轉自:http://www.cdtarena.com/cpx/201307/9287.html
在寫一個小程序的時候,碰到了這樣的問題,需要用委託來掛接事件,但是又想在這事件中使用局部的變量,而委託一旦定義好後,掛接方就沒有辦法再添加額外的形參了。那有沒有什麼 辦法,可以實現呢?
委託定義如下:
publicclass SocketSp
{
publicdelegatevoid ReceiveCompleted(byte[] receiveBuffer, int receiveTotalLen,Exception ex);
public ReceiveCompleted receiveCompleted;
}
publicclass LinkOuter
{
SocketSp linkOuterSocket = new SocketSp();
privatevoid test(Socket requestHandleSocket)
{
//此處要掛接 linkOuterSocket.receiveCompleted 事件,同時想將參數requestHandleSocket傳入,以便後續處理。
}
}
privatevoid test(Socket requestHandleSocket)
{
linkOuterSocket.receiveCompleted += delegate {
//To do
};
}
privatevoid test(Socket requestHandleSocket)
{
linkOuterSocket.receiveCompleted += (Action)((outerReceiveBuffer, totalLen, ex) => {
//To do http://www.cdtarena.com/qrs.html
});
}
privatevoid test(Socket requestHandleSocket)
{
linkOuterSocket.receiveCompleted += new SocketSp.ReceiveCompleted((outerReceiveBuffer,totalLen,ex) =>
{
byte[] realOuterReceiveBuffer = newbyte[totalLen];
Array.Copy(outerReceiveBuffer, 0, realOuterReceiveBuffer, 0, totalLen);
sendResponse(requestHandleSocket, realOuterReceiveBuffer,"200 OK", "text/html");
});
}
最終用lambda表達式實現了。