CODEWITHSUNDEEP
c#generics
Masoud
Masoud

Reputation: 8171

Get an interface property value in a generic class

I have this interface

public interface IMyInterface
{
    IEnumerable<MyParamInfo> Params { get; }
}

where MyParamInfo is

public class MyParamInfo 
    {
        public MyParamInfo (string name)
        {
            Name= name;
        }
        public string Name { get; private set; }
}

also this class

public class MyClass:IMyInterface
{  
   //properties
   ....  
   public IEnumerable<MyParamInfo> Params
   {
      get
        {
         return new List<MyParamInfo> { new MyParamInfo("Param1")};
        }
   }
}

and this Form

public partial class MyForm<T> : Form where T:Class,IMyInterface
{
  ...
}

with this code

MyForm<MyClass> frm = new MyForm<MyClass>();

How can I access to Params Property of MyClass in frm object?

Upvotes: 2

Views: 574

Answers (1)

Ben Reich
Ben Reich

Reputation: 16324

If you also require that the T type parameter of MyForm have a parameterless constructor, you can instantiate an instance of T and then use the interface property at will.

On the definition of MyForm, add the new() generic constraint

public partial class MyForm<T> : Form where T : Class, IMyInterface, new()

Then in some method of MyForm<T>, you can use:

(new T()).Params;

You can read about all the constraints on type parameters in C# here.

It seems like what you really want is interfaces that could specify static methods (so-called static interfaces). Such a construct does not exist in C#.

Upvotes: 3

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