Can we call interface method from razor view?

Question

I have to call a method which is implemented in a class. Is it possible from razor view?

Note: I dont want to expose the class directly to view

Answer 1

Yes, you can bind your Razor model to an interface (although you'll have to inject a concrete instance somewhere, typically your controller).

public ActionResult Index()
{
    IList<string> list = new List<string> {"one", "two"};
    return View(list);
}

Razor view:

@model IList<string>
@{ Model.RemoveAt(0); }

In this simple test case, RemoveAt() is guaranteed by the IList<T> interface, meaning that the underlying concrete implementation has not been exposed to the view.

An additional example would be a custom implementation where one public method of a concrete class is guaranteed by an interface and another is not:

public class Test : ITest
{
    public int Id { get; set; }
    public string Name { get; set; }

    public string GetName()
    {
        return Name;
    }

    public int GetId()
    {
        return Id;
    }
}

public interface ITest
{
    string GetName();
}

Controller:

public ActionResult Index()
{
    var test = new Test() {Id = 1, Name = "Test"};
    return View(test);
}

Razor View:

@model ITest
@(Model.GetId())

In this case GetId() would be highlighted red in the Razor view as invalid syntax and you would receive the following compilation error at runtime.

ITest' does not contain a definition for 'GetId'

On the flipside, Model.GetName() would correctly output "Test".