ExpressionBuilder Class

Article
05/24/2022

Maps an expression prefix to an expression builder type.

Syntax

class ExpressionBuilder : CollectionElement

Methods

This class contains no methods.

Properties

The following table lists the properties exposed by the ExpressionBuilder class.

Name	Description
`ExpressionPrefix`	A read-only `string` value that contains the prefix for the current expression builder object. The key property.
`Type`	A read/write `string` value that contains a type associated with the prefix specified in the `ExpressionPrefix` property.

Subclasses

This class contains no subclasses.

Remarks

Instances of this class are contained in the ExpressionBuilders array property of the ExpressionBuilderSettings class.

Expression builders allow property values to be set and retrieved in a control during page parsing. When the page parser encounters an expression in the format <%$ prefix:value %>, it creates an expression builder based on prefix and passes the value to the expression builder for evaluation. The expression builder then returns the requested value to the page.

ExpressionPrefix values are associated with expression builders in the <``expressionBuilders``> section of a Web.config file, as the following example shows:

<configuration>

<system.web>

<compilation>

<expressionBuilders>

<add expressionPrefix="TCO"

type="Contoso.Finance.TCOExpressionBuilder"/>

</expressionBuilders>

</compilation>

</system.web>

</configuration>

Inheritance Hierarchy

CollectionElement

ExpressionBuilder

Requirements

Type	Description
Client	- IIS 7.0 on Windows Vista - IIS 7.5 on Windows 7 - IIS 8.0 on Windows 8 - IIS 10.0 on Windows 10
Server	- IIS 7.0 on Windows Server 2008 - IIS 7.5 on Windows Server 2008 R2 - IIS 8.0 on Windows Server 2012 - IIS 8.5 on Windows Server 2012 R2 - IIS 10.0 on Windows Server 2016
Product	- IIS 7.0, IIS 7.5, IIS 8.0, IIS 8.5, IIS 10.0
MOF file	WebAdministration.mof

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