.NET缓存学习笔记

最新推荐文章于 2025-08-11 01:12:22 发布

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最新推荐文章于 2025-08-11 01:12:22 发布

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CC 4.0 BY-SA版权

文章标签： json 面试 xhtml

原文链接：http://www.cnblogs.com/Rock-Lee/p/4430308.html

本文通过一个简单的 ASP.NET 应用实例介绍了缓存机制的使用方法，并演示了如何利用缓存依赖项确保缓存内容的有效性。文章还探讨了缓存依赖项在实际应用中的行为特点。

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<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title></title>
    <script src="http://libs.baidu.com/jquery/2.1.1/jquery.min.js"></script>
    <script type="text/javascript">
        $(function () {
            $(':button').eq(0).click(function () {
                var key = $(":text").eq(0).val();
                var value = $(":text").eq(1).val();
                if (key != "" && value != "") {
                    var data = { action: "add", value: value, key: key };
                    $.post("ReturnValue.ashx", data, function (result) {
                        alert(result);
                    }, "json");
                }
            });

            $(":button").eq(1).click(function () {
                var data = { action: "selectCount" };
                $.post("ReturnValue.ashx", data, function (result) {
                    alert(result);
                }, "json");


            });

            $(":button").eq(2).click(function () {
                var data = { action: "file" };
                $.post("ReturnValue.ashx", data, function (result) {
                    var json = eval(result);
                    alert(json.word);
                }, "json");

            });


        });
    </script>

</head>
<body>
    <form id="form1" runat="server">
        <div>
            <table style="border: 2px solid blue">
                <tr>
                    <th>key
                    </th>
                    <td>
                        <input type="text" id="txt_key" /></td>

                </tr>
                <tr>
                    <th>value
                    </th>
                    <td>
                        <input type="text" id="txt_value" /></td>

                </tr>
                <tr>

                    <td>
                        <input type="button" value="设置" /></td>
                    <td>
                        <input type="button" value="数量" /></td>

                </tr>
            </table>
            <br />
            <input type="button" value="修改" />




            <div id="div">
            </div>









        </div>
    </form>
</body>
</html>

        public void ProcessRequest(HttpContext context)
        {
            //context.Response.ContentType = "text/plain";
            //context.Response.Write("Hello World");

            if (context.Request["action"] != null)
            {
                switch (context.Request["action"].ToString())
                {
                    case "add": add(); break;
                    case "selectCount": selectCount(); break;
                    case "file": file(); break;
                    default: break;
                }
            }
        }


        private void file()
        {
            FileInfo fi = new FileInfo("fuct.txt");
            StreamWriter sw = new StreamWriter(fi.FullName);
            sw.WriteLine(new Random().Next(100));
            sw.Flush();
            sw.WriteLine(new Random().Next(100));
            sw.Flush();
            sw.Close();
            sw.Dispose();

            StreamReader sr = new StreamReader(fi.FullName);
            string word = sr.ReadLine();
            sr.Close();
            sr.Dispose();
            string json = "{\"word\":\"" + word + "\"}";
            HttpContext.Current.Response.Write(json);
        }


        private void add()
        {
            TimeSpan ts = new TimeSpan(11, 0, 0);
            string value = HttpContext.Current.Request["value"].ToString();
            string key = HttpContext.Current.Request["key"].ToString();
            System.Web.Caching.Cache objCache = HttpRuntime.Cache;



            FileInfo fi = new FileInfo("fuct.txt");
            System.Web.Caching.CacheDependency file = new System.Web.Caching.CacheDependency(fi.FullName);

            objCache.Insert(key, value, file, DateTime.MaxValue, ts, System.Web.Caching.CacheItemPriority.NotRemovable, null);
            System.Web.Caching.Cache aa = HttpContext.Current.Cache;
            HttpContext.Current.Response.Write(aa.Count);
        }


        private void selectCount()
        {
            System.Web.Caching.Cache aa = HttpContext.Current.Cache;
            HttpContext.Current.Response.Write(aa.Count);


        }




        public bool IsReusable
        {
            get
            {
                return false;
            }
        }

最近几次面试都问及到了缓存这个东西，所以抽空简单的学习了下缓存用来存储一些

然后测试了下缓存中的CacheDependency 也就是缓存依赖项一旦依赖项改变缓存也随即清空这个可以用来储存一些配置信息一般配置到XML然后缓存这个XML一旦配置修改缓存就需要重新去读取

测试了下用一个txt来作为依赖项手动在文件夹里修改貌似不影响但是使用程序去修改这立即见效了缓存被清除了

转载于:https://www.cnblogs.com/Rock-Lee/p/4430308.html