CODEWITHSUNDEEP
c#types
Graviton
Graviton

Reputation: 83254

Enforce Type constraint when the Type is 'Type'

I want to enforce type constraint when I define a 'type mapping' dictionary, such as this:

internal static class BindingResources
{
    /// <summary>
    /// Key== IDialogWindowVM, Value ==Window
    /// </summary>
    public static readonly Dictionary<Type, Type> ViewModelDictionary =
        new Dictionary<Type, Type>()
        {
            {typeof(CreateGroupVM), typeof(CreateGroupUI)},
            {typeof(CreateNewNetworkVM), typeof(CreateNewNetwork)}
        };
}

I want to ensure that CreateGroupVM is of the interface IDialogWindowVM, and CreateGroupUI is inherited from Window class. If these conditions are not satisfied that I shall get a compilation error instead of a runtime error.

If this even possible, if yes, how to do it? If no, why?

Upvotes: 0

Views: 35

Answers (1)

shingo
shingo

Reputation: 27021

You can use a helper method.

public static Dictionary<Type, Type> ViewModelDictionary
{
    get
    {
        var d = new Dictionary<Type, Type>();

        void Add<U, V>()
        where U : IDialogWindowVM
        where V : Window => d.Add(typeof(U), typeof(V));

        Add<CreateGroupVM, CreateGroupUI>();
        Add<CreateNewNetworkVM, CreateNewNetwork>();

        return d;
    }
}

Upvotes: 1

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