Create custom route Handler

All routes we define is relied on default MvcRouteHandler. it connects routing system to MVC framework. Routing system also allow us to define our custom route handler by implementing IRouteHandler interface.

Public Class CustomRouteHandler
    Implements IRouteHandler


    Public Function GetHttpHandler(requestContext As System.Web.Routing.RequestContext) As System.Web.IHttpHandler Implements System.Web.Routing.IRouteHandler.GetHttpHandler

        Return New CustomHttpHandler

    End Function




End Class

Public Class CustomHttpHandler
    Implements IHttpHandler

    Public ReadOnly Property IsReusable As Boolean Implements System.Web.IHttpHandler.IsReusable
        Get
            Return False

        End Get
    End Property

    Public Sub ProcessRequest(context As System.Web.HttpContext) Implements System.Web.IHttpHandler.ProcessRequest

        Dim ua As String = context.Request.UserAgent


        context.Response.Write("This request is made From :-" & ua)



    End Sub

The purpose of the IRouteHandler is to generate implementation of IHttpHandler that is responsible for generate the response. In MVC implementation of these interfaces controllers are found, action are invoked and views are rendered and result is written to response.This is just simple example. we have just written User agent information in response object. create a custom route handle means to take a responsibility to handle all functionality that is automatically handle by MvcRouteHandler. but it give you a incredible freedom to define you route handling system.We can register our custom route handler when we define routes.

       routes.Add(New Route("{controller}/{action}", New CustomRouteHandler))