public void method(Action<string, Int32> voidMethod, Func<string, Int32> returnMethod)
Action<string, Int32> voidMethod

Func<string, Int32> returnMethod

method(delegate(string a, string b, Int32 c)
{
  //do something 
}, delegate(string a, string b)
{
  //do something 
  return 5;
});

public void method(tuoguan voidMethod, tuoguan2 returnMethod) //这里不可以在写 Action or Func了
{
  Int32 i = returnMethod("b");
  voidMethod("b");
}
public delegate void tuoguan(string name);
public delegate Int32 tuoguan2(string name);
public Int32 returnMethod(string name)
{
  return 5;
}

  tuoguan xx = delegate(string name) 
  {
 //do somthing 
  };
  tuoguan2 yy = returnMethod; //这里可以指向某个方法，不是一定要写 delegate
  method(xx, yy);