public class WeChatRequestModel
    {
    public string signature { get; set; }
    public string timestamp { get; set; }
    public string nonce { get; set; }
    public string echostr { get; set; }
    }

public class HomeController :Controller
       {
          /// <summary>
          /// 定義Token，與微信公共平臺(tái)上的Token保持一致
          /// </summary>
          private const string Token = "StupidMe";
           /// <summary>
           /// 驗(yàn)證簽名，檢驗(yàn)是否是從微信服務(wù)器上發(fā)出的請(qǐng)求
           /// </summary>
           /// <param name="model">請(qǐng)求參數(shù)模型 Model</param>
           /// <returns>是否驗(yàn)證通過(guò)</returns>
           private bool CheckSignature(Model.FormatModel.WeChatRequestModel model)
           {
               string signature, timestamp, nonce, tempStr;
               //獲取請(qǐng)求來(lái)的參數(shù)
               signature = model.signature;
               timestamp = model.timestamp;
               nonce = model.nonce;
               //創(chuàng)建數(shù)組，將 Token, timestamp, nonce 三個(gè)參數(shù)加入數(shù)組
              string[] array = { Token, timestamp, nonce };
              //進(jìn)行排序
               Array.Sort(array);
               //拼接為一個(gè)字符串
               tempStr = String.Join("", array);
               //對(duì)字符串進(jìn)行 SHA1加密
               tempStr = FormsAuthentication.HashPasswordForStoringInConfigFile(tempStr, "SHA1").ToLower();
               //判斷signature 是否正確
               if (tempStr.Equals(signature))
              {
                   return true;
               }
               else
               {
                   return false;
               }
           }
           public void Valid(Model.FormatModel.WeChatRequestModel model)
           {
               //獲取請(qǐng)求來(lái)的 echostr 參數(shù)
               string echoStr = model.echostr;
              //通過(guò)驗(yàn)證
               if (CheckSignature(model))
               {
                  if (!string.IsNullOrEmpty(echoStr))
                  {
                      //將隨機(jī)生成的 echostr 參數(shù) 原樣輸出
                       Response.Write(echoStr);
                       //截止輸出流
                       Response.End();
                   }
               }
           }
       }