ASP.NET MVC4 List of all areas

Question

我有一个ASP.NET MVC4应用程序，我在其中创建多个区域，有没有一种方法可以通过编程方式找出存在的区域数量及其名称。

Answer 1

The AreaRegistration.RegisterAllAreas(); registers each area route with the DataTokens["area"] where the value is the name of the area.

So you can get the registered area names from the RouteTable

var areaNames = RouteTable.Routes.OfType<Route>()
    .Where(d => d.DataTokens != null && d.DataTokens.ContainsKey("area"))
    .Select(r => r.DataTokens["area"]).ToArray();

If you are looking for the AreaRegistration themselves you can use reflection to get types which derives from AreaRegistration in your assambly.

Answer 2

AreaRegistration.RegisterAllAreas() cannot be used pre-initialization of the web application. However, if you want to get the areas without calling RegisterAllAreas() , eg in an automated test, then the following code may be helpful:

     var areaNames = new List<string>();
     foreach (var type in typeof(MvcApplication).Assembly.GetTypes().Where(t => t.IsSubclassOf(typeof(AreaRegistration)))) {
        var areaRegistration = Activator.CreateInstance(type) as AreaRegistration;
        areaNames.Add(areaRegistration.AreaName);
     }

Note that MvcApplication is the class derived from HttpApplication . You can use any class name as long as that class is in the same assembly as the assembly registrations, ie the classes derived from AreaRegistration . If you have split up your application with areas in more than one assembly, then you'd need to adapt this code accordingly so it searches all those assemblies.