Question

我从ajax调用WebMethod，试图遍历返回的数据。返回的数据是“{BusinessTypeID = 2}”。我想弄清楚如何获得值2？

        //Function called from ajax
[System.Web.Services.WebMethod]
public static string[] GetTerminalBusinessTypes(string terminalID)
{
    DataClassesDataContext db = new DataClassesDataContext();
    List<string> results = new List<string>();

    try
    {

        var terminalBusinessTypes = (from bt in db.BusinessTypes
                                    join obt in db.OxygenateBlenderBusinessTypes on bt.BusinessTypeID equals obt.BusinessTypeID
                                    where obt.OxygenateBlenderID == Convert.ToInt32(terminalID)
                                    select new
                                    {
                                        bt.BusinessTypeID
                                    }).ToList();


        for (int i = 0; i < terminalBusinessTypes.Count(); i++)
        {
            results.Add(terminalBusinessTypes[i].ToString());
        }

    }
    catch (Exception ex)
    {

    }

    return results.ToArray();
}

ajax功能：

            function PopulateTerminalBusinessTypes(terminalID) {

        $.ajax({
            type: "POST",
            url: "OxygenateBlenderCertificationApplication.aspx/GetTerminalBusinessTypes",
            data: "{'terminalID':" + terminalID + "}",
            contentType: "application/json; charset=utf-8",
            dataType: "json",
            success: function (data) {

                var targetValue = data.d;

                var items = $('#cblTerminalBusinessType input:checkbox');



                                    $.each(targetValue, function (key, targetValue) {
                                        alert(data[index].BusinessTypeID);
                                    });
                    }
        })//end ajax

    }

Answer 1

说实话，我看不到你的“索引”的定义。

警报线不应该读

$each(targetVale, function(key, item) {
   // on second look, this wont work as you are converting toString()
   alert(targetValue[key].BusinessTypeId)
   // this should
   alert(item)
});

你也可以抛出一个调试器;警报上方的行，并查看正在遍历的值。

Answer 2

当您的Web服务返回json值时，asp.net会包装一个对象，其中键为d，值为您的json字符串。查看this link了解详情。

您必须将值字符串解析为json对象。使用jQuery（v1.4.1或更高版本）：

jQuery.parseJSON(targetValue);

Answer 3

您可能想尝试从C＃返回JSON字符串：

public static **string** GetTerminalBusinessTypes(string terminalID)
...
var oSerializer = new System.Web.Script.Serialization.JavaScriptSerializer();
string sJSON = oSerializer.Serialize(results);
return sJSON;

迭代JSOn结果

3 个答案: