using System;

using System.Collections.Generic;

​

public class Program

{

    public static void Main()

    {

        var f1 = new TextField();

        var f2 = new NumberField();

        var fields = new List<IFormInput>();

        //Works now...

        fields.Add(f1);

​

        Console.WriteLine("Hello World");

    }

}

​

public class IFormInput

{

    public dynamic ParsedValue;

}

​

public class FormInput<T> : IFormInput{

    public T ParsedValue {get; set;}

}

​

public class TextField : FormInput<string>

{}

​

public class NumberField : FormInput<decimal>

{}