actionlink based on inheritance asp.net mvc 3

Let us say I have 3 classes A, B and C. B and C inherit from A which contains the string field Name.

I have implemented the controllers As, Bs and Cs for ea开发者_高级运维ch class. I can list all instances of B and C in a view called Index produced by controller As.

The controllers Bs and Cs also have a method Details which spews out a view given the id for an instance of B and C respectively.

I am wondering about the cleanest way to produce action links for the details pages for B and C objects? I could use GetType() and produce the controller name based on this but this seems a bit cumbersome.

Hope this makes sense. Looking forward to hearing from you. Thanks.

Christian

You could define an extension method on your A class that will return the name of the controller:

public static class AExtensions
{
    public static string GetControllerName(this A obj)
    {
       // put logic to determine type here
       if( obj is B ) return "BController";
       else if( obj is C ) return "CController";
       else return "AController";

    }
}

Then in your view you could have your link:

@Html.ActionLink("Details", "Details", obj.GetControllerName(), new { id= obj.Id })

This method sort of makes me feel dirty but it works I guess.

Somebody needs to make the decision about object type. All that remains is where you do it. If you only have a single list with all of the types in it you can split the list in the controller. Then recombine the types in the view.

foreach (var obj in AllObjs)
{
   if (obj.GetType().Equals(typeof(B))
     Model.AllBType.Add(obj);
   else
     Model.AllCType.Add(obj);
}

@foreach (var obj in Model.AllBType)
   Html.ActionLink("Details", "Details", "BController", new { id = obj.Id });

@foreach (var obj in Model.AllCType)
   Html.ActionLink("Details", "Details", "CController", new { id = obj.Id });

If you create the B and C objects or query for them individually by type why not just keep those results as independent lists in your model.