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CacheSection Class

.NET Framework 4

Configures the global cache settings for an ASP.NET application. This class cannot be inherited.

System.Object
  System.Configuration.ConfigurationElement
    System.Configuration.ConfigurationSection
      System.Web.Configuration.CacheSection

Namespace:  System.Web.Configuration
Assembly:  System.Web (in System.Web.dll)
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public sealed class CacheSection : ConfigurationSection

The CacheSection type exposes the following members.

  Name Description
Public method CacheSection Infrastructure. Initializes a new instance of the CacheSection class.
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  Name Description
Public property CurrentConfiguration Gets a reference to the top-level Configuration instance that represents the configuration hierarchy that the current ConfigurationElement instance belongs to. (Inherited from ConfigurationElement.)
Public property DisableExpiration Gets or sets a value indicating whether the cache expiration is disabled.
Public property DisableMemoryCollection Gets or sets a value indicating whether the cache memory collection is disabled.
Public property ElementInformation Gets an ElementInformation object that contains the non-customizable information and functionality of the ConfigurationElement object. (Inherited from ConfigurationElement.)
Protected property ElementProperty Gets the ConfigurationElementProperty object that represents the ConfigurationElement object itself. (Inherited from ConfigurationElement.)
Protected property EvaluationContext Gets the ContextInformation object for the ConfigurationElement object. (Inherited from ConfigurationElement.)
Protected property Item[ConfigurationProperty] Gets or sets a property or attribute of this configuration element. (Inherited from ConfigurationElement.)
Protected property Item[String] Gets or sets a property, attribute, or child element of this configuration element. (Inherited from ConfigurationElement.)
Public property LockAllAttributesExcept Gets the collection of locked attributes. (Inherited from ConfigurationElement.)
Public property LockAllElementsExcept Gets the collection of locked elements. (Inherited from ConfigurationElement.)
Public property LockAttributes Gets the collection of locked attributes (Inherited from ConfigurationElement.)
Public property LockElements Gets the collection of locked elements. (Inherited from ConfigurationElement.)
Public property LockItem Gets or sets a value indicating whether the element is locked. (Inherited from ConfigurationElement.)
Public property PercentagePhysicalMemoryUsedLimit Gets or sets a value indicating the maximum percentage of virtual memory usage.
Public property PrivateBytesLimit Gets or sets a value indicating the maximum size of the working-process private space.
Public property PrivateBytesPollTime Gets or sets a value indicating the time interval between polling for the worker-process memory usage.
Protected property Properties Gets the collection of properties. (Inherited from ConfigurationElement.)
Public property SectionInformation Gets a SectionInformation object that contains the non-customizable information and functionality of the ConfigurationSection object. (Inherited from ConfigurationSection.)
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  Name Description
Protected method DeserializeElement Reads XML from the configuration file. (Inherited from ConfigurationElement.)
Protected method DeserializeSection Infrastructure. Reads XML from the configuration file. (Inherited from ConfigurationSection.)
Public method Equals Compares the current ConfigurationElement instance to the specified object. (Inherited from ConfigurationElement.)
Protected method Finalize Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
Public method GetHashCode Gets a unique value representing the current ConfigurationElement instance. (Inherited from ConfigurationElement.)
Protected method GetRuntimeObject Returns a custom object when overridden in a derived class. (Inherited from ConfigurationSection.)
Protected method GetTransformedAssemblyString Returns the transformed version of the specified assembly name. (Inherited from ConfigurationElement.)
Protected method GetTransformedTypeString Returns the transformed version of the specified type name. (Inherited from ConfigurationElement.)
Public method GetType Gets the Type of the current instance. (Inherited from Object.)
Protected method Init Sets the ConfigurationElement object to its initial state. (Inherited from ConfigurationElement.)
Protected method InitializeDefault Used to initialize a default set of values for the ConfigurationElement object. (Inherited from ConfigurationElement.)
Protected method IsModified Indicates whether this configuration element has been modified since it was last saved or loaded when implemented in a derived class. (Inherited from ConfigurationSection.)
Public method IsReadOnly Gets a value indicating whether the ConfigurationElement object is read-only. (Inherited from ConfigurationElement.)
Protected method ListErrors Adds the invalid-property errors in this ConfigurationElement object, and in all subelements, to the passed list. (Inherited from ConfigurationElement.)
Protected method MemberwiseClone Creates a shallow copy of the current Object. (Inherited from Object.)
Protected method OnDeserializeUnrecognizedAttribute Gets a value indicating whether an unknown attribute is encountered during deserialization. (Inherited from ConfigurationElement.)
Protected method OnDeserializeUnrecognizedElement Gets a value indicating whether an unknown element is encountered during deserialization. (Inherited from ConfigurationElement.)
Protected method OnRequiredPropertyNotFound Throws an exception when a required property is not found. (Inherited from ConfigurationElement.)
Protected method PostDeserialize Called after deserialization. (Inherited from ConfigurationElement.)
Protected method PreSerialize Called before serialization. (Inherited from ConfigurationElement.)
Protected method Reset Resets the internal state of the ConfigurationElement object, including the locks and the properties collections. (Inherited from ConfigurationElement.)
Protected method ResetModified Resets the value of the IsModified method to false when implemented in a derived class. (Inherited from ConfigurationSection.)
Protected method SerializeElement Writes the contents of this configuration element to the configuration file when implemented in a derived class. (Inherited from ConfigurationElement.)
Protected method SerializeSection Infrastructure. Creates an XML string containing an unmerged view of the ConfigurationSection object as a single section to write to a file. (Inherited from ConfigurationSection.)
Protected method SerializeToXmlElement Writes the outer tags of this configuration element to the configuration file when implemented in a derived class. (Inherited from ConfigurationElement.)
Protected method SetPropertyValue Sets a property to the specified value. (Inherited from ConfigurationElement.)
Protected method SetReadOnly Sets the IsReadOnly property for the ConfigurationElement object and all subelements. (Inherited from ConfigurationElement.)
Protected method ShouldSerializeElementInTargetVersion Indicates whether the specified element should be serialized when the configuration object hierarchy is serialized for the specified target version of the .NET Framework. (Inherited from ConfigurationSection.)
Protected method ShouldSerializePropertyInTargetVersion Indicates whether the specified property should be serialized when the configuration object hierarchy is serialized for the specified target version of the .NET Framework. (Inherited from ConfigurationSection.)
Protected method ShouldSerializeSectionInTargetVersion Indicates whether the current ConfigurationSection instance should be serialized when the configuration object hierarchy is serialized for the specified target version of the .NET Framework. (Inherited from ConfigurationSection.)
Public method ToString Returns a string that represents the current object. (Inherited from Object.)
Protected method Unmerge Modifies the ConfigurationElement object to remove all values that should not be saved. (Inherited from ConfigurationElement.)
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The CacheSection class provides a way to programmatically access and modify the <cache> section of a configuration file.

The ASP.NET caching feature is implemented by the Cache class. For more information, see ASP.NET Caching.

Note Note

The CacheSection can write information into the related section of the configuration file according to the restrictions defined by the section property AllowDefinition whose value is MachineToApplication. Any attempt to write in a configuration file at a level not allowed in the hierarchy will result in an error message generated by the parser. However, you can use this class to read configuration information at any level in the hierarchy.

A cache is an application-specific hash table used to store frequently accessed data. Application and session state are similar to the cache, the application state being the most similar, due to its application-wide scope. One of the biggest differences between the cache and the application-state mechanism is that the cache supports dependencies These dependencies make it possible to build applications that automatically remove cached items when certain events occur.

The following code example shows a page and the related code file used to access the CacheSection section attributes.

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<%@ Page Language="VB" AutoEventWireup="false" CodeFile="ReadWriteCache.aspx.vb" Inherits="ReadWriteCache" %>

<!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 id="Head1" runat="server">
    <title>Read Write Application Cache</title>
</head>
<body>
    <form id="form1" runat="server">
        <h2>Read Write Application Cache</h2>

        <asp:Label ID="Label1" Text="[Application Cache goes here.]" runat="server"></asp:Label>

        <hr />

        <asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Write Cache" /> &nbsp; &nbsp;
        <asp:Button ID="Button2" runat="server" onclick="Button2_Click" Text="Read Cache" />
    </form>
</body>
</html>

C#
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class ReadWriteCache : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
            Label1.Text = "Application Cache goes here.";

    }

    protected void Button1_Click(object sender, EventArgs e)
    {
        // Get the application configuration file.
        System.Configuration.Configuration config =
          System.Web.Configuration.WebConfigurationManager.OpenWebConfiguration("~/");


        System.Web.Configuration.CacheSection cacheSection =
            (System.Web.Configuration.CacheSection)config.GetSection(
                "system.web/caching/cache");

        // Increase the PrivateBytesLimit property to 0.
        cacheSection.PrivateBytesLimit = 
            cacheSection.PrivateBytesLimit + 10;


        // Increase memory limit.
        cacheSection.PercentagePhysicalMemoryUsedLimit = 
            cacheSection.PercentagePhysicalMemoryUsedLimit + 1;

        // Increase poll time.
        cacheSection.PrivateBytesPollTime =
            cacheSection.PrivateBytesPollTime + TimeSpan.FromMinutes(1);


        // Enable or disable memory collection.
        cacheSection.DisableMemoryCollection = 
                !cacheSection.DisableMemoryCollection;

        // Enable or disable cache expiration.
        cacheSection.DisableExpiration =
            !cacheSection.DisableExpiration;

        // Save the configuration file.
        config.Save(System.Configuration.ConfigurationSaveMode.Modified);      

    }

    protected void Button2_Click(object sender, EventArgs e)
    {

        // Get the application configuration file.
        System.Configuration.Configuration config =
          System.Web.Configuration.WebConfigurationManager.OpenWebConfiguration("~/");


        System.Web.Configuration.CacheSection cacheSection =
            (System.Web.Configuration.CacheSection)config.GetSection(
                "system.web/caching/cache");

        // Read the cache section.
        System.Text.StringBuilder buffer = new System.Text.StringBuilder();

        string currentFile = cacheSection.CurrentConfiguration.FilePath;
        bool dExpiration = cacheSection.DisableExpiration;
        bool dMemCollection = cacheSection.DisableMemoryCollection;
        TimeSpan pollTime = cacheSection.PrivateBytesPollTime;
        int phMemUse = cacheSection.PercentagePhysicalMemoryUsedLimit;
        long pvBytesLimit = cacheSection.PrivateBytesLimit;

        string cacheEntry = String.Format("File: {0} <br/>", currentFile);
        buffer.Append(cacheEntry);
        cacheEntry = String.Format("Expiration Disabled: {0} <br/>", dExpiration);
        buffer.Append(cacheEntry);
        cacheEntry = String.Format("Memory Collection Disabled: {0} <br/>", dMemCollection);
        buffer.Append(cacheEntry);
        cacheEntry = String.Format("Poll Time: {0} <br/>", pollTime.ToString());
        buffer.Append(cacheEntry);
        cacheEntry = String.Format("Memory Limit: {0} <br/>", phMemUse.ToString());
        buffer.Append(cacheEntry);
        cacheEntry = String.Format("Bytes Limit: {0} <br/>", pvBytesLimit.ToString());
        buffer.Append(cacheEntry);

        Label1.Text = buffer.ToString();
    }
}

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
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