c# .net 静态织入 代码生成 Source Generators

1. 必须创建 netstandard项目【ClassLibrary1】来存放代码生成接口

 [Generator]
    public class DemoSourceGenerator : ISourceGenerator
    {
        public void Execute(GeneratorExecutionContext context)
        {
            // Find the main method
            var mainMethod = context.Compilation.GetEntryPoint(context.CancellationToken);

            // Build up the source code
            string source = $@"// <auto-generated/>
using System;

namespace {mainMethod.ContainingNamespace.ToDisplayString()}
{{
    public static partial class {mainMethod.ContainingType.Name}
    {{
        static partial void HelloFrom(string name) =>
            Console.WriteLine($""Generator says: Hi from '{{name}}'"");
    }}
}}
";
            var typeName = mainMethod.ContainingType.Name;

            // Add the source code to the compilation
            context.AddSource($"{typeName}.g.cs", source);
        }

        public void Initialize(GeneratorInitializationContext context)
        {
            // No initialization required for this one
        }
    }

2. 创建测试程序 - 控制台【ConsoleApp1】

partial class Program
    {
        static void Main(string[] args)
        {
            HelloFrom("Generated Code");
        }

        static partial void HelloFrom(string name);
    }

3. 配置【ConsoleApp1】添加 OutputItemType="Analyzer" ReferenceOutputAssembly="false"

![](/i/l/?n=23&i=blog/944369/202304/944369-20230404183201456-1511027424.png)

4. 运行得到结果

![](/i/l/?n=23&i=blog/944369/202304/944369-20230404183247836-1993282203.png)

Demo

[参考]
源生成器
抽丝剥茧！Source Generators原理讲解