RouteValueExpressionBuilder Class

.NET Framework (current version)

Other Versions

Retrieves the value that corresponds to a specified URL parameter in a routed page.

Namespace: System.Web.Compilation
Assembly: System.Web (in System.Web.dll)

Inheritance Hierarchy

System.Object
System.Web.Compilation.ExpressionBuilder
System.Web.Compilation.RouteValueExpressionBuilder

Syntax

C++

public class RouteValueExpressionBuilder : ExpressionBuilder

Constructors

	Name	Description
	RouteValueExpressionBuilder()	Initializes a new instance of the RouteValueExpressionBuilder class.

Properties

	Name	Description
	SupportsEvaluate	Gets a value that indicates whether an expression can be evaluated in a page that is not compiled.(Overrides ExpressionBuilder.SupportsEvaluate.)

Methods

	Name	Description
	Equals(Object)	Determines whether the specified object is equal to the current object.(Inherited from Object.)
	EvaluateExpression(Object, BoundPropertyEntry, Object, ExpressionBuilderContext)	Retrieves the value that corresponds to a specified route key.(Overrides ExpressionBuilder.EvaluateExpression(Object, BoundPropertyEntry, Object, ExpressionBuilderContext).)
	Finalize()	Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.(Inherited from Object.)
	GetCodeExpression(BoundPropertyEntry, Object, ExpressionBuilderContext)	Returns a code expression that is used to perform the property assignment in the generated page class.(Overrides ExpressionBuilder.GetCodeExpression(BoundPropertyEntry, Object, ExpressionBuilderContext).)
	GetHashCode()	Serves as the default hash function. (Inherited from Object.)
	GetRouteValue(Page, String, Type, String)	Retrieves the value that corresponds to the specified URL parameter.
	GetType()	Gets the Type of the current instance.(Inherited from Object.)
	MemberwiseClone()	Creates a shallow copy of the current Object.(Inherited from Object.)
	ParseExpression(String, Type, ExpressionBuilderContext)	When overridden in a derived class, returns an object that represents the parsed expression.(Inherited from ExpressionBuilder.)
	ToString()	Returns a string that represents the current object.(Inherited from Object.)

Remarks

The RouteValueExpressionBuilder class makes it possible to use markup to set the property of a server control to the value of one of the URL parameters in a routed page.

Examples

The following example shows how to use markup to display the value of the URL parameter searchterm. The route is defined by using http://www.contoso.com/search/{searchterm} as the URL pattern.

<asp:Label ID="Label1" runat="server"
    text="<%$ RouteValue:searchterm %>">
</asp:Label>

If the page is requested with the URL http://www.contoso.com/search/Bicycles, the Label control displays "Bicycles".

Version Information

.NET Framework
Available since 4.0

Thread Safety

Any public static ( Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.