检索泛型方法的正确超负荷的MethodInfo的

本文介绍了检索泛型方法的正确超负荷的MethodInfo的的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我有这个类型包含一个通用方法的两个重载。我想找回重载之一（与 Func键＆LT; 参数; T＆GT）使用反射。但问题是，我无法找到正确的参数类型与供给 Type.GetMethod（字符串类型[]）方法。

I have this type that contains two overloads of a generic method. I like to retrieve one of the overloads (with the Func<T> parameter) using reflection. The problem however is that I can't find the correct parameter type to supply the Type.GetMethod(string, Type[]) method with.

下面是我的类定义：

public class Foo { public void Bar<T>(Func<T> f) { } public void Bar<T>(Action<T> a) { } }

这是我想出来的，可惜没有更迭：

And this is what I've come up with, unfortunately without succes:

[TestMethod] public void Test1() { Type parameterType = typeof(Func<>); var method = typeof(Foo).GetMethod("Bar", new Type[] { parameterType }); Assert.IsNotNull(method); // Fails }

我怎样才能获得的MethodInfo 的通用方法，我知道的参数？

How can I get the MethodInfo of a generic method of which I know the parameters?

推荐答案

你为什么不使用EX pression树？这使得它更容易：

Why don't you use expression trees? This makes it much easier:

public static MethodInfo GetMethod<T>( Expression<Action<T>> methodSelector) { var body = (MethodCallExpression)methodSelector.Body; return body.Method; } [TestMethod] public void Test1() { var expectedMethod = typeof(Foo) .GetMethod("Bar", new Type[] { typeof(Func<>) }); var actualMethod = GetMethod<Foo>(foo => foo.Bar<object>((Func<object>)null) .GetGenericMethodDefinition(); Assert.AreEqual(expectedMethod, actualMethod); }