Roslyn语法重写器如何在VisitMethodDeclaration中使用指令添加

public class MyRewriter : SyntaxRewriter
{
    public override SyntaxNode VisitMethodDeclaration(MethodDeclarationSyntax node)
    {
        // 在这里添加指令或语句
        // 例如，添加一个Console.WriteLine语句
        var newStatement = SyntaxFactory.ParseStatement("Console.WriteLine(\"Hello, World!\");");

        // 将新语句添加到方法体中
        var newBody = node.Body.AddStatements(newStatement);

        // 返回修改后的方法声明
        return node.WithBody(newBody);
    }
}

var code = @"
using System;

public class MyClass
{
    public void MyMethod()
    {
        // 这里是原始代码
    }
}";

var syntaxTree = CSharpSyntaxTree.ParseText(code);

var compilation = CSharpCompilation.Create("MyCompilation")
    .AddSyntaxTrees(syntaxTree);

var semanticModel = compilation.GetSemanticModel(syntaxTree);

var root = syntaxTree.GetRoot();
var newRoot = new MyRewriter().Visit(root);

var newCode = newRoot.ToFullString();