我可以组合2个不同的代表 [英] Can I Combine 2 Different Delegates

问题描述

class Foo
{
    [DllImport("kernel32.dll", EntryPoint = "GetProcAddress")]
    private static extern IntPtr GetProcAddress(IntPtr hModule, string procName);

    public delegate void TestMethod(uint cap);
    public static TestMethod Method;

    static Foo()
    {
        Method = Func<TestMethod>("TestMethod");
    }

    public static T Func<T>(string name) where T : class
    {
        IntPtr _dll = IntPtr.Zero;// ptr to dll

        IntPtr ptr = GetProcAddress(_dll, name);

        Delegate a = Marshal.GetDelegateForFunctionPointer(ptr, typeof(T));

        //Create delegate of type T but with different body of a => { Console.WriteLine("test"); };
        Delegate b;
 
        //Multicast delegate
        return Delegate.Combine(a, b) as T;
    }
}

然后



Foo.Method（）; //执行方法并在控制台中写入



重点是包装T代理并为其添加功能。



可以这样做吗？

then

Foo.Method(); // executes the method and writes in console

The point is to wrap the T delegate and add functionality to it.

Can this be done ?

推荐答案

delegate void EnclosingDelegate(string parameter);

delegate string EnclosedDelegate();

class foo
{
   void main() {
      EnclosedDelegate enclosed = () => "foo";
      EnclosingDelegate enclosing = (s) => s = enclosed();
   }
}

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