如何在routeconfig.cs中创建条件

您可以为此使用自定义约束:

public class MyCons : IRouteConstraint
{
    public bool Match(HttpContextBase httpContext, Route route, string parameterName, RouteValueDictionary values, RouteDirection routeDirection)
    {
        ClassA classA = new Class();
        return classA.IsThisTrue();
    }
}

然后在您的路线中使用它:

routes.MapRoute(
    name: "myRoute",
    // your own route 
    url: "myUrl/{myParam}",
    defaults: new { controller = "Some", action = "Index" }
    constraints: new { myParam= new MyCons() }
);
// other route
routes.MapRoute(
    name: "myOtherRoute",
    // your own route 
    url: "myOtherUrl/{myParam}",
    defaults: new { controller = "Foo", action = "Index" }
    constraints: new { myParam= new MyCons() }
);