自定義ajax錯誤來自C＃

Question

我想從C＃中設置自定義錯誤，而不是像現在這樣默認xhr.responseText。 如何將cSharpErrorMessage傳遞給ajax錯誤？

這裏是我的C＃代碼：

 [WebMethod] 
     [ScriptMethod(ResponseFormat = ResponseFormat.Json)] 
     public static AjaxResult<string> GetAutoCompleteHtml(string termList) 
     { 
      const string cSharpErrorMessage = "Unable to generate autocomplete HTML."; 

      try 
      { 
       //some logic 
      } 
      catch (Exception ex) 
      { 
       //some logic 
      } 
     } 

這裏是我的ajax功能：

function StartAutoCompleteSearch(termsList) { 
    if (termsList.length > 2) { 
     $.ajax({ 
      url: '/Ajax/AjaxCalls.aspx/GetAutoCompleteHtml', 
      type: 'POST', 
      data: "{'termList':'" + termsList + "'}", 
      global: false, 
      datatype: JSON, 
      success: function(response) { 
       //some logic 
      }, 
      error: function(xhr, response) { 
       var err = eval("(" + xhr.responseText + ")"); 
       alert(err.Message + " Click OK to log back in "); 
       window.location = "/login"; 
      } 
     }); 
    } 
} 

Answer 1

只是拋出一個異常。就像這樣：

throw new Exception(cSharpErrorMessage); 

實例與您的代碼：

[WebMethod] 
[ScriptMethod(ResponseFormat = ResponseFormat.Json)] 
public static AjaxResult<string> GetAutoCompleteHtml(string termList) 
{ 
     const string cSharpErrorMessage = "Unable to generate autocomplete HTML."; 

     try 
     { 
       //some logic 
     } 
     catch (Exception ex) 
     { 
       //some logic to clean up and then throw exception 
       throw new Exception(cSharpErrorMessage); 
     } 
    } 

如果需要顯示錯誤消息作爲Ajax調用的第三個參數，試試這個：

HttpContext.Current.Response.StatusCode = 500; 
HttpContext.Current.Response.StatusDescription = cSharpErrorMessage; 
HttpContext.Current.Response.End(); 

你腳本：

error: function(xhr, response,errorThrown) { 
       alert(errorThrown + " Click OK to log back in "); 
       window.location = "/login"; 
      }