WebRequest.Create 和GetResponse() 之类的函数，返回值是什么啊？如何判断是否正确啊
下面程序想判断能够访问网页http://www.sina.com.cn，并能读取内容
可是在那句后面加判断呢，看MSDN都没有返回值啊？
WebRequest request = WebRequest.Create("http://www.sina.com.cn");
WebResponse response = request.GetResponse();
Stream resStream = response.GetResponseStream();
StreamReader sr = new StreamReader(resStream, System.Text.Encoding.Default);
string tempCode = sr.ReadToEnd();
resStream.Close();
sr.Close();

[解决办法]

C# code

HttpWebRequest request =(HttpWebRequest)(WebRequest.Create("http://www.sina.com.cn")); HttpWebResponse response =(HttpWebResponse)request.GetResponse(); if(response.StatusCode==HttpStatusCode.OK)//因为发送的是HTTP请求，所以可以强制转换成HttpWebResponse，用以获取它的StatusCode,这是表示请求状态{Stream resStream =response.GetResponseStream();StreamReader sr = new StreamReader(resStream, System.Text.Encoding.Default); string tempCode = sr.ReadToEnd(); resStream.Close(); sr.Close();}