static void Main17(string[] args)
{
#region
//实例代码见D:\MS VisualStudio\VSWorkspace\DelegateExample.cs
#endregion
#region delegate内部一日游
SomeListener sl = new SomeListener();
SuperFuncPointer sfp = new SuperFuncPointer(sl.OnCalled);
Console.WriteLine(sfp.Target.GetType()); //_target -> 方法的实例对象
Console.WriteLine(sfp.Method.Name); //_method -> 方法methodInfo
#endregion
#region 显式调用_invocationList
CombinedDele cd = null;
cd = Delegate.Combine(cd, new CombinedDele(MethodOne)) as CombinedDele;
cd = Delegate.Combine(cd, new CombinedDele(MethodTwo)) as CombinedDele;
Delegate[] list = cd.GetInvocationList();
//这样就可以loop了
int sum = 0;
for (int i = 0; i < list.Length; i++)
{
CombinedDele d = list[i] as CombinedDele;
sum += d.Invoke();
}
Console.WriteLine(sum);
#endregion
#region C#中委托的简化语法
GiveMeDele(MethodOne); //1. 方法定义要一个delegate, 但是传入一个符合规范的方法就行
//2. Lambda
GiveMeDele(() => { return(5); });
GiveMeDele(() => { Console.WriteLine("I am a lambda"); return(10); });
//3. Lambda在一个方法内时, 其主体直接使用方法的局部变量, 实质是背后生成一个辅助类
#endregion
#region 运行时确定一个具体的delegate,生产一个实例并调用他
Type runtimeT = Type.GetType(args[0]);
//GetMethod需要指定non public否则找不到private方法
System.Reflection.MethodInfo runtimeM = typeof(Chapter17_Delegate).GetMethod(args[1], System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Static);
Delegate runtimeD;
runtimeD = Delegate.CreateDelegate(runtimeT, runtimeM);
//这里没有传参, 单DynamicInvoke可以接收任意参数, 并在内部判断是否可用
object r = runtimeD.DynamicInvoke();
Console.WriteLine(r.ToString());
#endregion
}
static void GiveMeDele(CombinedDele cd)
{
return;
}
