ASP.NET Tutorial/Cache/Page Output Cache

Содержание

1 Creating Page Output Cache Profiles
2 Manipulating the Page Output Cache Programmatically
3 OutputCache Duration="20" VaryByParam="None"
4 Varying the Output Cache by a Custom Function
5 Varying the Output Cache by Browser
6 Varying the Output Cache by Control
7 Varying the Output Cache by Header
8 Varying the Output Cache by Parameter
9 You enable Page Output Caching by adding an <%@ OutputCache %> directive to a page.

Creating Page Output Cache Profiles

   <source lang="csharp">

Configure Page Output Caching in a web configuration file and apply the settings to multiple pages. You can set the same caching properties in a Cache Profile as you can set in an individual page"s <%@ OutputCache %> directive. A Cache Profile named Cache1Hour that caches a page for one hour. File: Web.Config <configuration>

 <system.web>
   <caching>
     <outputCacheSettings>
       <outputCacheProfiles>
         <add name="Cache1Hour" duration="3600" varyByParam="none" />
       </outputCacheProfiles>
     </outputCacheSettings>
   </caching>
 </system.web>

</configuration>

File: Default.aspx <%@ Page Language="C#" %> <%@ OutputCache CacheProfile="Cache1Hour" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"

 "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

   <title>Output Cache Profile</title>

</head> <body>

   <form id="form1" runat="server">

   <%= DateTime.Now.ToString("T") %>

   </form>

</body> </html></source>

Manipulating the Page Output Cache Programmatically

   <source lang="csharp">

HttpCachePolicy class can perform all the tasks that you can perform with the <%@ OutputCache %> directive. The page is cached on the browser, proxy servers, and web server for 15 seconds. File: Default.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">

   void Page_Load()
   {
       Response.Cache.SetCacheability(HttpCacheability.Public);
       Response.Cache.SetExpires(DateTime.Now.AddSeconds(15));
       Response.Cache.SetMaxAge(TimeSpan.FromSeconds(15));
       Response.Cache.SetValidUntilExpires(true);
       Response.Cache.SetLastModified(DateTime.Now);
       Response.Cache.SetOmitVaryStar(true);
   }

</script> <html xmlns="http://www.w3.org/1999/xhtml" > <head id="Head1" runat="server">

   <title>Program OutputCache</title>

</head> <body>

   <form id="form1" runat="server">

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


   <a href="Default.aspx">Request this Page</a>

   </form>

</body> </html></source>

OutputCache Duration="20" VaryByParam="None"

   <source lang="csharp">

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="OutputCaching" %> <%@ OutputCache Duration="20" VaryByParam="None" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server">

   <title>Untitled Page</title>

</head> <body>

   <form id="form1" runat="server">

       <asp:Label ID="lblDate" runat="server" EnableViewState="False" Font-Bold="True" Font-Size="X-Large"></asp:Label>

   </form>

</body> </html> File: Default.aspx.cs using System; using System.Data; using System.Configuration; using System.Collections; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Web.UI.HtmlControls; public partial class OutputCaching : System.Web.UI.Page {

   protected void Page_Load(object sender, EventArgs e)
   {
       lblDate.Text = "The time is now:
";
       lblDate.Text += DateTime.Now.ToString();
   }

}</source>

Varying the Output Cache by a Custom Function

   <source lang="csharp">

You create the custom function in the Global.asax file by overriding the GetVaryByCustomString() method. File: Global.asax <%@ Application Language="C#" %> <script runat="server">

   public override string GetVaryByCustomString(HttpContext context, string custom)
   {
       if (String.rupare(custom, "css") == 0)
       {
           return Request.Browser.SupportsCss.ToString();
       }
       return base.GetVaryByCustomString(context, custom);
   }

</script>

File: Default.aspx <%@ Page Language="C#" %> <%@ OutputCache Duration="3600" VaryByParam="none" VaryByCustom="css" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <script runat="server">

   void Page_Load()
   {
       if (Request.Browser.SupportsCss)
           pnlCss.Visible = true;
       else
           pnlNotCss.Visible = true;
   }

</script> <html xmlns="http://www.w3.org/1999/xhtml" > <head id="Head1" runat="server">

   <title>Vary By Custom</title>

</head> <body>

   <form id="form1" runat="server">

   <asp:Panel
       id="pnlCss"
       Visible="false"
       Runat="server">
       Hello!
   </asp:Panel>
   <asp:Panel
       id="pnlNotCss"
       Visible="false"
       Runat="server">
       Hello!
   </asp:Panel>

   </form>

</body> </html></source>

Varying the Output Cache by Browser

   <source lang="csharp">

<%@ Page Language="C#" %> <%@ OutputCache Duration="3600" VaryByParam="none" VaryByCustom="browser" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"

  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

   <title>Vary By Browser</title>

</head> <body>

   <form id="form1" runat="server">

   <%= DateTime.Now.ToString("T") %>

   <%= Request.UserAgent %>

   </form>

</body> </html></source>

Varying the Output Cache by Control

   <source lang="csharp">

File: MasterDetails.aspx <%@ Page Language="C#" %> <%@ OutputCache Duration="3600" VaryByControl="dropCategories" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"

 "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

   <title>Master/Details</title>

</head> <body>

   <form id="form1" runat="server">

   <%= DateTime.Now.ToString("T") %>

   <asp:DropDownList
       id="dropCategories"
       DataSourceID="srcCategories"
       DataTextField="Name"
       DataValueField="Id"
       Runat="server" />
   <asp:Button
       id="btnSelect"
       Text="Select"
       Runat="server" />
   


   <asp:GridView
       id="grdProducts"
       DataSourceID="srcProducts"
       GridLines="none"
       Runat="server" />
   <asp:SqlDataSource
       id="srcCategories"
       ConnectionString="<%$ ConnectionStrings:Products %>"
       SelectCommand="SELECT Id,Name FROM ProductCategories"
       Runat="server" />
   <asp:SqlDataSource
       id="srcProducts"
       ConnectionString="<%$ ConnectionStrings:Products %>"
       SelectCommand="SELECT Title,Director FROM Products
           WHERE CategoryId=@CategoryId"
       Runat="server">
       <SelectParameters>
       <asp:ControlParameter
           Name="CategoryId"
           ControlID="dropCategories" />
       </SelectParameters>
   </asp:SqlDataSource>

   </form>

</body> </html></source>

Varying the Output Cache by Header

   <source lang="csharp">

Use the VaryByHeader to create new cached versions of a page in case of new browser header changes. Several standard browser headers are transmitted with each page request, including Accept-Language: a list of languages. User-Agent: type of device making the request. Cookie: the browser cookies created in the current domain. <%@ Page Language="C#" %> <%@ OutputCache Duration="3600" VaryByParam="none" VaryByHeader="User-Agent" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"

 "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

   <title>Vary By Header</title>

</head> <body>

   <form id="form1" runat="server">

   <%= DateTime.Now.ToString("T") %>

   <%= Request.UserAgent %>

   </form>

</body> </html></source>

Varying the Output Cache by Parameter

   <source lang="csharp">

The VaryByParam attribute causes a new instance of a page to be cached when a different parameter is passed to the page. File: Master.aspx <%@ Page Language="C#" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"

"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

   <title>Master</title>

</head> <body>

   <form id="form1" runat="server">

   <asp:GridView
       id="grdProducts"
       DataSourceID="srcProducts"
       AutoGenerateColumns="false"
       ShowHeader="false"
       GridLines="none"
       Runat="server">
       <Columns>
       <asp:HyperLinkField
           DataTextField="Title"
           DataNavigateUrlFields="Id"
           DataNavigateUrlFormatString="~/Details.aspx?id={0}" />
       </Columns>
   </asp:GridView>
   <asp:SqlDataSource
       id="srcProducts"
       ConnectionString="<%$ ConnectionStrings:Products %>"
       SelectCommand="SELECT Id,Title FROM Products"
       Runat="server" />

   </form>

</body> </html> File: Details.aspx <%@ Page Language="C#" %> <%@ OutputCache Duration="3600" VaryByParam="id" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"

 "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

   <title>Details</title>

</head> <body>

   <form id="form1" runat="server">

   <%= DateTime.Now.ToString("T") %>

   <asp:DetailsView
       id="dtlProduct"
       DataSourceID="srcProducts"
       Runat="server" />
   <asp:SqlDataSource
       id="srcProducts"
       ConnectionString="<%$ ConnectionStrings:Products %>"
       SelectCommand="SELECT * FROM Products
           WHERE Id=@Id"
       Runat="server">
       <SelectParameters>
           <asp:QueryStringParameter
               Name="Id"
               Type="int32"
               QueryStringField="Id" />
       </SelectParameters>
   </asp:SqlDataSource>

   </form>

</body> </html> You can assign two special values to the VaryByParam attribute: none: causes any query string or form parameters to be ignored.

caches a new cached version whenever there is a change in query string or form parameter passed to the page.

You can assign a semicolon-delimited list of parameters to the VaryByParam attribute.</source>

You enable Page Output Caching by adding an <%@ OutputCache %> directive to a page.

   <source lang="csharp">

The following page caches its contents for 15 seconds. <%@ Page Language="C#" %> <%@ OutputCache Duration="15" VaryByParam="none" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <script runat="server">

   void Page_Load()
   {
       lblTime.Text = DateTime.Now.ToString("T");
   }

</script> <html xmlns="http://www.w3.org/1999/xhtml" > <head id="Head1" runat="server">

   <title>Cache Page Output</title>

</head> <body>

   <form id="form1" runat="server">

   <asp:Label
       id="lblTime"
       Runat="server" />

   </form>

</body> </html></source>

ASP.NET Tutorial/Cache/Page Output Cache

Содержание

Creating Page Output Cache Profiles

Manipulating the Page Output Cache Programmatically

OutputCache Duration="20" VaryByParam="None"

Varying the Output Cache by a Custom Function

Varying the Output Cache by Browser

Varying the Output Cache by Control

Varying the Output Cache by Header

Varying the Output Cache by Parameter

You enable Page Output Caching by adding an <%@ OutputCache %> directive to a page.

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