HttpContext.Cache属性

Posted 2020-08-15 坚持不懈,才能出彩

      HttpContext基于HttpApplication的处理管道，由于HttpContext对象贯穿整个处理过程，所以，可以从HttpApplication处理管道的前端将状态数据传递到管道的后端，完成状态的传递任务做个小demo

1.控制器：

  public class TestController : Controller
    {

        string key = "data";

        public ActionResult Index()
        {
            return View();
        }


        /// <summary>
        /// 定时器获取缓存数据
        /// </summary>
        /// <returns></returns>
        [HttpPost]

        public JsonResult GetData()
        {
            string data = Convert.ToString(HttpContext.Cache.Get(this.key));
           if (!string.IsNullOrEmpty(data))
           {
               return this.Json(new { success = true, data = data });
           }
           else
           {
               return this.Json(new { success = false, time = DateTime.Now.ToString("ss"), data = data });
           }
        }

        /// <summary>
        /// 打开输入缓存值界面
        /// </summary>
        /// <returns></returns>
        [HttpGet]
        public ActionResult CreateCacheData()
        {
            return View();
        }


        /// <summary>
        /// 将数据插入缓存
        /// </summary>
        /// <param name="value"></param>
        /// <returns></returns>
        [HttpPost]
        public void InsertCache(string value)
        {
            HttpContext.Cache.Insert(this.key, value);        
 
        }

    }

2.视图

Index.cshtml:

@{
    ViewBag.Title = "Index";
    Layout = null;

}
<script src="~/Scripts/jquery-1.8.2.min.js"></script>
<script src="~/Scripts/jquery.timers-1.2.js"></script>


<button id="btnStart">开始定时器</button>
<script>
    $(function ()
    {
        //定时器开始
        $("#btnStart").bind("click", function () {
            $("body").everyTime("3s", "timer", function () {
                $.ajax(
                    {
                        type: \'post\',
                        url: \'/Test/GetData\',
                        success: function (r) {
                            if (r.success) {
                                console.log("获取到数据,json字符串为" + JSON.stringify(r.data));
                            }
                            else {
                                console.log("(" +r.time + ")秒没有获取到数据");
                            }
                        }

                    });
            })
        });

     
    })
</script>

jquery.timers-1.2.js 是定时器jquery插件
定时器插件下载

CreateCacheData.cshtml:

@{
    ViewBag.Title = "CreateCacheData";
}
<script src="~/Scripts/jquery-1.8.2.min.js"></script>
<input id="txtData"/>
<button id="btnSave" >
    插入服务器缓存
</button>

<script>
    $(function () {
        $("#btnSave").click(function ()
        {
            var getDataValue = $("#txtData").val();
            $.post("/Test/InsertCache", {value:getDataValue}, function () {
                alert("缓存插入成功");
            });
        })
    });
</script>

3.效果

，