clear Element for configSections (General Settings Schema)

Articolo
04/30/2007

Removes all references to inherited sections and section groups, allowing only the sections and section groups that are added by the current section and sectionGroup elements.

<clear />

Attributes and Elements

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

Attributes

None.

Child Elements

None.

Parent Elements

Element	Description
configuration	Specifies the required root element in every configuration file that is used by the common language runtime and the .NET Framework applications.
configSections	Specifies configuration section and namespace declarations.
sectionGroup	Defines an association between a configuration section handler and a configuration section.

Remarks

The clear element removes all references to inherited sections and section groups, allowing only the sections and section groups that are added by the current section and sectionGroup elements.

If a configuration file tries to use a configuration section after the handler reference is removed, ASP.NET issues the server error, "Unrecognized configuration section element_name."

Example

The following code example shows how to use the clear element in an application configuration file to clear sections that were previously defined in the Machine.config file.

The following code from a Machine.config file declares two sections, sampleSection and anotherSampleSection, which are read before the application configuration file.

<configuration>
   <configSections>
      <section name="sampleSection"
               type="System.Configuration.SingleTagSectionHandler" />
      <section name="anotherSampleSection"
               type="System.Configuration.NameValueSectionHandler" />
   </configSections>
   <sampleSection setting1="Value1" setting2="value two" 
                  setting3="third value" />
</configuration>

The following code from an application configuration file clears all previously declared sections. The application cannot use or retrieve settings in either of the sections that were declared in the Machine.config file. However, the application can use settings from anotherSection because anotherSection is after the clear element.

<configuration>

<configSections>

<clear/>

<section name="anotherSection"

type="System.Configuration.NameValueSectionHandler" />

</configSections>

</configuration>

Element Information

Configuration section handler	Does not apply.
Configuration member	Clear Clear
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) version 5.0, 5.1, or 6.0 The .NET Framework version 1.0, 1.1, or 2.0 Microsoft Visual Studio 2003 or Visual Studio 2005

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clear Element for configSections (General Settings Schema)

Attributes and Elements

Attributes

Child Elements

Parent Elements

Remarks

Example

Element Information

See Also

Reference

Concepts

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