Ajax异步(JQuery获取Json)2

来源：互联网发布：乐乎lofter手机版编辑：程序博客网时间：2024/06/05 09:20

首先创建一个一般处理程序“ResponseJson.ashx”，手动拼接字符串返回Json格式：

public void ProcessRequest(HttpContext context)
        {
            context.Response.ContentType = "text/plain";
            List<cityInfo> cityInfos = new List<cityInfo>()
            {
              new cityInfo(){cityID=1,cityName="北京"},
              new cityInfo(){cityID=2,cityName="上海"},
              new cityInfo(){cityID=3,cityName="南京"},
              new cityInfo(){cityID=4,cityName="深圳"},
              new cityInfo(){cityID=5,cityName="广州"}
            };

            StringBuilder sb = new StringBuilder();
            sb.Append("[");
            foreach (cityInfo cityInfo in cityInfos)
            {
                    sb.Append("{");
                    sb.AppendFormat("\"cityID\":{0},\"cityName\":\"{1}\"", cityInfo.cityID, cityInfo.cityName);
                    sb.Append("}");
                    sb.Append(",");
            }
            string str = sb.ToString().TrimEnd(',');
            str += "]";

context.Response.Write(str);

// 或者将对象序列化成Json格式和拼接相比这种方式较为死板

            //System.Web.Script.Serialization.JavaScriptSerializer JSSerializer = new JavaScriptSerializer();
            //string Json = JSSerializer.Serialize(cityInfos);
            //context.Response.Write(Json);

}

        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
    }

    public class cityInfo
    {
        public string cityName
        {
            get;
            set;
        }

        public int cityID
        {
            get;
            set;
        }

}

创建一个html页“JqueryGetJson.htm” 并且引入JQuery

// Jquery获取JSon

返回结果：“上海”