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ASP.NET Tutorial/Cache/Page Output Cache - История изменений
2026-04-29T20:07:13Z
История изменений этой страницы в вики
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http://nfex.ru/index.php?title=ASP.NET_Tutorial/Cache/Page_Output_Cache&diff=2903&oldid=prev
в 15:30, 26 мая 2010
2010-05-26T15:30:57Z
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Admin: 1 версия
2010-05-26T11:57:26Z
<p>1 версия</p>
<p><b>Новая страница</b></p><div>== Creating Page Output Cache Profiles==<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="csharp"><br />
Configure Page Output Caching in a web configuration file and apply the settings to multiple pages. <br />
You can set the same caching properties in a Cache Profile as you can set in an individual page"s <%@ OutputCache %> directive. <br />
A Cache Profile named Cache1Hour that caches a page for one hour.<br />
File: Web.Config<br />
<configuration><br />
<system.web><br />
<caching><br />
<outputCacheSettings><br />
<outputCacheProfiles><br />
<add name="Cache1Hour" duration="3600" varyByParam="none" /><br />
</outputCacheProfiles><br />
</outputCacheSettings><br />
</caching><br />
</system.web><br />
</configuration><br />
<br />
File: Default.aspx<br />
<%@ Page Language="C#" %><br />
<%@ OutputCache CacheProfile="Cache1Hour" %><br />
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"<br />
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><br />
<html xmlns="http://www.w3.org/1999/xhtml" ><br />
<head id="Head1" runat="server"><br />
<title>Output Cache Profile</title><br />
</head><br />
<body><br />
<form id="form1" runat="server"><br />
<div><br />
<%= DateTime.Now.ToString("T") %><br />
</div><br />
</form><br />
</body><br />
</html></source><br />
<br />
<br />
<br />
== Manipulating the Page Output Cache Programmatically==<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="csharp"><br />
HttpCachePolicy class can perform all the tasks that you can perform with the <%@ OutputCache %> directive. <br />
The page is cached on the browser, proxy servers, and web server for 15 seconds.<br />
File: Default.aspx<br />
<%@ Page Language="C#" %><br />
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"<br />
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><br />
<script runat="server"><br />
void Page_Load()<br />
{<br />
Response.Cache.SetCacheability(HttpCacheability.Public);<br />
Response.Cache.SetExpires(DateTime.Now.AddSeconds(15));<br />
Response.Cache.SetMaxAge(TimeSpan.FromSeconds(15));<br />
Response.Cache.SetValidUntilExpires(true);<br />
Response.Cache.SetLastModified(DateTime.Now);<br />
Response.Cache.SetOmitVaryStar(true);<br />
}<br />
</script><br />
<html xmlns="http://www.w3.org/1999/xhtml" ><br />
<head id="Head1" runat="server"><br />
<title>Program OutputCache</title><br />
</head><br />
<body><br />
<form id="form1" runat="server"><br />
<div><br />
<%= DateTime.Now.ToString("T") %><br />
<br /><br /><br />
<a href="Default.aspx">Request this Page</a><br />
</div><br />
</form><br />
</body><br />
</html></source><br />
<br />
<br />
<br />
== OutputCache Duration="20" VaryByParam="None"==<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="csharp"><br />
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="OutputCaching" %><br />
<%@ OutputCache Duration="20" VaryByParam="None" %><br />
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"><br />
<html xmlns="http://www.w3.org/1999/xhtml" ><br />
<head runat="server"><br />
<title>Untitled Page</title><br />
</head><br />
<body><br />
<form id="form1" runat="server"><br />
<div><br />
<asp:Label ID="lblDate" runat="server" EnableViewState="False" Font-Bold="True" Font-Size="X-Large"></asp:Label><br />
</div><br />
</form><br />
</body><br />
</html><br />
File: Default.aspx.cs<br />
using System;<br />
using System.Data;<br />
using System.Configuration;<br />
using System.Collections;<br />
using System.Web;<br />
using System.Web.Security;<br />
using System.Web.UI;<br />
using System.Web.UI.WebControls;<br />
using System.Web.UI.WebControls.WebParts;<br />
using System.Web.UI.HtmlControls;<br />
public partial class OutputCaching : System.Web.UI.Page<br />
{<br />
protected void Page_Load(object sender, EventArgs e)<br />
{<br />
lblDate.Text = "The time is now:<br />";<br />
lblDate.Text += DateTime.Now.ToString();<br />
}<br />
}</source><br />
<br />
<br />
<br />
== Varying the Output Cache by a Custom Function==<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="csharp"><br />
You create the custom function in the Global.asax file by overriding the GetVaryByCustomString() method. <br />
File: Global.asax<br />
<%@ Application Language="C#" %><br />
<script runat="server"><br />
public override string GetVaryByCustomString(HttpContext context, string custom)<br />
{<br />
if (String.rupare(custom, "css") == 0)<br />
{<br />
return Request.Browser.SupportsCss.ToString();<br />
}<br />
return base.GetVaryByCustomString(context, custom);<br />
}<br />
</script><br />
<br />
File: Default.aspx<br />
<%@ Page Language="C#" %><br />
<%@ OutputCache Duration="3600" VaryByParam="none" VaryByCustom="css" %><br />
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"<br />
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><br />
<script runat="server"><br />
void Page_Load()<br />
{<br />
if (Request.Browser.SupportsCss)<br />
pnlCss.Visible = true;<br />
else<br />
pnlNotCss.Visible = true;<br />
}<br />
</script><br />
<html xmlns="http://www.w3.org/1999/xhtml" ><br />
<head id="Head1" runat="server"><br />
<title>Vary By Custom</title><br />
</head><br />
<body><br />
<form id="form1" runat="server"><br />
<div><br />
<asp:Panel<br />
id="pnlCss"<br />
Visible="false"<br />
Runat="server"><br />
<span style="font-weight:bold">Hello!</span><br />
</asp:Panel><br />
<asp:Panel<br />
id="pnlNotCss"<br />
Visible="false"<br />
Runat="server"><br />
<b>Hello!</b><br />
</asp:Panel><br />
</div><br />
</form><br />
</body><br />
</html></source><br />
<br />
<br />
<br />
== Varying the Output Cache by Browser==<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="csharp"><br />
<%@ Page Language="C#" %><br />
<%@ OutputCache Duration="3600" VaryByParam="none" VaryByCustom="browser" %><br />
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"<br />
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><br />
<html xmlns="http://www.w3.org/1999/xhtml" ><br />
<head id="Head1" runat="server"><br />
<title>Vary By Browser</title><br />
</head><br />
<body><br />
<form id="form1" runat="server"><br />
<div><br />
<%= DateTime.Now.ToString("T") %><br />
<hr /><br />
<%= Request.UserAgent %><br />
</div><br />
</form><br />
</body><br />
</html></source><br />
<br />
<br />
<br />
== Varying the Output Cache by Control==<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="csharp"><br />
File: MasterDetails.aspx<br />
<%@ Page Language="C#" %><br />
<%@ OutputCache Duration="3600" VaryByControl="dropCategories" %><br />
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"<br />
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><br />
<html xmlns="http://www.w3.org/1999/xhtml" ><br />
<head id="Head1" runat="server"><br />
<title>Master/Details</title><br />
</head><br />
<body><br />
<form id="form1" runat="server"><br />
<div><br />
<%= DateTime.Now.ToString("T") %><br />
<hr /><br />
<asp:DropDownList<br />
id="dropCategories"<br />
DataSourceID="srcCategories"<br />
DataTextField="Name"<br />
DataValueField="Id"<br />
Runat="server" /><br />
<asp:Button<br />
id="btnSelect"<br />
Text="Select"<br />
Runat="server" /><br />
<br /><br /><br />
<asp:GridView<br />
id="grdProducts"<br />
DataSourceID="srcProducts"<br />
GridLines="none"<br />
Runat="server" /><br />
<asp:SqlDataSource<br />
id="srcCategories"<br />
ConnectionString="<%$ ConnectionStrings:Products %>"<br />
SelectCommand="SELECT Id,Name FROM ProductCategories"<br />
Runat="server" /><br />
<asp:SqlDataSource<br />
id="srcProducts"<br />
ConnectionString="<%$ ConnectionStrings:Products %>"<br />
SelectCommand="SELECT Title,Director FROM Products<br />
WHERE CategoryId=@CategoryId"<br />
Runat="server"><br />
<SelectParameters><br />
<asp:ControlParameter<br />
Name="CategoryId"<br />
ControlID="dropCategories" /><br />
</SelectParameters><br />
</asp:SqlDataSource><br />
</div><br />
</form><br />
</body><br />
</html></source><br />
<br />
<br />
<br />
== Varying the Output Cache by Header==<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="csharp"><br />
Use the VaryByHeader to create new cached versions of a page in case of new browser header changes. <br />
Several standard browser headers are transmitted with each page request, including<br />
Accept-Language: a list of languages.<br />
User-Agent: type of device making the request.<br />
Cookie: the browser cookies created in the current domain.<br />
<%@ Page Language="C#" %><br />
<%@ OutputCache Duration="3600" VaryByParam="none" VaryByHeader="User-Agent" %><br />
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"<br />
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><br />
<html xmlns="http://www.w3.org/1999/xhtml" ><br />
<head id="Head1" runat="server"><br />
<title>Vary By Header</title><br />
</head><br />
<body><br />
<form id="form1" runat="server"><br />
<div><br />
<%= DateTime.Now.ToString("T") %><br />
<hr /><br />
<%= Request.UserAgent %><br />
</div><br />
</form><br />
</body><br />
</html></source><br />
<br />
<br />
<br />
== Varying the Output Cache by Parameter==<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="csharp"><br />
The VaryByParam attribute causes a new instance of a page to be cached when a different parameter is passed to the page. <br />
File: Master.aspx<br />
<%@ Page Language="C#" %><br />
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"<br />
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><br />
<html xmlns="http://www.w3.org/1999/xhtml" ><br />
<head id="Head1" runat="server"><br />
<title>Master</title><br />
</head><br />
<body><br />
<form id="form1" runat="server"><br />
<div><br />
<asp:GridView<br />
id="grdProducts"<br />
DataSourceID="srcProducts"<br />
AutoGenerateColumns="false"<br />
ShowHeader="false"<br />
GridLines="none"<br />
Runat="server"><br />
<Columns><br />
<asp:HyperLinkField<br />
DataTextField="Title"<br />
DataNavigateUrlFields="Id"<br />
DataNavigateUrlFormatString="~/Details.aspx?id={0}" /><br />
</Columns><br />
</asp:GridView><br />
<asp:SqlDataSource<br />
id="srcProducts"<br />
ConnectionString="<%$ ConnectionStrings:Products %>"<br />
SelectCommand="SELECT Id,Title FROM Products"<br />
Runat="server" /><br />
</div><br />
</form><br />
</body><br />
</html><br />
File: Details.aspx<br />
<%@ Page Language="C#" %><br />
<%@ OutputCache Duration="3600" VaryByParam="id" %><br />
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"<br />
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><br />
<html xmlns="http://www.w3.org/1999/xhtml" ><br />
<head id="Head1" runat="server"><br />
<title>Details</title><br />
</head><br />
<body><br />
<form id="form1" runat="server"><br />
<div><br />
<%= DateTime.Now.ToString("T") %><br />
<hr /><br />
<asp:DetailsView<br />
id="dtlProduct"<br />
DataSourceID="srcProducts"<br />
Runat="server" /><br />
<asp:SqlDataSource<br />
id="srcProducts"<br />
ConnectionString="<%$ ConnectionStrings:Products %>"<br />
SelectCommand="SELECT * FROM Products<br />
WHERE Id=@Id"<br />
Runat="server"><br />
<SelectParameters><br />
<asp:QueryStringParameter<br />
Name="Id"<br />
Type="int32"<br />
QueryStringField="Id" /><br />
</SelectParameters><br />
</asp:SqlDataSource><br />
</div><br />
</form><br />
</body><br />
</html><br />
You can assign two special values to the VaryByParam attribute:<br />
none: causes any query string or form parameters to be ignored. <br />
<br />
*: caches a new cached version whenever there is a change in query string or form parameter passed to the page.<br />
You can assign a semicolon-delimited list of parameters to the VaryByParam attribute.</source><br />
<br />
<br />
<br />
== You enable Page Output Caching by adding an <%@ OutputCache %> directive to a page.==<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="csharp"><br />
The following page caches its contents for 15 seconds.<br />
<%@ Page Language="C#" %><br />
<%@ OutputCache Duration="15" VaryByParam="none" %><br />
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"<br />
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><br />
<script runat="server"><br />
void Page_Load()<br />
{<br />
lblTime.Text = DateTime.Now.ToString("T");<br />
}<br />
</script><br />
<html xmlns="http://www.w3.org/1999/xhtml" ><br />
<head id="Head1" runat="server"><br />
<title>Cache Page Output</title><br />
</head><br />
<body><br />
<form id="form1" runat="server"><br />
<div><br />
<asp:Label<br />
id="lblTime"<br />
Runat="server" /><br />
</div><br />
</form><br />
</body><br />
</html></source></div>
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