Overload action with different parameters

Question

I have several model classes inherited from common base (e.g. Class1, Class2 inherits from CommonClass). I would like to write separate overloaded controller action which would have each of these model classes as parameter. For example:

    [HttpPost]
    public JsonResult MyAction(Class1 data)
    {
       // handle data here
    }

    [HttpPost]
    public JsonResult MyAction(Class2 data)
    {
       // handle data here
    }

Is it somehow possible to achieve that? When I try to simply write those action methods, MVC throws System.Reflection.AmbiguousMatchException.

I have also tried to write single action with base class as parameter and then cast data to specific class, but this gives me null.

    [HttpPost]
    public JsonResult MyAction(CommonClass data)
    {
        if(data.IsSomething)
        {
            var castedData = data as Class1;
            // process casted data
        }
        else
        {
            var castedData = data as Class2;
            // process casted data
        }
    }

score 4 · Accepted Answer · edited May 23 '17 at 12:15

4

You cannot have multiple actions with the same name and HTTP verb on the same controller. You will need to have different action names and routes.

Alternatively you may checkout this answer in which I illustrate how you could write a custom model binder and achieve polymorphic binding (your second attempt with the base class).

edited May 23 '17 at 12:15

Community

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answered Jan 05 '16 at 10:56

Darin Dimitrov

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score 1 · Answer 2 · answered Jan 05 '16 at 11:36

You could decorate your action with the [ActionName] annotation. Like this:

[HttpPost, ActionName("OtherName")]
public JsonResult MyAction(Class1 data)
{
   // handle data here
}

[HttpPost]
public JsonResult MyAction(Class2 data)
{
   // handle data here
}

And with that you can use to put names with characters that .NET do not allow, like [ActionName("This-Example")]

Overload action with different parameters

2 Answers2