Question

In the below code “where T : WsgTypes.RouteRestriction”, can I add multiple classes so that T can be of only those few classes types which I am interested of

    public static T GetDetails<T>(string code) where T : WsgTypes.RouteRestriction
    {
        T details;
        if (typeof(T) == typeof(WsgTypes.TicketType))
        {
            details = TicketTypeDetail.GetDetails(code) as T;

        }
        else if (typeof(T) == typeof(WsgTypes.RouteRestriction))
        {
            details = RouteRestrictionDetail.GetDetails(code) as T;

        }
        else
        {
            throw new NotSupportedException("");
        }
        return details;
        throw new NotImplementedException();
    }

Answer 1

For inheritance you can have a single class with multiple interfaces.

public static T GetDetails<T>(string code) where T : WsgTypes.RouteRestriction, , IComparable
    {
    }

Instead you can have an interface and have multiple classes implementing it.

public interface IInterface
    {}

    public class Class1: IInterface
    {}

    public class Class2: IInterface
    {}

public static T GetDetails<T>(string code) where T:IInterface
        {
            T instance;
            // ...
            return instance;
        }