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DependencyPropertyGenerator
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‎Demo/2026/DependencyPropertyGenerator/ClassLibrary1.slnx‎

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<Solution>
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<Project Path="ClassLibrary1/ClassLibrary1.csproj" />
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<Project Path="Generator.UnitTests/Generator.UnitTests.csproj" />
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<Project Path="Generator/Generator.csproj" />
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</Solution>

‎Demo/2026/DependencyPropertyGenerator/ClassLibrary1/Class1.cs‎

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using System.Windows;
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namespace ClassLibrary1;
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public partial class Class1 : DependencyObject
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{
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[DependencyPropertyGenerator.DependencyProperty]
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public partial int P { get; set; }
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}

‎Demo/2026/DependencyPropertyGenerator/ClassLibrary1/ClassLibrary1.csproj‎

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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<TargetFramework>net10.0-windows</TargetFramework>
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<ImplicitUsings>enable</ImplicitUsings>
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<Nullable>enable</Nullable>
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<UseWPF>true</UseWPF>
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</PropertyGroup>
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<ItemGroup>
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<ProjectReference Include="..\Generator\Generator.csproj">
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<OutputItemType>Analyzer</OutputItemType>
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<ReferenceOutputAssembly>false</ReferenceOutputAssembly>
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</ProjectReference>
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</ItemGroup>
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</Project>

‎Demo/2026/DependencyPropertyGenerator/Generator.UnitTests/DependencyPropertyGenerator.cs‎

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using Microsoft.CodeAnalysis;
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using Microsoft.CodeAnalysis.CSharp;
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using System.Diagnostics.CodeAnalysis;
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using System.Runtime.InteropServices;
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using Xunit;
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namespace Generator.UnitTests;
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public class DependencyPropertyGeneratorTests
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{
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[Fact]
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public void X()
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{
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RunGenerator("""
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class C
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{
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[DependencyPropertyGenerator.DependencyProperty]
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public partial int P { get; set; }
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}
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""",
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"C.P",
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"""
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using System.Windows;
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partial class C
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{
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public static readonly DependencyProperty PProperty =
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DependencyProperty.Register(
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nameof(P),
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typeof(System.Int32),
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typeof(C),
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new PropertyMetadata(default(System.Int32)));
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public partial System.Int32 P
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{
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get => (System.Int32)GetValue(PProperty);
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set => SetValue(PProperty, value);
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}
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}
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""");
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}
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private static void RunGenerator(
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[StringSyntax("C#")] string targetSource,
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string fileName,
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[StringSyntax("C#")] string generatedSource)
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{
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var parseOptions = new CSharpParseOptions(LanguageVersion.Latest);
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var driver = CSharpGeneratorDriver.Create(new DependencyPropertyGenerator()).WithUpdatedParseOptions(parseOptions);
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var compilation = CSharpCompilation.Create("GeneratorTest",
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references: [MetadataReference.CreateFromFile(typeof(object).Assembly.Location)],
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options: new CSharpCompilationOptions(OutputKind.DynamicallyLinkedLibrary));
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compilation = compilation.AddSyntaxTrees(CSharpSyntaxTree.ParseText(targetSource, parseOptions));
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driver.RunGeneratorsAndUpdateCompilation(compilation, out var newCompilation, out var diagnostics);
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foreach (var t in newCompilation.SyntaxTrees)
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{
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if (t.FilePath.EndsWith(fileName + ".g.cs"))
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{
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var s = t.GetText().ToString();
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Assert.Equal(generatedSource, s);
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}
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}
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}
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}

‎Demo/2026/DependencyPropertyGenerator/Generator.UnitTests/Generator.UnitTests.csproj‎

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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<ImplicitUsings>enable</ImplicitUsings>
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<Nullable>enable</Nullable>
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<TargetFramework>net9.0</TargetFramework>
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<IsTestProject>true</IsTestProject>
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<IsPackable>false</IsPackable>
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<LangVersion>latest</LangVersion>
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<DisableTransitiveProjectReferences>false</DisableTransitiveProjectReferences>
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</PropertyGroup>
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<ItemGroup>
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<ProjectReference Include="..\Generator\Generator.csproj" />
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</ItemGroup>
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<ItemGroup>
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<PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.0.1" />
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<PackageReference Include="xunit" Version="2.9.3" />
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<PackageReference Include="xunit.runner.visualstudio" Version="3.1.5">
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<IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
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<PrivateAssets>all</PrivateAssets>
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</PackageReference>
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</ItemGroup>
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</Project>

‎Demo/2026/DependencyPropertyGenerator/Generator/DependencyPropertyGenerator.cs‎

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using Microsoft.CodeAnalysis;
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using Microsoft.CodeAnalysis.CSharp;
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using Microsoft.CodeAnalysis.CSharp.Syntax;
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namespace Generator;
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[Generator]
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public class DependencyPropertyGenerator : IIncrementalGenerator
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{
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public void Initialize(IncrementalGeneratorInitializationContext context)
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{
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context.RegisterPostInitializationOutput(ctx => ctx.AddSource(
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"DependencyPropertyAttribute.g.cs",
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/* lang=C# */
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"""
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using System;
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namespace DependencyPropertyGenerator;
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[AttributeUsage(AttributeTargets.Property, AllowMultiple = false, Inherited = false)]
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public class DependencyPropertyAttribute : Attribute
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{
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}
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"""));
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var propertyDeclarations = context.SyntaxProvider.ForAttributeWithMetadataName(
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"DependencyPropertyGenerator.DependencyPropertyAttribute",
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(node, _) => IsPartialProperty(node),
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(context, _) => GetSemanticTargetForGeneration(context));
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context.RegisterSourceOutput(propertyDeclarations, static (spc, source) => Execute(source, spc));
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}
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private static bool IsPartialProperty(SyntaxNode node)
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{
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return node is PropertyDeclarationSyntax propertyDeclaration &&
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propertyDeclaration.Modifiers.Any(SyntaxKind.PartialKeyword);
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}
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private static PropertyInfo GetSemanticTargetForGeneration(GeneratorAttributeSyntaxContext context)
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{
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var p = (PropertyDeclarationSyntax)context.TargetNode;
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var t = context.SemanticModel.GetTypeInfo(p.Type).Type!;
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var ct = context.SemanticModel.GetDeclaredSymbol(p)!.ContainingType;
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var pi = new PropertyInfo(
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p.Identifier.Text,
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t.ContainingNamespace + "." + t.Name,
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ct.Name,
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ct.ContainingNamespace.Name);
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return pi;
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}
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private static void Execute(PropertyInfo? propertyInfo, SourceProductionContext context)
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{
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if (propertyInfo is null)
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return;
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var source = GenerateSource(propertyInfo);
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context.AddSource($"{propertyInfo.ClassName}.{propertyInfo.PropertyName}.g.cs", source);
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}
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private static string GenerateSource(PropertyInfo propertyInfo)
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{
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var (propertyName, propertyType, className, namespaceName) = propertyInfo;
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var namespaceDeclaration = string.IsNullOrEmpty(namespaceName)
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? string.Empty
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: $"""
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namespace {namespaceName};
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""";
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return $$"""
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using System.Windows;
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{{namespaceDeclaration}}partial class {{className}}
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{
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public static readonly DependencyProperty {{propertyName}}Property =
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DependencyProperty.Register(
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nameof({{propertyName}}),
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typeof({{propertyType}}),
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typeof({{className}}),
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new PropertyMetadata(default({{propertyType}})));
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public partial {{propertyType}} {{propertyName}}
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{
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get => ({{propertyType}})GetValue({{propertyName}}Property);
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set => SetValue({{propertyName}}Property, value);
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}
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}
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""";
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}
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private record PropertyInfo(
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string PropertyName,
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string PropertyType,
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string ClassName,
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string Namespace);
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}

‎Demo/2026/DependencyPropertyGenerator/Generator/Generator.csproj‎

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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<TargetFramework>netstandard2.0</TargetFramework>
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<Nullable>enable</Nullable>
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<LangVersion>14</LangVersion>
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<EnforceExtendedAnalyzerRules>true</EnforceExtendedAnalyzerRules>
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</PropertyGroup>
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<ItemGroup>
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<PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="5.0.0" />
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</ItemGroup>
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</Project>

‎Demo/2026/DependencyPropertyGenerator/Generator/PolyFill.cs‎

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namespace System.Runtime.CompilerServices
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{
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[AttributeUsage(AttributeTargets.Class | AttributeTargets.Struct | AttributeTargets.Interface | AttributeTargets.Enum | AttributeTargets.Delegate, Inherited = false)]
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internal sealed class IsExternalInit : Attribute
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{
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}
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}

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