用戶控制控件是空

我一個webService.asmx使用Jquery和服務裏面我正在檢索usercontrol控件的值，將其保存在數據庫中，但用戶控制已拋出一個NullReferenceException用戶控制控件是空

這裏呼籲的Ajax通話

function SaveEdit() 
    { 
     $.ajax({ 
      type: "POST", 
      url: "Services/RatiosSettingsService.asmx/UpdateRatios", 
      data: "{}", 
      contentType: "application/json; charset=utf-8", 
      dataType: "json", 
      success: function (result) { } 
     }); 
    }

，這是WebService代碼

[WebMethod] 
    public void UpdateRatios() 
    { 
     using (SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["Crs2"].ConnectionString)) 
     { 
      ADO ado = new ADO(); 
      List<SqlParameter> parameters = new List<SqlParameter>(); 
      ucOtherRatios2 obj = new ucOtherRatios2(); 

      Dictionary<string, int> hs = obj.GetHsChks(); 

      foreach (KeyValuePair<string, int> item in hs) 
      { 
       SqlParameter para = new SqlParameter(item.Key, item.Value); 
       parameters.Add(para); 
      } 

      con.Open(); 
      ado.CUDSp("UpdateRatios", "spUpdateClientRatios",parameters,con); 
      con.Close(); 
     } 
    }

，這裏是其中的例外用戶控件方法內發生了檢索控件值

public Dictionary<string, int> GetHsChks() 
    { 
     Dictionary<string, int> chks = new Dictionary<string, int>(); 

     chks.Add("@siAnalysisOtherRatiosHistorical1", Convert.ToInt32(chkOthWcHs.Checked)); 
     chks.Add("@siAnalysisOtherRatiosHistorical2", Convert.ToInt32(chkOthWiHs.Checked)); 
     chks.Add("@siAnalysisOtherRatiosHistorical3", Convert.ToInt32(chkOthTlgHs.Checked)); 
     chks.Add("@siAnalysisOtherRatiosHistorical4", Convert.ToInt32(chkOthEiHs.Checked)); 
     chks.Add("@siAnalysisOtherRatiosHistorical5", Convert.ToInt32(chkOthEcHs.Checked)); 

     chks.Add("@siAnalysisOtherRatiosHistorical6", Convert.ToInt32(chkOthEicHs.Checked)); 
     chks.Add("@siAnalysisOtherRatiosHistorical7", Convert.ToInt32(chkOthEsHs.Checked)); 
     chks.Add("@siAnalysisOtherRatiosHistorical8", Convert.ToInt32(chkOthEtHs.Checked)); 

     return chks; 
    }

它說，複選框爲空

來源

2017-08-07 Ahmad A. Al-Dwairi