jQuery+Ajax实现限制查询间隔的方法

using System; using System.Web; using System.Web.SessionState; //Handler.ashx public class Handler : IHttpHandler,IRequiresSessionState { public void ProcessRequest(HttpContext context) { context.Response.ContentType = "text/plain"; string queryType = context.Request["queryType"]; string queryValue = context.Request["queryValue"]; if (context.Session["preQuery"] == null) //第一次查询 { context.Session["preQuery"] = queryValue + "@" + DateTime.Now.AddDays(-1); context.Session["currQuery"] = queryValue + "@" + DateTime.Now; } else //存在上次查询 { string[] preStrs = context.Session["currQuery"].ToString().Split('@'); context.Session["preQuery"] = queryValue + "@" + preStrs[1]; //重置为当前查询参数+上次查询时间 context.Session["currQuery"] = queryValue + "@" + DateTime.Now; } string[] strs=context.Session["preQuery"].ToString().Split('@'); if (strs[0] == queryValue) //同一请求限制查询间隔 { DateTime preTime = Convert.ToDateTime(strs[1]); DateTime nowTime = DateTime.Now; bool flag = CheckQueryTimeSpan(preTime,nowTime,3); if (flag) { context.Response.Write("查询间隔3秒"); } else { context.Response.Write("98"); } } context.Response.End(); } ///

/// 判断本次查询和上次查询间隔是否小于指定秒数 ///

/// /// /// /// public bool CheckQueryTimeSpan(DateTime preTime,DateTime nowTime,int timeSpan) { TimeSpan ts = nowTime - preTime; int difference = ts.Seconds; bool flag = (difference < timeSpan) ? true : false; return flag; } public bool IsReusable { get { return false; } } }