Asp.net实现无刷新调用后台实体类数据并以Json格式返回

public class Temp
{
 public int Index { get; set; }
 public string Description { get; set; }
 public string ImagePath { get; set; }
 public DateTime MyDate { get; set; }
}

//数据源 
 List<Temp> listTemp = new List<Temp>()
 {
 new Temp(){ Index=1,ImagePath="Desert.jpg", Description="图片1",MyDate=DateTime.Now},
 new Temp(){Index=2,ImagePath="Chrysanthemum.jpg", Description="图片2",MyDate=DateTime.Now},
 new Temp(){Index=3,ImagePath="Penguins.jpg", Description="图片3",MyDate=DateTime.Now},
 new Temp(){Index=4,ImagePath="Jellyfish.jpg", Description="图片4",MyDate=DateTime.Now},
 new Temp(){Index=5,ImagePath="Tulips.jpg", Description="图片5",MyDate=DateTime.Now}
 };
 
 public void ProcessRequest(HttpContext context)
 {
 string index = context.Request["Index"];
 string jsonStr = string.Empty;
 foreach (var item in listTemp)
 {
 if (item.Index.ToString() == index)
 {
 JavaScriptSerializer serializer = new JavaScriptSerializer();
 jsonStr = serializer.Serialize(item); //序列化为json格式
 break;
 }
 }
 
 context.Response.Write(jsonStr);
 }

$.getJSON("imageChange.ashx", { Index: i - 1 }, function (result) {
 $("#<%=lblDescription.ClientID %>").text(result.Description);
$("#<%=Image1.ClientID %>").attr("src", path + result.ImagePath.substr(result.ImagePath.lastIndexOf('/') + 1));
 
 var d = eval("new " + result.MyDate.replace(/\//g, ""));
 $("#<%=lblDate.ClientID %>").text(Todate(d.ToLocalTime().toString()));
});