C# Source Generator Template

Consumer.csproj

<Project Sdk="Microsoft.NET.Sdk">

	<PropertyGroup>
		<OutputType>Exe</OutputType>
		<TargetFramework>net6.0</TargetFramework>
		<Nullable>enable</Nullable>
		<LangVersion>preview</LangVersion>
	</PropertyGroup>

	<ItemGroup>
		<ProjectReference Include="..\..\Library\Library.csproj" />
		<ProjectReference Include="..\..\SourceGeneratorContracts\SourceGeneratorContracts.csproj" />
		<ProjectReference Include="..\..\SourceGenerator\SourceGenerator.csproj" OutputItemType="Analyzer" ReferenceOutputAssembly="false" />
	</ItemGroup>

</Project>

ModelDtoGenerator.cs

using System.Diagnostics;
using System.Linq;
using System.Text;
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.Text;

namespace Library.SourceGenerator;

[Generator]
public class ModelDtoGenerator : ISourceGenerator
{
    public void Execute(GeneratorExecutionContext context)
    {
        var syntaxTrees = context.Compilation.SyntaxTrees;
        foreach (var syntaxTree in syntaxTrees)
        {
            var generateDtoClasses = syntaxTree.GetRoot().DescendantNodes().OfType<TypeDeclarationSyntax>()
                .Where(x => x.AttributeLists.Any(xx => xx.ToString().StartsWith("[GenerateDto")));
            foreach (var generateDtoClass in generateDtoClasses)
            {
                var usingDirectives = syntaxTree.GetRoot().DescendantNodes().OfType<UsingDirectiveSyntax>();
                var usingDirectivesAsText = string.Join("\r\n", usingDirectives);
                var sourceBuilder = new StringBuilder(usingDirectivesAsText);
                var className = generateDtoClass.Identifier.ToString();
                var dtoClassName = $"{className}Dto";
                var splitClass = generateDtoClass.ToString().Split(new[] { '{' }, 2);
                sourceBuilder.Append($@"
namespace Models
{{
    public class {dtoClassName}
    {{
");

                sourceBuilder.AppendLine(splitClass[1].Replace(className, dtoClassName));
                sourceBuilder.AppendLine("}");
                context.AddSource($"{dtoClassName}.Generated.cs", SourceText.From(sourceBuilder.ToString(), Encoding.UTF8));
                Debug.WriteLine($"{dtoClassName} generated.");
            }
        }
    }
    public void Initialize(GeneratorInitializationContext context)
    {
        //#if DEBUG
        //        if (!Debugger.IsAttached)
        //        {
        //            Debugger.Launch();
        //        }
        //#endif
    }
}

SourceGenerator.csproj

<Project Sdk="Microsoft.NET.Sdk">

	<PropertyGroup>
		<Nullable>enable</Nullable>
		<IsRoslynComponent>true</IsRoslynComponent>
		<TargetFramework>netstandard2.0</TargetFramework>
		<LangVersion>preview</LangVersion>
		<RootNamespace>Library.$(MSBuildProjectName.Replace(" ", "_"))</RootNamespace>
	</PropertyGroup>
	<ItemGroup>
		<PackageReference Include="Microsoft.CodeAnalysis.Analyzers" Version="3.3.2">
			<PrivateAssets>all</PrivateAssets>
			<IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
		</PackageReference>
		<PackageReference Include="Microsoft.CodeAnalysis.Common" Version="3.11.0" PrivateAssets="all" />
		<PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="3.11.0" PrivateAssets="all" />
		<PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="3.11.0" />
		<!--<PackageReference Include="System.CodeDom" Version="5.0.0" />-->
	</ItemGroup>
</Project>