c# - 根据 WebMethod 中提供的条件从 WebMethod 返回一个值

Question

我有一个 jQuery Ajax WebMethod 调用，如下所示:

<script type="text/javascript">
    $(document).ready(function () {
        $("#btnsubmit").click(function () {

            var arr = new Array();
            arr.push($("#control1").val()); arr.push($("#control2").val()); arr.push($("#control13 option:selected").val()); arr.push($("#control4 option:selected").val()); arr.push($("#control15 option:selected").val());

            var requestedData = JSON.stringify(arr);
            requestedData = "{'details':'" + requestedData + "'}";

            $.ajax({
                type: "POST",
                contentType: "application/json; charset=utf-8",
                url: "EmployeeDemotion.aspx/Save",
                data: requestedData,
                dataType: "json",
                success: function (result) {
                  //check the value returned from the WebMethod and provide alerts accordingly

                },

                error: function (result) {
                    alert("Error");
                }

            });
        });

    });
</script>

WebMethod 如下:

 [WebMethod(EnableSession = true)]
     public static InsertDetails[] Save(string details)
        {

            DataTable dt = new DataTable(); DataTable dts = new DataTable();

            List<InsertDetails> data = new List<InsertDetails>();
            JavaScriptSerializer js = new JavaScriptSerializer();
            string[] Tags = js.Deserialize<string[]>(details);
            object[] obj = new object[8];
            obj[0] = Tags[0].ToString(); obj[1] = Tags[1].ToString(); obj[2] = Tags[2].ToString(); obj[3] = Tags[3].ToString();
            obj[4] = Tags[4].ToString(); 


            int a = //say condition 1
            int b = //say condition 2
            if (a< b)
            {

             //insert into database and set a value which says the insertion has succeeded

            }
            else
            {
                //alert that data cannot be inserted
            }

            return data.ToArray();
        }

现在我需要将任何可能类型( bool 值、数组、字符串、整数或其他)的值返回给 ajax 方法，以便 ajax 方法中的成功函数提醒插入状态(如代码片段中所注释) ) IE;一个值应该与最后一条语句“return data.ToArray();”一起返回到ajax方法。我不要求返回元素“数据”，验证插入的值应与“数据”一起返回或以任何其他形式返回。

Answer 1

不知道你想要什么。您是希望将数据和标志都返回给客户端函数，还是只返回标志。

• 情况 1:您想要的只是返回有关 save

  中发生的操作的消息

  像这样改变你的保存方式

  [WebMethod(EnableSession = true)]
  public static string Save(string details)
  {
        string message =string.Empty;
  
        /// rest of the usual code of yours   
        ///
        if (a< b)
        {
           //rest of the code
           message = "Insertion Successful";
        }
        else
        {
           //rest of the code
           message = "Error Occured";
        }
  }
  

  并在您的客户端中使用 ajax success，简单地执行此操作:

  success: function (result) {
                 alert(result.d);
  }
  

• 情况 2:如果插入成功，您也想发送数据

  制作一个包装器并将数据和标志附加到它。序列化它和然后将其发送到客户端功能。即

  //wrapper class
  public class ServiceResponse
  {
     public bool IsSuccess {get;set;}
     public string Message {get;set;}
  }
  

  现在在你的 save 中执行此操作:

  [WebMethod(EnableSession = true)]
  public static string Save(string details)
  {
        ServiceResponse serviceResponse =new ServiceResponse();
  
        /// rest of the usual code of yours   
        ///
        if (a< b)
        {
           //rest of the code
            serviceResponse.IsSuccess= true;
            serviceResponse.Message = String.Join(",",data.ToArray());
        }
        else
        {
           //rest of the code
           serviceResponse.IsSuccess = false;
        }
  
      return new JavaScriptSerializer().Serialize(serviceResponse);
  }
  

  并在您的客户端方法中使用它，例如:

    success: function (result) {
            var jsonData = $.parseJSON(result.d);
            if(jsonData.IsSuccess){
                alert('success');
                grid.data(jsonData.Message);
            }
            else{
                alert('failure');
            } 
    }