ASP.NET Tutorial/Cache/Item Dependency
Содержание
cached with a dependency on an item in the cache named Products.
<source lang="csharp">
File: Default.aspx <%@ Page Language="C#" %> <%@ OutputCache Duration="3600" 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">
protected void Page_Load(object sender, EventArgs e) { Cache.Insert("Products", DateTime.Now); Response.AddCacheItemDependency("Products"); }
</script> <html xmlns="http://www.w3.org/1999/xhtml" > <head id="Head1" runat="server">
<title>Product List Key Dependency</title>
</head> <body>
<form id="form1" runat="server">
<%= DateTime.Now.ToString("T") %>
<asp:GridView id="grdProducts" DataSourceID="srcProducts" Runat="server" /> <asp:SqlDataSource id="srcProducts" ConnectionString="<%$ ConnectionStrings:Products %>" SelectCommand="SELECT Title, Director FROM Products" Runat="server" />
<a href="NextPage.aspx">Add Product</a>
</form>
</body> </html> File: NextPage.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">
protected void dtlProduct_ItemInserted(object sender, DetailsViewInsertedEventArgs e) { Cache.Remove("Products"); Response.Redirect("~/Default.aspx"); }
</script> <html xmlns="http://www.w3.org/1999/xhtml" > <head id="Head1" runat="server">
<title>Add Product Key Dependency</title>
</head> <body>
<form id="form1" runat="server">
Add Product
<asp:DetailsView id="dtlProduct" DefaultMode="Insert" DataSourceID="srcProducts" AutoGenerateRows="false" AutoGenerateInsertButton="true" Runat="server" OnItemInserted="dtlProduct_ItemInserted"> <Fields> <asp:BoundField DataField="Title" HeaderText="Title:" /> <asp:BoundField DataField="Director" HeaderText="Director:" /> </Fields> </asp:DetailsView> <asp:SqlDataSource id="srcProducts" ConnectionString="<%$ ConnectionStrings:Products %>" InsertCommand="INSERT Products (Title, Director) VALUES (@Title, @Director)" Runat="server" />
</form>
</body> </html></source>
Object Caching Item Dependency
<source lang="csharp">
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="Default_aspx" %> <!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>Object Caching</title>
</head> <body>
<form id="form1" runat="server">
Object Caching
Item Dependency
<asp:Label ID="lblMessage" runat="server" />
<asp:GridView ID="gv" runat="server" />
<asp:Button ID="btnClear" runat="server" Text="Clear Cache" OnClick="btnClear_Click" /> <asp:Button ID="btnPost" runat="server" Text="Post" />
<asp:Button ID="btnInit" runat="server" Text="Initialize Keys" OnClick="btnInit_Click" /> <asp:Button ID="btnKey0" runat="server" Text="Change Key 0" OnClick="btnKey0_Click" />
</form>
</body> </html> File: Default.aspx.cs using System; using System.Data; using System.Configuration; 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; using System.Web.Caching; // necessary for CacheDependency using System.Xml; // necessary for Xml stuff public partial class Default_aspx : System.Web.UI.Page {
protected void Page_Load(object sender, EventArgs e) { CreateGridView(); } private void CreateGridView() { DataSet dsGrid; dsGrid = (DataSet)Cache["GridViewDataSet"]; if (dsGrid == null) { dsGrid = GetDataSet(); string[] fileDependsArray = {Server.MapPath("Data.xml")}; string[] cacheDependsArray = {"Depend0", "Depend1", "Depend2"}; CacheDependency cacheDepends = new CacheDependency (fileDependsArray, cacheDependsArray); Cache.Insert("GridViewDataSet", dsGrid, cacheDepends); lblMessage.Text = "Data from XML file."; } else { lblMessage.Text = "Data from cache."; } gv.DataSource = dsGrid.Tables[0]; gv.DataBind(); } private DataSet GetDataSet() { DataSet dsData = new DataSet(); XmlDataDocument doc = new XmlDataDocument(); doc.DataSet.ReadXml(Server.MapPath("Data.xml")); dsData = doc.DataSet; return dsData; } protected void btnClear_Click(object sender, EventArgs e) { Cache.Remove("GridViewDataSet"); CreateGridView(); } protected void btnInit_Click(object sender, EventArgs e) { Cache["Depend0"] = "This is the first dependency."; Cache["Depend1"] = "This is the 2nd dependency."; Cache["Depend2"] = "This is the 3rd dependency."; } protected void btnKey0_Click(object sender, EventArgs e) { Cache["Depend0"] = "This is a changed first dependency."; }
}
File: NorthWind.xml <?xml version="1.0" encoding="UTF-16" ?> <ROOT>
<Customers CustomerID="A" CompanyName="A" ContactName="Dan" ContactTitle="Sales" Address="Str. 57" City="Berlin" PostalCode="11111" Country="Germany" Phone="030-0074321" Fax="030-0076545" /> <Customers CustomerID="B" CompanyName="B" ContactName="Ana" ContactTitle="Owner" Address="Road 22" City="New York" PostalCode="00000" Country="Mexico" Phone="(555) 555-4729" Fax="(5) 555-3745" />
</ROOT></source>