用POST访问时，返回403错误

request.Method要设置为大写的POST，否则会返回403错误

POST方法，也可能在服务器端无法取到POST的数据，所以还得把ContentType设置为application/x-www-form-urlencoded

以下是个例子，没有进行异常捕捉，有需要的朋友，再自己补上~~~

WebRequest req = WebRequest.Create("http://expert.csdn.net/Expert/topic/1581/1581934.xml"); req.Method = "POST"; req.ContentType = "application/x-www-form-urlencoded"; byte[] postData = System.Text.Encoding.GetEncoding("gb2312").GetBytes( "temp=1063959&userid=654321" ); //Post的数据 req.ContentLength = postData.Length; Stream postStream = req.GetRequestStream(); postStream.Write(postData, 0, postData.Length); postStream.Close(); WebResponse res = req.GetResponse(); System.Text.Encoding resEncoding = System.Text.Encoding.GetEncoding("gb2312"); //接收的编码 StreamReader reader = new StreamReader( res.GetResponseStream(),resEncoding ); string html = reader.ReadToEnd(); //接收的Html reader.Close(); res.Close();

关键的两行代码：
req.Method = "POST"; 
req.ContentType = "application/x-www-form-urlencoded";