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<%@ Import Namespace="System.IO" %>
<%@ Import Namespace="System.Data" %>
<html>
<script language="C#" runat="server">
void Page_Load(Object Src, EventArgs E ) {
if(!IsPostBack) {
DataView Source = (DataView)Cache["MyData"];
//如果缓存中存在的话，从缓存中取出，否则从xml文件中读出
if(Source == null) {
DataSet ds = new DataSet();
FileStream fs = new FileStream(Server.MapPath("book.xml"), FileMode.Open,FileAccess.Read);
StreamReader reader = new StreamReader(fs);
ds.ReadXml(reader);
fs.Close();
Source = new DataView(ds.Tables[0]);
//往缓存中添加数据，并依存于book.xml文件
Cache.Insert("MyData", Source, new CacheDependency(Server.MapPath("book.xml")));
CacheMsg.Text = "生成数据";
}
else {
CacheMsg.Text = "从缓存中取出数据";
}
MyDataGrid.DataSource = Source;
MyDataGrid.DataBind();
}
}
</script>
<body>
<form runat="server">
<h3><font face="Verdana">缓存数据</font></h3>
<ASP:DataGrid id="MyDataGrid" runat="server"
BackColor="#ccccff"
BorderColor="black"
ShowFooter="false"
CellPadding=3
CellSpacing="0"
Font-Name="Verdana"
Font-Size="8pt"
HeaderStyle-BackColor="#aaaadd"
/>
<i><asp:label id="CacheMsg" runat="server"/></i></p>
</form>
</body>
</html>
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