14、使用部分页面缓存

使用部分页面缓存

1、使用缓存后替换
AdRotator控件的内部使用了缓存后替换。
使用Substitution控件

SubstitutionControl.aspx
<%@ Page Language="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
    public static string GetTime(HttpContext context)
    {
        return DateTime.Now.ToString("T");
    }
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        The cache time is :<%=DateTime.Now.ToString("T") %>
        <hr />
        The substitution time is:
        <asp:Substitution ID="Substitution1" MethodName="GetTime" runat="server" />
    </div>
    </form>
</body>
</html>


以编程方式使用Response.WriteSubstitution();

ShowWriteSubstitution.aspx
<%@ Page Language="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
    public static string GetTime(HttpContext context)
    {
        return DateTime.Now.ToString("T");
    }
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        The cache time is :<%=DateTime.Now.ToString("T") %>
        <hr />
        The substitution time is:
        <%   Response.WriteSubstitution(GetTime); %>
    </div>
    </form>
</body>
</html>


2011-5-28 22:26 danny

2、用户控件缓存
缓存Asp.net页面一样在内存中缓存用户控件呈现的内容。
不给用户控件添加<%@OutputCache%>指令时,用户控件的输出内容就会缓存。

注意:
当缓存一个用户控件时,内容缓存在Web服务器上,而不是缓存在代理服务器和浏览器上。当代理服务器或浏览器缓存页面时,它们总是缓存整个页面。

Movies.ascx
<%@ Control Language="C#" ClassName="Movies" %>
<%@ OutputCache Duration="600" VaryByParam="none" %>
<script runat="server">

</script>

User Control Time:

<%=DateTime.Now.ToString("T") %>

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" 
    DataSourceID="SqlDataSource1">
    <Columns>
        <asp:BoundField DataField="id" HeaderText="id" InsertVisible="False" 
            ReadOnly="True" SortExpression="id" />
        <asp:BoundField DataField="Title" HeaderText="Title" SortExpression="Title" />
        <asp:BoundField DataField="Director" HeaderText="Director" 
            SortExpression="Director" />
        <asp:BoundField DataField="DateReleased" HeaderText="DateReleased" 
            SortExpression="DateReleased" />
        <asp:BoundField DataField="Description" HeaderText="Description" 
            SortExpression="Description" />
    </Columns>
</asp:GridView>
<asp:SqlDataSource ID="SqlDataSource1" runat="server" 
    ConnectionString="<%$ ConnectionStrings:ConnectionString %>" 
    SelectCommand="SELECT * FROM [Movies]"></asp:SqlDataSource>


ShowUserControlCache.aspx
<%@ Page Language="C#" %>

<%@ Register TagPrefix="user" TagName="Movies" Src="~/Movies.ascx" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">

</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        Page Time:
        <%=DateTime.Now.ToString("T") %>
        <hr />
        <user:Movies ID="Movies" runat="server" />
    </div>
    </form>
</body>
</html>


2011-5-29 19:10 danny

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