DesignTimeGuard.cs

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using System;
using System.ComponentModel;
using System.Windows;
 
namespace Dreamine.Hybrid.Wpf.Utility
{
    public static class DesignTimeGuard
    {
        private static readonly bool _isInDesignMode = DetectDesignMode();

        public static bool IsInDesignMode => _isInDesignMode;

        private static bool DetectDesignMode()
        {
            try
            {
                if (Application.Current?.Dispatcher is { } dispatcher &&
                    !dispatcher.CheckAccess())
                {
                    return false;
                }
 
                return DesignerProperties.GetIsInDesignMode(new DependencyObject());
            }
            catch (InvalidOperationException)
            {
                return false;
            }
        }
    }
}