C# 中如何利用lambda实现委托事件的挂接

委托定义如下：

public class socketsp
{
 public delegate void receivecompleted(byte[] receivebuffer, int receivetotallen,exception ex);
 public receivecompleted receivecompleted;
}

挂接方定义如下

public class linkouter
{
 socketsp linkoutersocket = new socketsp();

       private void test(socket requesthandlesocket)
      {
           //此处要挂接  linkoutersocket.receivecompleted 事件，同时想将参数requesthandlesocket传入，以便后续处理。
      }
}

第一个想法是利用delegate，但是失败了。因为虽然挂接上去了，委托传进的参数丢了，无法进行后续操作。

private void test(socket requesthandlesocket)
{
linkoutersocket.receivecompleted += delegate {
//to do
};
}

第二个想法是利用action，结果也失败了。ide提示委托action未采用3个参数。

private void test(socket requesthandlesocket)
{
linkoutersocket.receivecompleted += (action)((outerreceivebuffer, totallen, ex) => {
//to do
});
}

第三个想法是利用lambda表达式，先与委托挂接，同时利用局部变量的调用，来实现参数传递到sendresponse函数中，以便后续操作。

private void test(socket requesthandlesocket)
{
linkoutersocket.receivecompleted += new socketsp.receivecompleted((outerreceivebuffer,totallen,ex) =>
{
byte[] realouterreceivebuffer = new byte[totallen];
array.copy(outerreceivebuffer, 0, realouterreceivebuffer, 0, totallen);
sendresponse(requesthandlesocket, realouterreceivebuffer,"200 ok", "text/html");
});
}

最终用lambda表达式实现了。