SharpFileDialog/NativeFileDialog.cs at master · TheDearbear/SharpFileDialog · GitHub

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// .NET Standard 2.1 OR >= .NET Core 3.0
#if (!NETSTANDARD2_0 && NETSTANDARD2_0_OR_GREATER) || NETCOREAPP3_0_OR_GREATER
#define USE_NOTNULLWHEN
#endif

using System;
using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
using System.Linq;
using System.Reflection;

namespace SharpFileDialog
{
    public static class NativeFileDialog
    {
        public static bool CurrentPlatformSupported => Provider is not null;

        public static INativeDialogProvider? Provider { get; set; }

        static bool _providerSearched = false;

        public static bool SetDefaultProvider()
        {
            _providerSearched = true;
            var previousProvider = Provider;
            Assembly currentAssembly = Assembly.GetExecutingAssembly();
            IEnumerable<Type> nativeProviders = currentAssembly.GetTypes().Where(type => type.GetInterface(nameof(INativeDialogProvider)) is not null);

            foreach (Type nativeProvider in nativeProviders)
            {
                try
                {
                    if (Activator.CreateInstance(nativeProvider) is INativeDialogProvider provider)
                    {
                        if (!provider.CurrentPlatformSupported)
                            continue;

                        if (Provider is null || Provider.Priority < provider.Priority)
                            Provider = provider;
                    }
                }
                catch { }
            }

            return Provider != previousProvider;
        }

#if USE_NOTNULLWHEN
        public static bool OpenDialog(Filter[]? filters, string? defaultPath, [NotNullWhen(true)] out string? outPath)
#else
        public static bool OpenDialog(Filter[]? filters, string? defaultPath, out string? outPath)
#endif
        {
            INativeDialogProvider provider = EnsureProviderAvailable();

            return provider.OpenDialog(filters, defaultPath, out outPath);
        }

#if USE_NOTNULLWHEN
        public static bool OpenDialogMultiple(Filter[]? filters, string? defaultPath, [NotNullWhen(true)] out string[]? outPaths)
#else
        public static bool OpenDialogMultiple(Filter[]? filters, string? defaultPath, out string[]? outPaths)
#endif
        {
            INativeDialogProvider provider = EnsureProviderAvailable();

            return provider.OpenDialogMultiple(filters, defaultPath, out outPaths);
        }

#if USE_NOTNULLWHEN
        public static bool SaveDialog(Filter[]? filters, string? defaultPath, [NotNullWhen(true)] out string? outPath)
#else
        public static bool SaveDialog(Filter[]? filters, string? defaultPath, out string? outPath)
#endif
        {
            INativeDialogProvider provider = EnsureProviderAvailable();

            return provider.SaveDialog(filters, defaultPath, out outPath);
        }

#if USE_NOTNULLWHEN
        public static bool PickFolder(string? defaultPath, [NotNullWhen(true)] out string? outPath)
#else
        public static bool PickFolder(string? defaultPath, out string? outPath)
#endif
        {
            INativeDialogProvider provider = EnsureProviderAvailable();

            return provider.PickFolder(defaultPath, out outPath);
        }

        static INativeDialogProvider EnsureProviderAvailable()
        {
            if (!_providerSearched)
                SetDefaultProvider();

            if (Provider is null)
                throw new PlatformNotSupportedException("Dialog provider for current platform is not available!");

            return Provider;
        }

        public struct Filter
        {
            public string Name;
            public string[] Extensions;
        }
    }
}