DiscordChatExporter/DiscordChatExporter.Gui/Framework/UserControl.cs

using System;
using Avalonia.Controls;

namespace DiscordChatExporter.Gui.Framework;

public class UserControl<TDataContext> : UserControl
{
    public new TDataContext DataContext
    {
        get =>
            base.DataContext is TDataContext dataContext
                ? dataContext
                : throw new InvalidCastException(
                    $"DataContext is null or not of the expected type '{typeof(TDataContext).FullName}'."
                );
        set => base.DataContext = value;
    }
}