C#进行异步HTTP调用

我想让我的网站打电话到一个网址，就是这样。我不需要等待回复。我的ASP.Net项目以前使用webRequest.BeginGetResponse（null，requestState），但最近已停止工作。没有抛出错误，但我已确认从未调用URL

当我使用webRequest.GetResponse（）时，确实会调用URL，但这种方法不是异步的，我需要它是异步的

这是我的代码，有什么想法可能是错误的吗

HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create(new Uri(url));
webRequest.Method = "GET";
NetworkCredential nc = new NetworkCredential("theUsername", "thePassword");
webRequest.Credentials = nc;
webRequest.PreAuthenticate = true; 
RequestState rs = new RequestState();
rs.Request = webRequest;
IAsyncResult r = (IAsyncResult)webRequest.BeginGetResponse(null, rs);

这是可以工作但不是异步的代码

HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create(new Uri(url));
webRequest.Method = "GET";
NetworkCredential nc = new NetworkCredential("theUsername", "thePassword");
webRequest.Credentials = nc;
webRequest.PreAuthenticate = true;            
HttpWebResponse webResponse = (HttpWebResponse)webRequest.GetResponse();

---

BeginGetResponse

应该可以工作。但是，我怀疑您的程序在实际发送请求之前终止

实际上，您需要做的是等待响应并处理它。要做到这一点，您需要有一个回调

HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create(new Uri(url));
webRequest.Method = WebRequestMethods.Http.Get;
NetworkCredential nc = new NetworkCredential("theUsername", "thePassword");
webRequest.Credentials = nc;
webRequest.PreAuthenticate = true; 
RequestState rs = new RequestState();
rs.Request = webRequest;
WebResponse response;
IAsyncResult r = (IAsyncResult)webRequest.BeginGetResponse(x => response = webRequest.EndGetResponse(x), rs);
Thread.Sleep(10000);

然而，你真的不应该再使用APM模型了

您应该使用async/await

HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create(new Uri(url));
webRequest.Method = WebRequestMethods.Http.Get;
NetworkCredential nc = new NetworkCredential("theUsername", "thePassword");
webRequest.Credentials = nc;
webRequest.PreAuthenticate = true; 
RequestState rs = new RequestState();
rs.Request = webRequest;
WebResponse response = await webRequest.GetResponseAsync();

您还缺少一组使用/

.Dispose（）

方法的