ASP.NET Tutorial/Cache/Introduction

Материал из .Net Framework эксперт
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Basic operations executed on the ASP.NET Cache object

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" 
    Inherits="Default" %>
<!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>Testing the Cache</title>
</head>
<body>
    <div id="pageContent">
        <form id="form1" runat="server">
            <asp:Button ID="Button1" runat="server" Text="Add a new item..." OnClick="Add_Click" />
            <asp:Button ID="Button2" runat="server" Text="Read the item..." OnClick="Read_Click" />
            <asp:Button ID="Button3" runat="server" Text="Remove the item..." OnClick="Remove_Click" />
            <hr />
            <asp:Label runat="server" ID="Label1" />
        </form>
    </div>
</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;

public partial class Default : System.Web.UI.Page
{
    protected void Read_Click(object sender, EventArgs e)
    {
        string msg = String.Format("{0} ({1})", 
            Cache.Get("MyData"), 
            Cache.Get("MyData").GetType().ToString());
        Label1.Text = msg;
    }
    protected void Add_Click(object sender, EventArgs e)
    {
        Cache["MyData"] = DateTime.Now;
    }
    protected void Remove_Click(object sender, EventArgs e)
    {
        object obj = Cache.Remove("MyData");
        Label1.Text = obj.GetType().ToString();
    }
}


Cache Object DataSource

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="CacheObjectDataSource" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Cached object data source</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:GridView ID="_peopleGridView" runat="server" 
            DataSourceID="_personObjectDataSource"
            EnableViewState="False" />
        <asp:ObjectDataSource ID="_personObjectDataSource" runat="server" 
            CacheDuration="120"
            EnableCaching="True" SelectMethod="GetPeople" DataObjectTypeName="Person"
            TypeName="SampleData" />    
    </div>
    </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 CacheObjectDataSource : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        Response.Output.Write("objds.GetHashCode() = {0}<br />", _personObjectDataSource.GetType().GetHashCode());
        Response.Output.Write("objds.CacheDuration = {0}<br />", _personObjectDataSource.CacheDuration);
        Response.Output.Write("objds.CacheExpirationPolicy = {0}<br />", _personObjectDataSource.CacheExpirationPolicy);
        Response.Output.Write("objds.SqlCacheDependency = {0}<br />", _personObjectDataSource.SqlCacheDependency);
        Response.Output.Write("objds.Typename = {0}<br />", _personObjectDataSource.TypeName);
        Response.Output.Write("objds.SelctMethod = {0}<br />", _personObjectDataSource.SelectMethod);
    }
}
File: Person.cs
using System;
using System.Data;
using System.Collections.Generic;
using System.Collections;
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;
public class Person
{
    private int _age;
    private string _name;
    private bool _isMarried;
    private DateTime _birthDay;
    public int Age
    {
        get { return _age; }
        set { _age = value; }
    }
    public string Name
    {
        get { return _name; }
        set { _name = value; }
    }
    public bool IsMarried
    {
        get { return _isMarried; }
        set { _isMarried = value; }
    }
    public DateTime BirthDay
    {
        get { return _birthDay; }
        set { _birthDay = value; }
    }
    public Person() { }
    public Person(int age, string name, bool isMarried, DateTime birthDay)
    {
        _age = age;
        _name = name;
        _isMarried = isMarried;
        _birthDay = birthDay;
    }
}
public static class SampleData
{
    public static ICollection<Person> GetPeople()
    {
        List<Person> ret = new List<Person>();
        for (int i = 0; i < 10; i++)
            ret.Add(new Person(i + 20, "Person " + i.ToString(), (i % 2) == 0, 
                               DateTime.Now.AddYears(i-40)));
        
        return ret;
    }
}


Convert data in Cache to integer

<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <br />
        <asp:Label ID="Label1" runat="server" Width="147px"></asp:Label>
        <br />
        <br />
        <asp:Button ID="Button1" runat="server" Text="Button" Width="98px" />
        <br />
        <br />
        <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox><br />
        <br />
        <asp:Table ID="Table1" runat="server" Height="88px" Width="166px">
        </asp:Table>
        <br />
        <asp:Button ID="Button2" runat="server" Text="Button" Width="93px" /><br />
    </div>
    </form>
</body>
</html>
File: Default.aspx.vb

Partial Class _Default
    Inherits System.Web.UI.Page
    
    Private Property myCounter() As Integer
        Get
            Return CInt(Cache("myCounter"))
        End Get
        Set(ByVal Value As Integer)
            Cache("myCounter") = Value
        End Set
    End Property
    Private ReadOnly Property RowTexts() As ArrayList
        Get
            Dim al As ArrayList
            al = CType(Cache("rowTexts"), ArrayList)
            If IsNothing(al) Then
                al = New ArrayList()
                Cache("rowTexts") = al
            End If
            Return al
        End Get
    End Property
    Private Sub AddARow(ByVal s As String)
        Dim cell As New TableCell()
        Dim row As New TableRow()
        cell.Text = s
        row.Cells.Add(cell)
        Table1.Rows.Add(row)
    End Sub

    Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
        myCounter += 1
        Label1.Text = myCounter.ToString()

    End Sub
    Protected Sub Button2_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button2.Click
        RowTexts.Add(TextBox1.Text)
        AddARow(TextBox1.Text)
    End Sub
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        Dim s As String
        For Each s In RowTexts
            AddARow(s)
        Next
    End Sub
End Class


Overview of Caching

The ASP.NET 3.5 Framework supports the following types of caching:
Page Output Caching caches an entire page. 
Partial Page Caching caches only particular regions of a page. 
DataSource Caching caches different ASP.NET DataSource controls such as the SqlDataSource and ObjectDataSource controls. 
Data Caching caches arbitrary objects in memory.


Programmatic Fragment Caching

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="ProgrammaticFragmentCaching" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <asp:Label runat="server" ID="_timestampLabel" EnableViewState="false" />
    <hr />
    </div>
    </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 ProgrammaticFragmentCaching : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        _timestampLabel.Text = "This page generated at " + DateTime.Now.ToLongTimeString();
        Response.Cache.SetExpires(DateTime.Now + new TimeSpan(0, 1, 0));
    }
}
Источник — «http://nfex.ru/index.php?title=ASP.NET_Tutorial/Cache/Introduction&oldid=2898»