如何使用反射访问显式实现的方法?

因为方法的名称不是 "M" "YourNamespace.SomeBase.M" . 因此,您需要指定该名称(以及适当的 BindingFlags ),或从接口类型获取方法。

鉴于以下结构:

namespace SampleApp
{    
    interface IFoo
    {
        void M();
    }

    class Foo : IFoo
    {
        void IFoo.M()
        {
            Console.WriteLine("M");
        }
    }
}

…您可以这样做:

Foo obj = new Foo();
obj.GetType()
    .GetMethod("SampleApp.IFoo.M", BindingFlags.Instance | BindingFlags.NonPublic)
    .Invoke(obj, null);            

…或者这个:

Foo obj = new Foo();
typeof(IFoo)
    .GetMethod("M")
    .Invoke(obj, null);  

InterfaceMapping 如果你想要一个 MethodInfo 为了实施。

例如,如果我们有以下结构

namespace LibBar
{
  [AttributeUsage(AttributeTargets.Method)]
  public class AnswerAttribute : Attribute { }

  public interface IFoo
  {
    void Hello();
    int GetAnswer();
    object WhoAmI();
  }
}

在F项目中

namespace LibFoo
open LibBar

type Foo() = 
    interface IFoo with
        [<Answer>]
        member this.GetAnswer() = 42
        member this.Hello() = printf "Hello, World!"
        member this.WhoAmI() = this :> obj

GetAnswer() 通过思考,就可以得到 方法信息 对于接口

Foo obj = new Foo();
int answer = (int)typeof(IFoo)
  .GetMethod("GetAnswer")
  .Invoke(obj, null);

但是,我们想看看实现是否具有AnswerAttribute。那么光有这个就不够了 方法信息 对于接口上的方法。方法的名称为 "LibBar.IFoo.GetAnswer"

private static MethodInfo GetMethodImplementation(Type implementationType, MethodInfo ifaceMethod)
{
  InterfaceMapping ifaceMap = implementationType.GetInterfaceMap(ifaceMethod.DeclaringType);
  for (int i = 0; i < ifaceMap.InterfaceMethods.Length; i++)
  {
    if (ifaceMap.InterfaceMethods[i].Equals(ifaceMethod))
      return ifaceMap.TargetMethods[i];
  }
  throw new Exception("Method missing from interface mapping??"); // We shouldn't get here
}

...

  Foo obj = new Foo();
  MethodInfo ifaceMethod = typeof(IFoo).GetMethod("GetAnswer");
  MethodInfo implementationMethod = GetMethodImplementation(typeof(Foo), ifaceMethod);
  Console.WriteLine("GetAnswer(): {0}, has AnswerAttribute: {1}",
    implementationMethod.Invoke(obj, null),
    implementationMethod.GetCustomAttribute<AnswerAttribute>() != null);