c# - 通过反射将方法赋值给委托(delegate)

Question

我在通过反射将方法动态分配给委托(delegate)实例时遇到了困难。以下是我所面临情况的示例场景。

class Program
{
    static void Main(string[] args)
    {
        new DynamicDelegateTest().Test();            
    }
}

public class DynamicDelegateTest
{
    public void Test()
    {
        //This is what i target to do through reflection
        ABC objABC1 = new ABC();
        objABC1.Proc = Debugger;
        objABC1.Test("Helloz");

        //Implementing the same code through reflection
        ABC objABC = new ABC();
        MethodInfo MIDebugger = GetType().GetMethod("Debugger", BindingFlags.NonPublic | BindingFlags.Instance);
        FieldInfo MyProc = objABC.GetType().GetField("Proc", BindingFlags.Public | BindingFlags.Instance);

        //This is the point where I got stuck up
        MyProc.SetValue(objABC, MIDebugger);
        objABC.Test("QWERTY");  
    }

    void Debugger(object Tests)
    {
        Console.WriteLine(Tests);
    }
}

public class ABC
{
    public delegate void Delg(object P1);
    public Delg Proc;

    public void Test(object Tst)
    {
        if (Proc != null) Proc(Tst);
    }
}

请帮助。

Answer 1

您需要使用 Delegate.CreateDelegate 来获取委托(delegate)实例，而不是方法信息。对于非静态方法，这还包括目标实例。在这种情况下:

object del = Delegate.CreateDelegate(MyProc.FieldType, this, MIDebugger);
MyProc.SetValue(objABC, del);