c#事件和委托代码demo

回调函数

say(test);
void test(){
Console.WriteLine("123");
}
void say(callback callback){
Console.WriteLine("....");
Thread.Sleep(2000);
	callback();
}
delegate void callback();

pickone(1,2,myspecialrule).Dump();
int pickone(int a, int b, mYRule rule)
{
	if (rule(a, b))
	{
		return a;
	}
	else
	{
		return b;
	}
}
bool myspecialrule(int x, int y)
{
	return true;
}
delegate bool mYRule(int x, int y);

事件

var demo=new demo();
demo.MyEvent+=()=>"hello".Dump();
demo.InvokeEvent();
class demo{
	
	public event Action MyEvent;
	public void InvokeEvent(){
		MyEvent?.Invoke();
	}
}

值改变触发

var demo=new demo();
demo.MyValueChanges+=()=>"value change observed".Dump();
demo.Myvalue=10;

class demo{
	int myvalue;
	public int Myvalue{
		get{return myvalue;}
		set{
			myvalue=value;
			MyValueChanges?.Invoke();
		}
	}
	public event Action MyValueChanges;
}