/// 傳送請求  
        /// </summary>  
        /// <param name="url">請求地址</param>  
        /// <param name="sendData">引數格式 “name=王武&pass=123456”</param>  
        /// <returns></returns>  
        public static string RequestWebAPI(string url, string sendData)  
        {  
            string backMsg = "";  
            try  
            {  
                System.Net.WebRequest httpRquest = System.Net.HttpWebRequest.Create(url);  
                httpRquest.Method = "POST";  
                //這行程式碼很關鍵，不設定ContentType將導致後臺引數獲取不到值  
                httpRquest.ContentType = "application/x-www-form-urlencoded;charset=UTF-8";  
                byte[] dataArray = System.Text.Encoding.UTF8.GetBytes(sendData);  
                //httpRquest.ContentLength = dataArray.Length;  
                System.IO.Stream requestStream = null;  
                if (string.IsNullOrWhiteSpace(sendData) == false)  
                {  
                    requestStream = httpRquest.GetRequestStream();  
                    requestStream.Write(dataArray, 0, dataArray.Length);  
                    requestStream.Close();  
                }  
                System.Net.WebResponse response = httpRquest.GetResponse();  
                System.IO.Stream responseStream = response.GetResponseStream();  
                System.IO.StreamReader reader = new System.IO.StreamReader(responseStream, System.Text.Encoding.UTF8);  
                backMsg = reader.ReadToEnd();  
  
  
                reader.Close();  
                reader.Dispose();  
  
  
                requestStream.Dispose();  
                responseStream.Close();  
                responseStream.Dispose();  
            }  
            catch (Exception)  
            {  
                throw;  
            }  
            return backMsg;  
        }