public IAsyncResult MyBeginXX(AsyncCallback callback)
{
var asyncResult = new MyWebRequest(callback, null);
var request = WebRequest.Create("https://github.com/");
new Thread(() => //重新启用一个线程
{
using (StreamReader sr = new StreamReader(request.GetResponse().GetResponseStream()))
{
var str = sr.ReadToEnd();
asyncResult.SetComplete(str);//设置异步结果
}
}).Start();
return(asyncResult);//放回一个IAsyncResult
}