hello world

Generator/Generator.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+  <ItemGroup>
+    <PackageReference Include="Microsoft.CodeAnalysis.Analyzers" Version="3.11.0">
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+      <PrivateAssets>all</PrivateAssets>
+    </PackageReference>
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.13.0" />
+  </ItemGroup>
+</Project>

Generator/MySourceGenerator.cs

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+using System.Text;
+using Microsoft.CodeAnalysis;
+using Microsoft.CodeAnalysis.Text;
+
+namespace MySourceGenerator {
+	[Generator]
+	public class MySourceGenerator : ISourceGenerator {
+		public void Execute(GeneratorExecutionContext context) {
+			var sb = new StringBuilder();
+			sb.AppendLine("using System;");
+			sb.AppendLine("namespace Generated;");
+			sb.AppendLine("public static class HelloWorld {");
+			sb.AppendLine("	public static void SayHello() {");
+			sb.AppendLine("		Console.WriteLine(\"Hello World!!!\");");
+			sb.AppendLine("	}");
+			sb.AppendLine("}");
+
+			context.AddSource("HelleWorld.generated", SourceText.From(sb.ToString(), Encoding.UTF8));
+		}
+
+		public void Initialize(GeneratorInitializationContext context) {
+			System.Diagnostics.Debugger.Launch();
+		}
+	}
+}