Get Value from generic interface

Question

if I have a class like this :

public class ApplicationDbContext : IdentityDbContext<ApplicationUser>, IDbContext

how can I get some properties of ApplicationUserinside ApplicationDbContext ?

`ApplicationUser` is a type parameter, not an instance. It has no properties, though you could get the property metadata through the type. What problem are you trying to solve? — Jeroen Mostert, Feb 21 '15 at 22:15
ok , could anyone explain me what is wrong with this question ? — kosnkov, Feb 21 '15 at 22:15
@Jeroen http://stackoverflow.com/questions/28649510/entity-framework-get-user-from-contex-in-savechanges — kosnkov, Feb 21 '15 at 22:16
@kosnkov: Is that your actual question? It looks like it, since it's a whole lot more detailed than this one. Please don't create duplicates of questions. — Jeroen Mostert, Feb 21 '15 at 22:18

score 0 · Answer 1 · answered Feb 21 '15 at 22:17

Think of the following program:

class Program
{
    static void Main(string[] args)
    {
        var calc = new Calculator<string>();
        Console.WriteLine(calc.Add(1,1));
    }
}

class Calculator<T>
{
    public int Add(int a, int b)
    {
        return a + b;
    }
}

There is no way to get any string-like properties from the calculator.

The reason is that string is a type parameter, not an object. Whether or not the class makes properties accessible depends on many other factors. A List<T> allows to get objects of type T back, but other classes needn't do that.

Get Value from generic interface

1 Answers1