The RouteValueDictionary class enables you to work with collections of key/value pairs that are required in order to use ASP.NET routing. You use the RouteValueDictionary object to define values for the Constraints, DataTokens, and Defaults properties. You also use a RouteValueDictionary object when you generate a URL by calling the GetVirtualPath method and passing a RouteValueDictionary object as a parameter.

Every key in a RouteValueDictionary object must be unique. The RouteValueDictionary class uses case-insensitive ordinal comparison. For more information, see OrdinalIgnoreCase. A key cannot be nullNothingnullptra null reference (Nothing in Visual Basic).

The following example shows how to create a Route object and how to set the Constraints, DataTokens, and Defaults properties.

Sub Application_Start(ByVal sender As Object, ByVal e As EventArgs)
    RegisterRoutes(RouteTable.Routes)
End Sub

Shared Sub RegisterRoutes(ByVal routes As RouteCollection)
    Dim urlPattern As String
    Dim reportRoute As Route

    urlPattern = "{locale}/{year}"

    reportRoute = New Route(urlPattern, New ReportRouteHandler)
    reportRoute.Defaults = New RouteValueDictionary(New With {.locale = "en-US", .year = DateTime.Now.Year.ToString()})
    reportRoute.Constraints = New RouteValueDictionary(New With {.locale = "[a-z]{2}-[a-z]{2}", .year = "\d{4}"})
    reportRoute.DataTokens = New RouteValueDictionary(New With {.format = "short"})

    routes.Add(reportRoute)
End Sub

• AspNetHostingPermission 

  for operating in a hosted environment. Demand value: LinkDemand; Permission value: Minimal.

• AspNetHostingPermission 

  for operating in a hosted environment. Demand value: InheritanceDemand; Permission value: Minimal.

Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003

.NET Framework

Reference