrowser();

    protected override async Task OnInitializedAsync()
    {
        // This Blazor component runs in WASM
        // But is hosted inside a native iOS/Android app
        await LoadWasmOptimizedLibraries();
    }
}

// document-processor.tsp
import "@typespec/http";

@service({
  title: "Document Processing Service",
})
namespace IronSoftware.DocumentProcessor;

model Document {
  id: string;
  content: bytes;
  mimeType: string;
}

@route("/process")
interface DocumentOperations {
  @post
  processDocument(@body doc: Document): ProcessingResult;
}

[WebAssemblyExport]
public static class DocumentProcessorWasm
{
    [JSExport]
    public static byte[] ProcessPdf(byte[] pdfData)
    {
        // Runs in WASM, callable from any language
        using var document = PdfDocument.Load(pdfData);

        // Complex processing logic
        var processed = ApplyEnterpriseProcessing(document);

        return processed.ToByteArray();
    }
}

public interface IWasmBridge
{
    ValueTask<Memory<byte>> ProcessLargeDocument(ReadOnlyMemory<byte> input);
}

public class OptimizedWasmBridge : IWasmBridge
{
    private readonly IMemoryPool<byte> _memoryPool;

    public async ValueTask<Memory<byte>> ProcessLargeDocument(
        ReadOnlyMemory<byte> input)
    {
        // Zero-copy transfer to WASM
        using var lease = _memoryPool.Rent(input.Length);

        // Process in WASM without marshalling
        var result = await WasmRuntime.InvokeAsync<byte[]>(
            "processDocument", 
            input.Span);

        return new Memory<byte>(result);
    }
}

# Complete migration readiness check
dotnet tool install -g upgrade-assistant
dotnet tool install -g dotnet-outdated
dotnet tool install -g dotnet-depends

# Analyze your solution
upgrade-assistant analyze .YourSolution.sln --target-tfm net10.0
dotnet outdated .YourSolution.sln
dotnet depends analyze .YourSolution.sln

# Generate migration report
upgrade-assistant analyze .YourSolution.sln --report migration-report.html

<!-- Check all package references for .NET 10 compatibility -->
<PackageReference Include="IronPdf" Version="2024.11.*" />
<!-- ✅ Compatible -->

<PackageReference Include="OldLibrary" Version="1.0.0" />
<!-- ❌ Needs update or replacement -->

// Identify deprecated patterns
#pragma warning disable SYSLIB0011 // Type or member is obsolete
BinaryFormatter formatter = new(); // Must be replaced
#pragma warning restore SYSLIB0011

// Replace with System.Text.Json
var options = new JsonSerializerOptions 
{ 
    TypeInfoResolver = MyContext.Default 
};

// global.json
{
  "sdk": {
    "version": "10.0.100",
    "rollForward": "latestFeature"
  }
}

<!-- Directory.Build.props -->
<Project>
  <PropertyGroup>
    <TargetFramework>net10.0</TargetFramework>
    <LangVersion>14.0</LangVersion>
    <Nullable>enable</Nullable>
    <ImplicitUsings>enable</ImplicitUsings>
    <!-- Enable new performance features -->
    <TieredCompilation>true</TieredCompilation>
    <PublishReadyToRun>true</PublishReadyToRun>
  </PropertyGroup>
</Project>

# Before
FROM mcr.microsoft.com/dotnet/aspnet:8.0

# After
FROM mcr.microsoft.com/dotnet/aspnet:10.0-alpine
# Alpine images are 50% smaller with .NET 10

// Systematic refactoring approach
public class RefactoringStrategy
{
    // Step 1: Convert backing fields to field keyword
    // Before:
    private string _name;
    public string Name 
    { 
        get => _name; 
        set => _name = value ?? throw new ArgumentNullException(); 
    }

    // After:
    public string Name 
    { 
        get; 
        set => field = value ?? throw new ArgumentNullException(); 
    }

    // Step 2: Implement extension properties
    // Before: Extension methods only
    public static class Extensions
    {
        public static bool GetIsEmpty<T>(this IEnumerable<T> source)
            => !source.Any();
    }

    // After: Extension properties
    extension<T>(IEnumerable<T> source)
    {
        public bool IsEmpty => !source.Any();
    }

    // Step 3: Use null-conditional assignments
    // Before:
    if (customer != null)
    {
        customer.LastUpdated = DateTime.UtcNow;
        if (customer.Orders != null)
        {
            customer.Orders.Clear();
        }
    }

    // After:
    customer?.LastUpdated = DateTime.UtcNow;
    customer?.Orders?.Clear();
}

<!-- Enable all .NET 10 WASM optimizations -->
<PropertyGroup>
  <!-- Compilation optimizations -->
  <RunAOTCompilation>true</RunAOTCompilation>
  <WasmNativeStrip>true</WasmNativeStrip>
  <InvariantGlobalization>true</InvariantGlobalization>

  <!-- Asset optimizations -->
  <OverrideHtmlAssetPlaceholders>true</OverrideHtmlAssetPlaceholders>
  <WasmEnableThreads>true</WasmEnableThreads>
  <WasmEnableSIMD>true</WasmEnableSIMD>

  <!-- Bundle size optimizations -->
  <BlazorWebAssemblyPreserveCollationData>false</BlazorWebAssemblyPreserveCollationData>
  <PublishTrimmed>true</PublishTrimmed>
  <TrimMode>link</TrimMode>
</PropertyGroup>

// Leverage new complex types for document metadata
modelBuilder.Entity<Document>()
    .ComplexProperty(d => d.Metadata, metadata =>
    {
        metadata.IsRequired();
        metadata.Property(m => m.CreatedDate);
        metadata.Property(m => m.Tags).HasConversion(
            v => JsonSerializer.Serialize(v, (JsonSerializerOptions)null),
            v => JsonSerializer.Deserialize<List<string>>(v, (JsonSerializerOptions)null));
    });

// Use new Left/Right join support
var query = context.Documents
    .LeftJoin(context.Revisions,
        d => d.Id,
        r => r.DocumentId,
        (doc, rev) => new { Document = doc, Revision = rev })
    .Where(x => x.Revision == null); // Documents without revisions

// Implement startup warmup for JIT optimization
public class WarmupService : BackgroundService
{
    protected override async Task ExecuteAsync(CancellationToken stoppingToken)
    {
        // Force JIT compilation of critical paths
        await Task.Run(() =>
        {
            // Warm up document processing pipeline
            for (int i = 0; i < 1000; i++)
            {
                ProcessDummyDocument();
            }

            // Warm up serialization
            JsonSerializer.Serialize(new SampleDocument());

            // Warm up regex patterns
            DocumentValidator.CompilePatterns();
        });
    }
}

// Configure memory pools for document processing
services.Configure<MemoryPoolOptions>(options =>
{
    options.MaximumRetainedCapacity = 100_000_000;
    options.BlockSize = 4096;
});

services.Configure<GCLatencyMode>(options =>
{
    options = GCLatencyMode.SustainedLowLatency;
});

// Before: .NET-specific
public class DocumentProcessor
{
    public byte[] ProcessPdf(string path)
    {
        using var fs = File.OpenRead(path);
        // Platform-specific I/O
    }
}

// After: WebAssembly-ready
[WebAssemblyExport]
public class UniversalProcessor
{
    [JSExport]
    public byte[] ProcessPdf(byte[] data)
    {
        // Pure computation, no I/O
        // Runs anywhere WASM runs
    }
}

using System.Security.Cryptography;

public class QuantumResistantSecurity
{
    public byte[] SignDocument(byte[] document)
    {
        // ML-DSA: NIST-approved quantum-resistant algorithm
        using var mlDsa = MLDsa.Create(MLDsaParameters.ML_DSA_87);
        return mlDsa.SignData(document, HashAlgorithmName.SHA512);
    }

    public byte[] SecureKeyWrap(byte[] key, byte[] kek)
    {
        // AES KeyWrap with Padding - quantum-resistant key management
        using var aes = Aes.Create();
        aes.Key = kek;

        return AesKeyWrap.WrapKey(key, aes, AesKeyWrapPadding.Enabled);
    }
}

// From Jeff's stream: "Making WebAssembly Real"
public class FritzApproach : ITeachingMethodology
{
    public void TeachConcept(string concept)
    {
        // Jeff's philosophy: practical over theoretical
        LiveCode(concept);
        ShowRealWorldExample();
        AnswerCommunityQuestions();
        OpenSourceTheResult();
    }
}

## Community Contributions (First Month of .NET 10)
- Blazor: 847 pull requests merged
- Runtime (WASM): 423 contributions
- Tooling: 1,256 improvements
- Documentation: 3,000+ edits
- Sample Projects: 500+ new examples

<!-- Production-ready .csproj configuration -->
<Project Sdk="Microsoft.NET.Sdk.BlazorWebAssembly">
  <PropertyGroup>
    <TargetFramework>net10.0</TargetFramework>

    <!-- Critical: Proper fingerprinting setup -->
    <OverrideHtmlAssetPlaceholders>true</OverrideHtmlAssetPlaceholders>

    <!-- Performance optimizations -->
    <RunAOTCompilation>true</RunAOTCompilation>
    <WasmNativeStrip>true</WasmNativeStrip>
    <WasmEnableThreads>true</WasmEnableThreads>
    <WasmEnableSIMD>true</WasmEnableSIMD>

    <!-- Bundle size optimization -->
    <PublishTrimmed>true</PublishTrimmed>
    <TrimMode>full</TrimMode>
    <IlcGenerateStackTraceData>false</IlcGenerateStackTraceData>

    <!-- Security -->
    <BlazorEnableTimeZoneSupport>false</BlazorEnableTimeZoneSupport>
    <InvariantGlobalization>true</InvariantGlobalization>
  </PropertyGroup>

  <!-- Conditional compilation for WASM vs Server -->
  <PropertyGroup Condition="'$(Configuration)' == 'Release'">
    <DefineConstants>RELEASE;WASM_PRODUCTION</DefineConstants>
  </PropertyGroup>
</Project>

public class EnterpriseJitWarmupService : IHostedService
{
    private readonly ILogger<EnterpriseJitWarmupService> _logger;
    private readonly IMemoryCache _cache;

    public async Task StartAsync(CancellationToken cancellationToken)
    {
        _logger.LogInformation("Starting JIT warmup for critical paths");

        // Parallel warmup for multi-core systems
        var warmupTasks = new[]
        {
            WarmupDocumentProcessing(),
            WarmupSerialization(),
            WarmupCryptography(),
            WarmupRegexPatterns(),
            WarmupVectorOperations()
        };

        await Task.WhenAll(warmupTasks);

        // Force Tier 1 JIT compilation
        await ForceJitTierPromotion();

        _logger.LogInformation($"JIT warmup completed. Memory: {GC.GetTotalMemory(false):N0} bytes");
    }

    private async Task WarmupDocumentProcessing()
    {
        await Task.Run(() =>
        {
            var sw = Stopwatch.StartNew();

            // Process dummy documents to trigger JIT
            for (int i = 0; i < 10_000; i++)
            {
                using var doc = new PdfDocument();
                doc.AddPage();
                doc.RenderToBytes();
            }

            _logger.LogInformation($"Document processing warmup: {sw.ElapsedMilliseconds}ms");
        });
    }

    private async Task ForceJitTierPromotion()
    {
        // Force methods to Tier 1 optimization
        RuntimeHelpers.PrepareMethod(
            typeof(DocumentProcessor).GetMethod(nameof(DocumentProcessor.ProcessAsync))!.MethodHandle);
    }
}

// Startup configuration for high-throughput document processing
public class DocumentProcessingConfiguration
{
    public static void ConfigureServices(IServiceCollection services)
    {
        // Configure array pools for document buffers
        services.AddSingleton<ArrayPool<byte>>(sp =>
        {
            return ArrayPool<byte>.Create(
                maxArrayLength: 50 * 1024 * 1024, // 50MB max document
                maxArraysPerBucket: 50); // Cache up to 50 buffers
        });

        // Configure memory cache for processed documents
        services.AddMemoryCache(options =>
        {
            options.SizeLimit = 1_000_000_000; // 1GB cache
            options.CompactionPercentage = 0.25;
            options.ExpirationScanFrequency = TimeSpan.FromMinutes(5);
        });

        // Configure GC for low-latency document processing
        services.Configure<GCSettings>(options =>
        {
            GCSettings.LatencyMode = GCLatencyMode.SustainedLowLatency;
            GCSettings.LargeObjectHeapCompactionMode = GCLargeObjectHeapCompactionMode.CompactOnce;
        });
    }
}

<!-- index.html optimizations for Blazor WASM -->
<!DOCTYPE html>
<html>
<head>
    <!-- Preconnect to CDN endpoints -->
    <link rel="preconnect" href="https://cdn.ironsoftware.com">
    <link rel="dns-prefetch" href="https://api.ironsoftware.com">

    <!-- Preload critical WASM assets -->
    <link rel="preload" href="_framework/dotnet.native.wasm" as="fetch" crossorigin="anonymous">
    <link rel="preload" href="_framework/dotnet.runtime.js" as="script">

    <!-- Module preloading with fingerprinting -->
    <link rel="modulepreload" href="_framework/blazor.webassembly#[.{fingerprint}].js">

    <!-- Progressive enhancement -->
    <script>
        // Check WASM support before loading
        if (typeof WebAssembly === "undefined") {
            document.location = "/unsupported-browser";
        }
    </script>
</head>
<body>
    <!-- Loading indicator with skeleton UI -->
    <div id="app">
        <div class="skeleton-loader">
            <div class="progress-bar"></div>
            <p>Loading Iron Software Document Processor...</p>
        </div>
    </div>

    <!-- Deferred script loading -->
    <script src="_framework/blazor.webassembly#[.{fingerprint}].js" defer></script>

    <!-- Telemetry for load performance -->
    <script>
        window.addEventListener('load', () => {
            performance.mark('blazor-load-start');
        });

        Blazor.start({
            loadBootResource: function (type, name, defaultUri, integrity) {
                // Custom resource loading with CDN fallback
                const cdnUri = `https://cdn.ironsoftware.com/blazor/${name}`;
                return fetch(cdnUri)
                    .catch(() => fetch(defaultUri));
            }
        }).then(() => {
            performance.mark('blazor-load-end');
            performance.measure('blazor-load', 'blazor-load-start', 'blazor-load-end');

            // Send telemetry
            const loadTime = performance.getEntriesByName('blazor-load')[0];
            console.log(`Blazor loaded in ${loadTime.duration}ms`);
        });
    </script>
</body>
</html>

// Comprehensive diagnostics configuration
public class ProductionDiagnostics
{
    public static void Configure(WebApplicationBuilder builder)
    {
        // Enable all .NET 10 diagnostics
        builder.Services.AddApplicationInsightsTelemetry();

        // Custom metrics for document processing
        builder.Services.AddSingleton<IMetrics>(sp =>
        {
            var meterProvider = Sdk.CreateMeterProviderBuilder()
                .AddMeter("IronSoftware.Documents")
                .AddPrometheusExporter()
                .AddOtlpExporter(options =>
                {
                    options.Endpoint = new Uri("https://telemetry.ironsoftware.com");
                })
                .Build();

            return new DocumentMetrics(meterProvider);
        });

        // WASM-specific diagnostics
        if (OperatingSystem.IsBrowser())
        {
            builder.Services.Configure<WasmDiagnosticOptions>(options =>
            {
                options.EnablePerfTracing = true;
                options.EnableMemoryProfiling = true;
                options.ProfilerSampleRate = 1000; // Sample every 1000ms
            });
        }
    }
}

// Custom metrics implementation
public class DocumentMetrics : IMetrics
{
    private readonly Counter<long> _documentsProcessed;
    private readonly Histogram<double> _processingDuration;
    private readonly Gauge<int> _activeDocuments;

    public DocumentMetrics(MeterProvider provider)
    {
        var meter = new Meter("IronSoftware.Documents", "1.0");

        _documentsProcessed = meter.CreateCounter<long>(
            "documents.processed",
            "documents",
            "Total number of documents processed");

        _processingDuration = meter.CreateHistogram<double>(
            "documents.processing.duration",
            "milliseconds",
            "Document processing duration");

        _activeDocuments = meter.CreateGauge<int>(
            "documents.active",
            "documents",
            "Currently processing documents");
    }

    public void RecordProcessed(string documentType, double durationMs)
    {
        _documentsProcessed.Add(1, new KeyValuePair<string, object>("type", documentType));
        _processingDuration.Record(durationMs);
    }
}

# Azure DevOps Pipeline for .NET 10 WASM deployment
trigger:
  branches:
    include:
    - main
    - release/*

variables:
  buildConfiguration: 'Release'
  dotnetVersion: '10.0.x'

stages:
- stage: Build
  jobs:
  - job: BuildWasm
    pool:
      vmImage: 'ubuntu-latest'
    steps:
    - task: UseDotNet@2
      inputs:
        version: $(dotnetVersion)

    - script: |
        # Build with AOT and all optimizations
        dotnet publish -c Release 
          -p:RunAOTCompilation=true 
          -p:WasmNativeStrip=true 
          -p:PublishTrimmed=true 
          -o $(Build.ArtifactStagingDirectory)/wasm
      displayName: 'Build WASM with AOT'

    - script: |
        # Generate integrity hashes for all assets
        find $(Build.ArtifactStagingDirectory)/wasm/_framework 
          -type f -exec sha384sum {} ; > integrity.txt
      displayName: 'Generate integrity hashes'

    - task: PublishBuildArtifacts@1

- stage: Deploy
  jobs:
  - deployment: DeployToProduction
    environment: 'production'
    strategy:
      runOnce:
        deploy:
          steps:
          - script: |
              # Blue-green deployment to CDN
              az storage blob upload-batch 
                --source $(Pipeline.Workspace)/wasm 
                --destination '$web' 
                --account-name ironsoftwarecdn 
                --destination-path "blazor/$(Build.BuildId)"

              # Update CDN routing rules for gradual rollout
              az cdn endpoint rule add 
                --name blazor-endpoint 
                --profile-name iron-cdn 
                --resource-group iron-rg 
                --order 1 
                --rule-name "canary-$(Build.BuildId)" 
                --match-variable RequestHeader 
                --match-values "X-Canary=true" 
                --action-name URLRewrite 
                --destination "/blazor/$(Build.BuildId)"
            displayName: 'Deploy to CDN with canary'

// Common issue resolutions
public static class ProductionTroubleshooting
{
    // Issue 1: WASM fingerprinting conflicts
    public static void FixFingerprintingIssues(WebApplicationBuilder builder)
    {
        // Disable automatic fingerprinting if using custom CDN
        builder.Services.Configure<StaticWebAssetsOptions>(options =>
        {
            options.ManifestPath = "custom-manifest.json";
        });
    }

    // Issue 2: Memory leaks in long-running WASM apps
    public static void PreventMemoryLeaks()
    {
        // Implement aggressive disposal patterns
        public sealed class DocumentViewer : IAsyncDisposable
        {
            private readonly SemaphoreSlim _semaphore = new(1, 1);
            private readonly List<IDisposable> _disposables = new();

            public async ValueTask DisposeAsync()
            {
                await _semaphore.WaitAsync();
                try
                {
                    foreach (var disposable in _disposables)
                    {
                        disposable?.Dispose();
                    }
                    _disposables.Clear();

                    // Force garbage collection in WASM
                    if (OperatingSystem.IsBrowser())
                    {
                        GC.Collect();
                        GC.WaitForPendingFinalizers();
                        GC.Collect();
                    }
                }
                finally
                {
                    _semaphore?.Dispose();
                }
            }
        }
    }

    // Issue 3: Slow initial load
    public static void OptimizeInitialLoad(IApplicationBuilder app)
    {
        app.UseCompressedStaticFiles(new CompressedStaticFileOptions
        {
            // Serve pre-compressed Brotli files
            EnableBrotli = true,
            BrotliCompressionLevel = 11,

            // Cache for 1 year with revalidation
            CacheControl = "public, max-age=31536000, must-revalidate"
        });
    }
}

// Shared interface across all runtimes
public interface IDocumentPipeline
{
    Task<ProcessedDocument> ProcessAsync(RawDocument document);
    bool CanProcessLocally { get; }
}

// Server implementation - heavy lifting
public class ServerDocumentPipeline : IDocumentPipeline
{
    private readonly IDbContext _db;
    private readonly IS3Storage _storage;

    public bool CanProcessLocally => true;

    public async Task<ProcessedDocument> ProcessAsync(RawDocument document)
    {
        // OCR processing (server-only due to ML models)
        var ocrResult = await PerformOCR(document);

        // Database persistence
        await _db.Documents.AddAsync(ocrResult);

        // S3 storage for large files
        await _storage.UploadAsync(ocrResult.Content);

        return ocrResult;
    }
}

// WASM implementation - client-side processing
[WebAssemblyExport]
public class WasmDocumentPipeline : IDocumentPipeline
{
    public bool CanProcessLocally => !RequiresServerResources();

    public async Task<ProcessedDocument> ProcessAsync(RawDocument document)
    {
        // Text extraction (can run in browser)
        var text = await ExtractTextAsync(document);

        // Client-side validation
        var validation = ValidateDocument(text);

        // Basic transformations
        var processed = ApplyTransformations(document);

        // If needs server processing, delegate
        if (RequiresOCR(document))
        {
            return await DelegateToServer(document);
        }

        return processed;
    }
}

// Runtime factory pattern
public class DocumentPipelineFactory
{
    public static IDocumentPipeline Create()
    {
        if (OperatingSystem.IsBrowser())
        {
            return new WasmDocumentPipeline();
        }
        else if (RuntimeInformation.IsOSPlatform(OSPlatform.Create("WASI")))
        {
            return new EdgeDocumentPipeline();
        }
        else
        {
            return new ServerDocumentPipeline();
        }
    }
}

// Blazor component with progressive enhancement
@page "/document-editor"
@implements IAsyncDisposable

<div class="editor-container">
    @if (!IsWasmLoaded)
    {
        <!-- Server-side fallback -->
        <ServerSideEditor Document="@CurrentDocument" />
    }
    else
    {
        <!-- Full WASM editor -->
        <WasmEditor @ref="wasmEditor" Document="@CurrentDocument" />
    }
</div>

@code {
    private bool IsWasmLoaded = false;
    private WasmEditor? wasmEditor;

    protected override async Task OnAfterRenderAsync(bool firstRender)
    {
        if (firstRender)
        {
            // Progressive enhancement: load WASM in background
            IsWasmLoaded = await TryLoadWasmEditor();

            if (IsWasmLoaded)
            {
                // Seamlessly transition to WASM version
                StateHasChanged();
            }
        }
    }

    private async Task<bool> TryLoadWasmEditor()
    {
        try
        {
            // Check if WASM is supported and performant
            if (!OperatingSystem.IsBrowser())
                return false;

            // Measure connection speed
            var speed = await MeasureConnectionSpeed();
            if (speed < 1_000_000) // Less than 1 Mbps
                return false;

            // Load WASM modules dynamically
            await JSRuntime.InvokeVoidAsync("import", "./_framework/editor.wasm.js");

            return true;
        }
        catch
        {
            // Fallback to server-side
            return false;
        }
    }
}

// service-worker.published.js
self.addEventListener('install', event => {
    event.waitUntil(
        caches.open('blazor-offline-v1').then(cache => {
            return cache.addAll([
                '/',
                '/_framework/blazor.webassembly.js',
                '/_framework/dotnet.wasm',
                '/_framework/blazor.boot.json',
                // Cache all DLLs for offline use
                '/_framework/IronSoftware.Documents.dll',
                '/_framework/System.Private.CoreLib.dll'
            ]);
        })
    );
});

self.addEventListener('fetch', event => {
    event.respondWith(
        // Network first, fallback to cache
        fetch(event.request)
            .then(response => {
                // Update cache with fresh content
                if (response.ok) {
                    const responseClone = response.clone();
                    caches.open('blazor-offline-v1').then(cache => {
                        cache.put(event.request, responseClone);
                    });
                }
                return response;
            })
            .catch(() => {
                // Offline: serve from cache
                return caches.match(event.request);
            })
    );
});

// Blazor component with offline support
public class OfflineDocumentManager : ComponentBase
{
    [Inject] private IJSRuntime JS { get; set; }
    [Inject] private ILocalStorage LocalStorage { get; set; }

    private readonly Queue<DocumentOperation> _offlineQueue = new();

    protected override async Task OnInitializedAsync()
    {
        // Check online status
        var isOnline = await JS.InvokeAsync<bool>("navigator.onLine");

        if (!isOnline)
        {
            await LoadOfflineMode();
        }

        // Listen for online/offline events
        await JS.InvokeVoidAsync("addOnlineListener", 
            DotNetObjectReference.Create(this));
    }

    [JSInvokable]
    public async Task OnConnectionRestored()
    {
        // Sync offline changes
        while (_offlineQueue.TryDequeue(out var operation))
        {
            await SyncOperation(operation);
        }
    }

    public async Task SaveDocument(Document doc)
    {
        if (await IsOnline())
        {
            await SaveToServer(doc);
        }
        else
        {
            // Save locally and queue for sync
            await LocalStorage.SetItemAsync($"doc_{doc.Id}", doc);
            _offlineQueue.Enqueue(new SaveOperation(doc));
        }
    }
}

<!-- Host page with multiple WASM islands -->
<!DOCTYPE html>
<html>
<body>
    <!-- Header - Server-rendered -->
    <header>
        @Html.Partial("_Header")
    </header>

    <!-- Document viewer - WASM island 1 -->
    <div id="document-viewer">
        <script src="/_apps/viewer/blazor.webassembly.js"></script>
    </div>

    <!-- Analytics dashboard - WASM island 2 -->
    <div id="analytics">
        <script src="/_apps/analytics/blazor.webassembly.js"></script>
    </div>

    <!-- Editor - WASM island 3 -->
    <div id="editor">
        <script src="/_apps/editor/blazor.webassembly.js"></script>
    </div>

    <!-- Inter-island communication -->
    <script>
        // Custom event bus for WASM islands
        class WasmEventBus {
            constructor() {
                this.listeners = {};
            }

            emit(event, data) {
                // Broadcast to all WASM islands
                document.querySelectorAll('[data-wasm-island]').forEach(island => {
                    island.contentWindow.postMessage({
                        type: event,
                        data: data
                    }, '*');
                });
            }

            on(event, handler) {
                window.addEventListener('message', (e) => {
                    if (e.data.type === event) {
                        handler(e.data.data);
                    }
                });
            }
        }

        window.wasmBus = new WasmEventBus();
    </script>
</body>
</html>

// Shared communication interface for WASM islands
public interface IWasmIsland
{
    string IslandId { get; }
    Task InitializeAsync();
    Task<object> HandleMessage(IslandMessage message);
}

// Document viewer island
[WebAssemblyIsland("document-viewer")]
public class DocumentViewerIsland : IWasmIsland
{
    public string IslandId => "document-viewer";

    [JSInvokable]
    public async Task<object> HandleMessage(IslandMessage message)
    {
        return message.Type switch
        {
            "load-document" => await LoadDocument(message.Data),
            "export-pdf" => await ExportToPdf(),
            _ => null
        };
    }
}

// Analytics island
[WebAssemblyIsland("analytics")]
public class AnalyticsIsland : IWasmIsland
{
    public string IslandId => "analytics";

    [JSInvokable]
    public async Task<object> HandleMessage(IslandMessage message)
    {
        return message.Type switch
        {
            "update-metrics" => await UpdateMetrics(message.Data),
            "generate-report" => await GenerateReport(),
            _ => null
        };
    }
}

// WASI-compatible edge function
[WasiExport]
public class EdgeImageProcessor
{
    [Export("process_image")]
    public static unsafe int ProcessImage(byte* input, int inputLen, byte* output, int* outputLen)
    {
        try
        {
            // Convert pointers to managed arrays
            var inputArray = new Span<byte>(input, inputLen).ToArray();

            // Process image at edge location
            var processed = ResizeImage(inputArray, 800, 600);
            var compressed = CompressImage(processed, 85);

            // Copy to output buffer
            if (compressed.Length > *outputLen)
                return -1; // Buffer too small

            compressed.CopyTo(new Span<byte>(output, *outputLen));
            *outputLen = compressed.Length;

            return 0; // Success
        }
        catch
        {
            return -2; // Processing error
        }
    }

    private static byte[] ResizeImage(byte[] input, int width, int height)
    {
        // Pure computational image resizing
        // No file I/O, runs in WASI sandbox
        using var image = Image.Load(input);
        image.Mutate(x => x.Resize(width, height));

        using var ms = new MemoryStream();
        image.SaveAsJpeg(ms);
        return ms.ToArray();
    }
}

// Deploy to Cloudflare Workers
// wrangler.toml
/*
name = "iron-image-processor"
type = "rust"
workers_dev = true
compatibility_date = "2025-11-01"

[build]
command = "dotnet publish -c Release -r wasi-wasm"

[[wasm_modules]]
source = "./bin/Release/net10.0/wasi-wasm/native/IronProcessor.wasm"
*/

// Discriminated unions (finally!)
public union Result<T>
{
    Success(T value),
    Error(string message)
}

// Primary interfaces
public interface IPrimaryInterface(string name, int id);

// Async streams with cancellation
await foreach (var item in GetDataAsync() with { MaxItems = 100, Timeout = 30s })
{
    Process(item);
}

graph LR
    A[Traditional Architecture] --> B[JavaScript Team]
    A --> C[.NET Team]
    A --> D[API Translation Layer]

    E[.NET 10 Architecture] --> F[Unified .NET Team]
    E --> G[Shared Business Logic]
    E --> H[Choose Runtime: Server/WASM/Edge]

// Future: Every method can be AI-augmented
[AIAugmented]
public class IntelligentDocumentProcessor
{
    [AIMethod("Extract key information from unstructured documents")]
    public async Task<DocumentInsights> AnalyzeAsync(Document doc)
    {
        // Framework automatically:
        // 1. Attempts traditional parsing
        // 2. Falls back to LLM if needed
        // 3. Learns from corrections
        // 4. Improves over time
    }
}

public class RiskMitigationStrategy
{
    // Progressive enhancement pattern
    public async Task<IComponent> LoadComponentAsync()
    {
        try
        {
            // Try WASM first
            if (await CanLoadWasm())
                return new WasmComponent();
        }
        catch (NotSupportedException)
        {
            // Log telemetry
        }

        // Fallback to server
        return new ServerComponent();
    }

    // Feature detection
    private async Task<bool> CanLoadWasm()
    {
        var memory = await GetAvailableMemory();
        var bandwidth = await MeasureBandwidth();

        return memory > 512_000_000 && // 512MB
               bandwidth > 1_000_000;   // 1 Mbps
    }
}

# Recommended training path for teams
training_roadmap:
  month_1:
    - C# 14 language features
    - Blazor WebAssembly basics
    - WASM conceptual overview

  month_2:
    - Advanced Blazor patterns
    - Performance optimization
    - Debugging WASM applications

  month_3:
    - WASI and edge computing
    - Hybrid architectures
    - Production deployment

  month_4:
    - Agent Framework
    - AI integration patterns
    - Advanced diagnostics

┌─────────────────────────────────────┐
│          .NET Universal             │
├─────────────────────────────────────┤
│  Languages: C#, F#, VB, Python*     │
├─────────────────────────────────────┤
│  Runtimes:                          │
│  • CLR (traditional server)         │
│  • CoreCLR (cross-platform)        │
│  • Mono (mobile/embedded)          │
│  • WASM (browser/edge)             │
│  • WASI (universal)                │
├─────────────────────────────────────┤
│  Targets:                           │
│  • Cloud (Azure, AWS, GCP)         │
│  • Edge (CDN, 5G, IoT)            │
│  • Browser (all modern)            │
│  • Mobile (iOS, Android)           │
│  • Desktop (Windows, Mac, Linux)   │
│  • Embedded (IoT, automotive)      │
│  • Quantum (coming)                │
└─────────────────────────────────────┘