C# 如何使用 Type.InvokeMember 调用显式实现的接口方法？
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How to use Type.InvokeMember to call an explicitly implemented interface method?
提问by Polyfun
I want to call an explicitly implemented interface method (BusinessObject2.InterfaceMethod) via reflection, but when I try this using the following code, I get an System.MissingMethodException for the Type.InvokeMember call. Non-interface methods work OK. Is there a way to do this? Thanks.
我想通过反射调用显式实现的接口方法 (BusinessObject2.InterfaceMethod)，但是当我使用以下代码尝试此方法时，我收到 Type.InvokeMember 调用的 System.MissingMethodException。非接口方法工作正常。有没有办法做到这一点？谢谢。
using System;
using System.Reflection;
using System.Runtime.InteropServices;
using System.Text;
namespace Example
{
public class BusinessObject1
{
public int ProcessInput(string input)
{
Type type = Assembly.GetExecutingAssembly().GetType("Example.BusinessObject2");
object instance = Activator.CreateInstance(type);
instance = (IMyInterface)(instance);
if (instance == null)
{
throw new InvalidOperationException("Activator.CreateInstance returned null. ");
}
object[] methodData = null;
if (!string.IsNullOrEmpty(input))
{
methodData = new object[1];
methodData[0] = input;
}
int response =
(int)(
type.InvokeMember(
"InterfaceMethod",
BindingFlags.InvokeMethod | BindingFlags.Instance,
null,
instance,
methodData));
return response;
}
}
public interface IMyInterface
{
int InterfaceMethod(string input);
}
public class BusinessObject2 : IMyInterface
{
int IMyInterface.InterfaceMethod(string input)
{
return 0;
}
}
}
Exception details: "Method 'Example.BusinessObject2.InterfaceMethod' not found."
异常详细信息：“未找到方法 'Example.BusinessObject2.InterfaceMethod'。”
采纳答案by Rich O'Kelly
This is caused by the fact that BusinessObject2explicitly implements IMyInterface. You need to use the IMyInterfacetype to gain access to and subsequently invoke the method:
这是由BusinessObject2显式实现IMyInterface. 您需要使用该IMyInterface类型来访问并随后调用该方法：
int response = (int)(typeof(IMyInterface).InvokeMember(
"InterfaceMethod",
BindingFlags.InvokeMethod | BindingFlags.Instance | BindingFlags.Public,
null,
instance,
methodData));
