RouteValueExpressionBuilder Class

.NET Framework (current version)

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)


public class RouteValueExpressionBuilder : ExpressionBuilder


Initializes a new instance of the RouteValueExpressionBuilder class.


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


Determines whether the specified object is equal to the current object.(Inherited from Object.)

System_CAPS_pubmethodEvaluateExpression(Object, BoundPropertyEntry, Object, ExpressionBuilderContext)

Retrieves the value that corresponds to a specified route key.(Overrides ExpressionBuilder.EvaluateExpression(Object, BoundPropertyEntry, Object, ExpressionBuilderContext).)


Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.(Inherited from Object.)

System_CAPS_pubmethodGetCodeExpression(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).)


Serves as the default hash function. (Inherited from Object.)

System_CAPS_pubmethodSystem_CAPS_staticGetRouteValue(Page, String, Type, String)

Retrieves the value that corresponds to the specified URL parameter.


Gets the Type of the current instance.(Inherited from Object.)


Creates a shallow copy of the current Object.(Inherited from Object.)

System_CAPS_pubmethodParseExpression(String, Type, ExpressionBuilderContext)

When overridden in a derived class, returns an object that represents the parsed expression.(Inherited from ExpressionBuilder.)


Returns a string that represents the current object.(Inherited from Object.)

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.

The following example shows how to use markup to display the value of the URL parameter searchterm. The route is defined by using{searchterm} as the URL pattern.

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

If the page is requested with the URL, the Label control displays "Bicycles".

.NET Framework
Available since 4.0

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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