添加

 [HttpPost]
       public HttpResponseMessage FingerMatchApi(dynamic obj)                         //动态类型参数  接收Json字符串
       {
           string sysName = Convert.ToString(obj.sysName);
           string loginId = Convert.ToString(obj.loginId);
           string strTZ = Convert.ToString(obj.strTZ);
           string vendor = Convert.ToString(obj.vendor);
       }

      //调用WebApi进行指纹匹配
       public void FpMatchUseApi(string loginId, string tz, string arg)
       {
           try
           {               

               string url = "http://~/api/FingerMatch/FingerMatchApi";                      //办公网测试API  访问的是10.243.16.61上面的Finger数据库
      

               string postData = "";
               string status = "";

               var obj = new { sysName = "指纹录入系统", loginId = loginId, strTZ = tz, vendor = arg }; 

               postData = JsonHelper.Add_ToJson(obj);

               string result = ApiHelper.PostResponse(url, postData, out status);            //调用指纹API
            }
         }

API使用dynamic 传参