C#中常用作event的delegate 函数

通用用法，用户创建对象，注册事件，表示事件发生时的响应

server = new AsyncServer(10001, new byte[] { 0x0D});
server.DataReceived += (s, e) =>
{
　　　　...
};

常用event的委托函数说明和使用

1

 

public delegate void EventHandler<TEventArgs>(object sender, TEventArgs e);

使用例子：在某个类里面

public event EventHandler<TcpClientKickedEventArgs> ClientKicked;


//事件触发
if(ClientKicked!=null)
      {
           ClientKicked(this, new TcpClientKickedEventArgs(client.client));
      }

题外话：TcpClientKickedEventArgs的定义

//题外话
    public class TcpClientKickedEventArgs:EventArgs
    {
        public TcpClientKickedEventArgs(TcpClient tcpClient)
        {
            this.TcpClient = tcpClient;
        }
        public TcpClient TcpClient { get; private set; }
    }

 

2

public delegate void EventHandler(object sender, EventArgs e);

 

某个类里面

    public class TestClass
    {
        public event EventHandler TestEvent;
        public  void RaiseEvent()
        {
                //某个时刻事件触发
                TestEvent?.Invoke(this, null);
           
        }
    }

注册使用

TestClass t = new TestClass();
t.TestEvent += T_TestEvent;

.............
private void T_TestEvent(object sender, EventArgs e)
{
            MessageBox.Show("HI");
}

 其余

public delegate void Action();
public delegate void Action<in T1, in T2, in T3>(T1 arg1, T2 arg2, T3 arg3);
public delegate void Action<in T1, in T2>(T1 arg1, T2 arg2);
public delegate void Action<in T>(T obj);

public delegate TResult Func<out TResult>();
public delegate TResult Func<in T, out TResult>(T arg);
public delegate TResult Func<in T1, in T2, out TResult>(T1 arg1, T2 arg2);