如何發送JSON數據

Question

我的sendig JSON對象strid如下：

var strid = "{id:'"+val.id+"'}"; 
     $.ajax({ 
      type: "POST", 
      url: "FrmUserPortal.aspx/AnnounceInfo", 
      data:JSON.stringify(strid), 
      contentType: "application/json; charset=utf-8", 
      dataType: "json", 
      success: function (data) { 

       var mydata = data.d; 
       alert(mydata); 

      }, 
      error: function (XMLHttpRequest, textStatus, errorThrown) { 
       alert("Request: " + XMLHttpRequest.toString() + "\n\nStatus: " + textStatus + "\n\nError: " + errorThrown); 
      }, 
     }); 

但將WebMethod並沒有叫。我的方法是

[WebMethod] 
    [ScriptMethod(UseHttpGet = false)] 
    public static Announce AnnounceInfo(string Id) 
    { 
     string dgFill = "Select AnnounceTitle,AnnounceDescription From AnnouncementInformation Where AnnouncetId = '"+Id+"'"; 
     DataTable dtFill = DataManager.ExecuteQuery(dgFill); 

     Announce An = new Announce(); 
     if (dtFill.Rows.Count > 0) 
     { 

      An.AnnounceTitle = dtFill.Rows[0]["AnnounceTitle"].ToString(); 
      An.AnnounceDescription=dtFill.Rows[0]["AnnounceDescription"].ToString(); 

      return An; 
     } 

     return An; 

    } 
public class Announce 
    { 
     public string AnnounceTitle { get;set;} 
     public string AnnounceDescription { get; set; } 

    } 

Answer 1

您使用Json.stringify，但您發送一個字符串作爲參數。嘗試創建這樣的對象：

var strid = {"Id": val.id }; 

Answer 2

能否請您參考以下鏈接：
Web method is not called by jquery from javascript function？

我希望它會幫助並嘗試返回一個JSON對象。