.NET缓存学习笔记
<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
