如何在WinRT中从Action获取方法名

Question

我试图从WinRT中的操作中获得方法名称，其中Action。方法不可用。到目前为止，我有这个:

public class Test2
{
    public static Action<int> TestDelegate { get; set; }
    private static string GetMethodName(Expression<Action<int>> e)
    {
        Debug.WriteLine("e.Body.NodeType is {0}", e.Body.NodeType);
        MethodCallExpression mce = e.Body as MethodCallExpression;
        if (mce != null)
        {
            return mce.Method.Name;
        }
        return "ERROR";
    }
    public static void PrintInt(int x)
    {
        Debug.WriteLine("int {0}", x);
    }
    public static void TestGetMethodName()
    {
        TestDelegate = PrintInt;
        Debug.WriteLine("PrintInt method name is {0}", GetMethodName(x => PrintInt(x)));
        Debug.WriteLine("TestDelegate method name is {0}", GetMethodName(x => TestDelegate(x)));
    }
}

当我调用TestGetMethodName()时，我得到这样的输出:

e.Body.NodeType is Call
PrintInt method name is PrintInt
e.Body.NodeType is Invoke
TestDelegate method name is ERROR

目标是获取分配给TestDelegate的方法的名称。调用"GetMethodName(x => PrintInt(x))"只是为了证明我做的至少是部分正确的。我怎样才能让它告诉我"TestDelegate方法名是PrintInt"?

Answer 1

答案比我想的要简单得多。它就是TestDelegate.GetMethodInfo(). name。不需要GetMethodName函数。我没有"使用系统"。反射，还有委托。GetMethodInfo没有出现在智能感知中，我不知何故在文档中错过了它。感谢HappyNomad弥合了这一差距。

工作代码为:

public class Test2
{
    public static Action<int> TestDelegate { get; set; }
    public static void PrintInt(int x)
    {
        Debug.WriteLine("int {0}", x);
    }
    public static void TestGetMethodName()
    {
        TestDelegate = PrintInt;
        Debug.WriteLine("TestDelegate method name is {0}", TestDelegate.GetMethodInfo().Name);
    }
}

Answer 2

private static string GetMethodName( Expression<Action<int>> e )
{
    Debug.WriteLine( "e.Body.NodeType is {0}", e.Body.NodeType );
    MethodCallExpression mce = e.Body as MethodCallExpression;
    if ( mce != null ) {
        return mce.Method.Name;
    }
    InvocationExpression ie = e.Body as InvocationExpression;
    if ( ie != null ) {
        var me = ie.Expression as MemberExpression;
        if ( me != null ) {
            var prop = me.Member as PropertyInfo;
            if ( prop != null ) {
                var v = prop.GetValue( null ) as Delegate;
                return v.Method.Name;
            }
        }
    }
    return "ERROR";
}