problem in routing in asp.net mvc

i have

 routes.MapRoute("BuildingCompanyProject", "BuildingCompany/{projectId}/BuildingProject", new { controller = "BuildingProject", action = "Index", projectId = "" });

in Global.asax.cs

and is placed below the default route.

and the above route is called on clicking a link

<a title="Go toCompany" style="background: none!important" href='<%= Url.RouteUrl("BuildingCompanyProject",new {controller="BuildingProject" , action="Index" , projectId=item.Id})%>'>
               开发者_运维百科 beheer bedrijf</a>   

But on clicking the url is mapped to default route. How should i achieve this.

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You should put custom routes above the default route, when the default route could resolve your custom route (like it is in your case).

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In light of your comment, you say you have another URL "/BuildingProject" that should be resolved by the default route.

You should have then 3 routes: first the one to resolve "/BuildingProject", then your custom one that you talked about in the question, and only in the end the default route.

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Move your custom route above the default route. Remember that your url will match the default route first