pages Element (ASP.NET Settings Schema)

Article
04/30/2007

Globally defines page-specific configuration settings, such as ASP.NET directives for pages and controls that are within the scope of the configuration file.

<pages     
   buffer="[True|False]"
   enableEventValidation="[True|False]"
   enableSessionState="[True|False|ReadOnly]"
   enableViewState="[True|False]"
   enableViewStateMac="[True|False]"
   smartNavigation="[True|False]"
   autoEventWireup="[True|False]"
   pageBaseType="typename, assembly"
   userControlBaseType="typename"
   validateRequest="[True|False]"
   masterPageFile="file path" 
   theme="string"
   styleSheetTheme="string"
   maxPageStateFieldLength="number" 
   compilationMode="[Always|Auto|Never]" 
   pageParserFilterType="string" 
   viewStateEncryptionMode="[Always|Auto|Never]" 
   maintainScrollPositionOnPostBack="[True|False]" 
   asyncTimeout="number"
>
   <controls>...</controls>
   <namespaces>...</namespaces>
   <tagMapping>...</tagMapping>
</pages>

Attributes and Elements

The following sections describe attributes, child elements, and parent elements.

Attributes

asyncTimeout

Optional TimeSpan attribute.

Specifies the number of seconds to wait for an asynchronous handler to complete during asynchronous processing.

This attribute is new in the .NET Framework version 2.0.

The default is "0:00:45" (45 seconds).

autoEventWireup

Optional Boolean attribute.

Specifies whether page events are automatically enabled. This is if the autoevent wireup occurs, which means that the system will automatically attach the methods of a particular signature (page_Load for example). For more information, see ASP.NET Web Server Control Event Model.

The default is True.

buffer

Optional Boolean attribute.

Specifies whether the URL resource uses response buffering.

The default is True.

compilationMode

Optional CompilationMode attribute.

Specifies whether an ASP.NET page or control should be compiled at run time.

The compilationMode attribute is new in the .NET Framework 2.0. This attribute can be one of the following possible values. The default is Always.

Always

The page should always be compiled.

Auto

ASP.NET will not compile the page, if possible.

Never

The page or control should never be dynamically compiled.

If a page contains a script block or code construct that requires compilation, ASP.NET will return with an error and the page will not run.

enableEventValidation

Specifies whether pages and controls validate postback and callback events. The default is True.

enableSessionState

Optional String attribute.

Specifies session state requirements for the resources that are within the scope of the configuration file.

The enableSessionState attribute can be one of the following possible values. The default is True.

Value	Description
False	Indicates that session state is disabled.
ReadOnly	Indicates that session state is not writable.
True	Indicates that session state is enabled.

enableViewState

Optional Boolean attribute.

Specifies whether view state is enabled and maintained across page requests.

The default is True.

enableViewStateMac

Optional Boolean attribute.

Specifies whether ASP.NET should run a message authentication code (MAC) on the view state for the page when the page is posted back from the client. If True, the encrypted view state is checked to verify that it has not been tampered with on the client.

The default is True.

maintainScrollPositionOnPostBack

Optional Boolean attribute.

Specifies whether to return the user to the same position in the client browser when pages are posted back to the server. If False, the user is returned to the top of the page on a postback.

This attribute is new in the .NET Framework 2.0.

The default is False.

masterPageFile

Optional String attribute.

Specifies the master page path relative to the local configuration file. Pages that have the masterPageFile attribute set to True must contain a Content control as the top-level control

This attribute is new in the .NET Framework 2.0.

The default is an empty string ("").

maxPageStateFieldLength

Optional Int32 attribute.

Specifies the maximum length in characters for the state field for the page. If set to a positive number, the view-state field that is sent to the client browser is separated into chunks, and each chunk is less than the size that is specified in the maxPageStateFieldLength attribute. If set to a negative number, the view-state field should not be separated into chunks.

This attribute is new in the .NET Framework 2.0.

The default is "-1".

pageBaseType

Optional String attribute.

Specifies the base to use when the pages are stand-alone only. This is overridden by the inherits attribute in a stand-alone file.

The default is "System.Web.UI.Page".

pageParserFilterType

Optional String attribute.

Specifies the type name of a filter that is used by the ASP.NET parser to determine whether an item is allowed in the page at parse time. The filter must derive from the PageParserFilter class.

This attribute is new in the .NET Framework 2.0.

The default is an empty string ("").

smartNavigation

Optional Boolean attribute.

Specifies whether smart navigation is enabled. Smart navigation requires Microsoft Internet Explorer version 5.5 or later. When smart navigation is enabled, the user experiences the following benefits:

Navigational flashing is eliminated.
Scroll position is persisted between pages.
Element focus is persisted between pages.
The last state for the page is the only state retained by the history on the browser.

This attribute is new in the .NET Framework 2.0, but has been deprecated in favor of the maintainScrollPositionOnPostBack attribute.

The default is False.

styleSheetTheme

Optional String attribute.

Specifies the name of the "named theme" folder to be used to apply the theme before control declarations, in contrast with the theme attribute that defines the theme to apply after the control declaration.

This attribute is new in the .NET Framework 2.0.

The default is an empty string ("").

theme

Optional String attribute.

Specifies the name of the theme that is used for the pages that are within the scope of the configuration file. The specified theme must exist as either an application or a global theme. If the theme does not exist, an HttpException exception is thrown.

This attribute is new in the .NET Framework 2.0.

The default is an empty string ("").

userControlBaseType

Optional String attribute.

Specifies the base to use when the pages are stand-alone only.

The default is "System.Web.UI.UserControl".

validateRequest

Optional Boolean attribute.

Indicates that ASP.NET examines all input from the browser for potentially dangerous data. If True, request validation is performed by comparing all input data to a list of potentially dangerous values. If a match occurs, ASP.NET raises an HttpRequestValidationException exception.

The default is True.

viewStateEncryptionMode

Optional ViewStateEncryptionMode attribute.

Specifies the encryption mode of the view state. The ViewStateEncryptionMode property overrides this attribute, which is set in the configuration file.

This attribute can be one of the following possible values.

Value	Description
Always	View state is always encrypted.
Auto	View state is encrypted, if a control requests it.
Never	View state is never encrypted, even if a control requests it.

This attribute is new in the .NET Framework 2.0.

The default is Auto.

Child Elements

Element	Description
controls	Defines a collection of register directives and the namespaces where the tag prefixes reside.
namespaces	Defines a collection of import directives to use during assembly precompilation.
tagMapping	Defines a collection of tag types that are remapped to other tag types at compile time.

Parent Elements

Element	Description
configuration	The required root element in every configuration file that is used by the common language runtime and the .NET Framework–based applications.
system.web	Specifies the root element for the ASP.NET configuration settings in a configuration file and contains configuration elements that configure ASP.NET Web applications and control how the applications behave.

Remarks

The pages element defines page-specific configuration settings. This configuration section supports setting certain ASP.NET page and control directives globally for all pages and controls in the scope of the configuration file. This includes the following page-level directives, which specify settings that are used by the page and user-control compilers when the compilers process ASP.NET Web Forms page (.aspx) and user control (.ascx) files:

The @ Page directive (@ Page).
The @ Import directive (@ Import) through the namespaces child element.
The @ Register directive (@ Register) through the controls child element.

The pages element also provides support for mapping tag types to other tag types at run time through the tagMapping element.

Note

Adding an @ Page directive to a master page does not allow you use the same directive declaration in pages that depend on the master. Instead, use the pages configuration element to globally define page directives.

Default Configuration

The following default pages element is not explicitly configured in the Machine.config file or in the root Web.config file. However, it is the default configuration that is returned by an application. Namespaces and controls are added in the root Web.config file.

<pages 
   buffer="true" 
   enableSessionState="true" 
   enableViewState="true" 
   enableViewStateMac="true" 
   smartNavigation="false" 
   autoEventWireup="true" 
   pageBaseType="System.Web.UI.Page" 
   userControlBaseType="System.Web.UI.UserControl" 
   validateRequest="true" 
   masterPageFile="" 
   theme="" 
   styleSheetTheme="" 
   maxPageStateFieldLength="-1" 
   compilationMode="Always" 
   pageParserFilterType="" 
   viewStateEncryptionMode="Auto" 
   maintainScrollPositionOnPostBack="false" 
   asyncTimeout="45"
>
   <namespaces>
      <clear />
   </namespaces>
   <tagMapping>
      <clear />
   </tagMapping>
</pages>

Example

The following code example demonstrates how to specify several page configuration settings.

<configuration>
   <system.web>
      <pages buffer="true"
         enableSessionState="true"
         autoEventWireup="true"
         maintainScrollPositionOnPostBack="true"
         masterPageFile = "~/Masters/Page1.master" />
  </system.web>
</configuration>

Element Information

Configuration section handler	PagesSection
Configuration member	Pages Page
Configurable locations	Machine.config Root-level Web.config Application-level Web.config Virtual- or physical directory–level Web.config
Requirements	Microsoft Internet Information Services (IIS) versions 5.0, 5.1, or 6.0 The .NET Framework versions 1.0, 1.1, or 2.0 Microsoft Visual Studio 2003 or Visual Studio 2005

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pages Element (ASP.NET Settings Schema)

Attributes and Elements

Attributes

Child Elements

Parent Elements

Remarks

Default Configuration

Example

Element Information

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Reference

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