1  public static string HttpPost(string Url, string postDataStr)  
 2 {  
 3     HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);  
 4     request.Method = "POST";  
 5     request.ContentType = "application/x-www-form-urlencoded";  
 6     request.ContentLength = postDataStr.Length;  
 7     StreamWriter writer = new StreamWriter(request.GetRequestStream(),Encoding.ASCII);  
 8     writer.Write(postDataStr);  
 9     writer.Flush();  
10     HttpWebResponse response = (HttpWebResponse)request.GetResponse();  
11     string encoding = response.ContentEncoding;  
12     if (encoding == null || encoding.Length < 1) {  
13         encoding = "UTF-8"; //默认编码  
14     }  
15     StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.GetEncoding(encoding));  
16     string retString = reader.ReadToEnd();  
17     return retString;  
18 }