C# 在Roslyn中是否有基于InvocationExpressionSyntax的MethodDeclarationSyntax？

我想写roslyn的代码重构，所以我写了一个类似

class Program
{
    [Obsolete()]
    public static void A() { }

    static void Main(string[] args)
    {
        A(); // I moved the mouse here and captured as InvocationExpressionSyntax 
        Console.WriteLine("Hello World!");
    }
}

我选择了一个（）作为InvocationExpressionSyntax，所以我想知道我是否可以获取所选方法的MethodDeclarationSyntax或更好的属性

意味着

或

可能吗

我想找到一个方法的所有属性，以便进行重构

编辑

public sealed override async Task ComputeRefactoringsAsync(CodeRefactoringContext context)
{
    // TODO: Replace the following code with your own analysis, generating a CodeAction for each refactoring to offer

    var root = await context.Document.GetSyntaxRootAsync(context.CancellationToken).ConfigureAwait(false);

    // Find the node at the selection.
    var node = root.FindNode(context.Span);

    // Only offer a refactoring if the selected node is a type declaration node.
    var typeDecl = node.Parent as InvocationExpressionSyntax;
    if (typeDecl == null)
    {
        return;
    }

    // For any type declaration node, create a code action to reverse the identifier text.
    var action = CodeAction.Create("Reverse type name", c => ReverseTypeNameAsync(context.Document, typeDecl, c));

    // Register this code action.
    context.RegisterRefactoring(action);
}

编辑2

类库1：

班级图书馆2

代码重构项目：

---

我怀疑您只是想获取语义模型，向它索要符号，然后获取属性：

// After you've made sure that you've got an InvocationExpressionSyntax
var model = await context.Document
    .GetSemanticModelAsync(context.CancellationToken)
    .ConfigureAwait(false);
var symbol = model.GetSymbolInfo(invocation);
var attributes = symbol.Symbol?.GetAttributes();
// Examine attributes; it will be null if the symbol wasn't resolved

---

我不知道获取语义模型的成本有多高——可能有更高性能的替代方案，但我希望这至少能起作用。

您的上下文是什么？我相信您基本上希望获得

SemanticModel

并调用

model.GetSymbolInfo（调用）

。这将解析符号，然后可以对符号调用

GetAttributes（）

。但是你确实需要语义模型…@JonSkeet，我编辑了我的帖子，样本来自代码重构VS模板，我得到了'var typeDecl=node.Parent as InvocationExpressionSyntax；'但你说我需要语义模型，那我该怎么做？您能否根据上述源代码进行更多解释？如果有

文档

，您可以调用

文档。GetSemanticModelAsync

…谢谢，您的解决方案对上述示例非常有效，但我在单独的程序集中定义了属性，并在另一个程序集中编程了方法，我想获得GetAttributes（）从目前的项目来看，这种方法似乎不起作用。正如你所说，它是空的。你有解决办法吗？它适用于外部源代码吗？我编辑了我的帖子again@user7489391：这不是堆栈溢出的工作方式-您不必不断更改您的请求。这不是一个交互式调试会话。我希望

GetAttributes（）

能够很好地处理来自其他程序集的方法和属性，只要编译器能够解析它们。

public sealed override async Task ComputeRefactoringsAsync(CodeRefactoringContext context)
{
    // TODO: Replace the following code with your own analysis, generating a CodeAction for each refactoring to offer

    var root = await context.Document.GetSyntaxRootAsync(context.CancellationToken).ConfigureAwait(false);

    // Find the node at the selection.
    var node = root.FindNode(context.Span);

    // Only offer a refactoring if the selected node is a type declaration node.
    var typeDecl = node.Parent as InvocationExpressionSyntax;
    if (typeDecl == null)
    {
        return;
    }

    // For any type declaration node, create a code action to reverse the identifier text.
    var action = CodeAction.Create("Reverse type name", c => ReverseTypeNameAsync(context.Document, typeDecl, c));

    // Register this code action.
    context.RegisterRefactoring(action);
}

[AttributeUsage(AttributeTargets.Method, AllowMultiple = true, Inherited = false)]
    public class CustomAttribute : Attribute
    {}

public static class Class1
{
    [CustomAttribute] // Comes from ClassLibrary1
    public static string SayHelloTo(string name)
    {
        return $"Hello {name}";
    }

class Program
{
    [Obsolete()]
    public static void A() { }

    static void Main(string[] args)
    {
        A(); // I moved the mouse here and captured as InvocationExpressionSyntax 
        var t = ClassLibrary2.Class1.SayHelloTo("Test");  // ????? Symbol is NULL ?????
    }
 }

// After you've made sure that you've got an InvocationExpressionSyntax
var model = await context.Document
    .GetSemanticModelAsync(context.CancellationToken)
    .ConfigureAwait(false);
var symbol = model.GetSymbolInfo(invocation);
var attributes = symbol.Symbol?.GetAttributes();
// Examine attributes; it will be null if the symbol wasn't resolved