Make use of C# 14 features

DiscordChatExporter.Gui/Utils/Extensions/AvaloniaExtensions.cs

@@ -6,28 +6,31 @@ namespace DiscordChatExporter.Gui.Utils.Extensions;
 
 internal static class AvaloniaExtensions
 {
-    public static Window? TryGetMainWindow(this IApplicationLifetime lifetime) =>
-        lifetime is IClassicDesktopStyleApplicationLifetime desktopLifetime
-            ? desktopLifetime.MainWindow
-            : null;
-
-    public static TopLevel? TryGetTopLevel(this IApplicationLifetime lifetime) =>
-        lifetime.TryGetMainWindow()
-        ?? (lifetime as ISingleViewApplicationLifetime)?.MainView?.GetVisualRoot() as TopLevel;
-
-    public static bool TryShutdown(this IApplicationLifetime lifetime, int exitCode = 0)
+    extension(IApplicationLifetime lifetime)
     {
-        if (lifetime is IClassicDesktopStyleApplicationLifetime desktopLifetime)
-        {
-            return desktopLifetime.TryShutdown(exitCode);
-        }
+        public Window? TryGetMainWindow() =>
+            lifetime is IClassicDesktopStyleApplicationLifetime desktopLifetime
+                ? desktopLifetime.MainWindow
+                : null;
 
-        if (lifetime is IControlledApplicationLifetime controlledLifetime)
-        {
-            controlledLifetime.Shutdown(exitCode);
-            return true;
-        }
+        public TopLevel? TryGetTopLevel() =>
+            lifetime.TryGetMainWindow()
+            ?? (lifetime as ISingleViewApplicationLifetime)?.MainView?.GetVisualRoot() as TopLevel;
 
-        return false;
+        public bool TryShutdown(int exitCode = 0)
+        {
+            if (lifetime is IClassicDesktopStyleApplicationLifetime desktopLifetime)
+            {
+                return desktopLifetime.TryShutdown(exitCode);
+            }
+
+            if (lifetime is IControlledApplicationLifetime controlledLifetime)
+            {
+                controlledLifetime.Shutdown(exitCode);
+                return true;
+            }
+
+            return false;
+        }
     }
 }

DiscordChatExporter.Gui/Utils/Extensions/DisposableExtensions.cs

@@ -6,23 +6,26 @@ namespace DiscordChatExporter.Gui.Utils.Extensions;
 
 internal static class DisposableExtensions
 {
-    public static void DisposeAll(this IEnumerable<IDisposable> disposables)
+    extension(IEnumerable<IDisposable> disposables)
     {
-        var exceptions = default(List<Exception>);
-
-        foreach (var disposable in disposables)
+        public void DisposeAll()
         {
-            try
-            {
-                disposable.Dispose();
-            }
-            catch (Exception ex)
-            {
-                (exceptions ??= []).Add(ex);
-            }
-        }
+            var exceptions = default(List<Exception>);
 
-        if (exceptions?.Any() == true)
-            throw new AggregateException(exceptions);
+            foreach (var disposable in disposables)
+            {
+                try
+                {
+                    disposable.Dispose();
+                }
+                catch (Exception ex)
+                {
+                    (exceptions ??= []).Add(ex);
+                }
+            }
+
+            if (exceptions?.Any() == true)
+                throw new AggregateException(exceptions);
+        }
     }
 }

DiscordChatExporter.Gui/Utils/Extensions/NotifyPropertyChangedExtensions.cs

@@ -7,50 +7,47 @@ namespace DiscordChatExporter.Gui.Utils.Extensions;
 
 internal static class NotifyPropertyChangedExtensions
 {
-    public static IDisposable WatchProperty<TOwner, TProperty>(
-        this TOwner owner,
-        Expression<Func<TOwner, TProperty>> propertyExpression,
-        Action callback,
-        bool watchInitialValue = false
-    )
+    extension<TOwner>(TOwner owner)
         where TOwner : INotifyPropertyChanged
     {
-        var memberExpression = propertyExpression.Body as MemberExpression;
-        if (memberExpression?.Member is not PropertyInfo property)
-            throw new ArgumentException("Provided expression must reference a property.");
-
-        void OnPropertyChanged(object? sender, PropertyChangedEventArgs args)
+        public IDisposable WatchProperty<TProperty>(
+            Expression<Func<TOwner, TProperty>> propertyExpression,
+            Action callback,
+            bool watchInitialValue = false
+        )
         {
-            if (
-                string.IsNullOrWhiteSpace(args.PropertyName)
-                || string.Equals(args.PropertyName, property.Name, StringComparison.Ordinal)
-            )
+            var memberExpression = propertyExpression.Body as MemberExpression;
+            if (memberExpression?.Member is not PropertyInfo property)
+                throw new ArgumentException("Provided expression must reference a property.");
+
+            void OnPropertyChanged(object? sender, PropertyChangedEventArgs args)
             {
-                callback();
+                if (
+                    string.IsNullOrWhiteSpace(args.PropertyName)
+                    || string.Equals(args.PropertyName, property.Name, StringComparison.Ordinal)
+                )
+                {
+                    callback();
+                }
             }
+
+            owner.PropertyChanged += OnPropertyChanged;
+
+            if (watchInitialValue)
+                callback();
+
+            return Disposable.Create(() => owner.PropertyChanged -= OnPropertyChanged);
         }
 
-        owner.PropertyChanged += OnPropertyChanged;
+        public IDisposable WatchAllProperties(Action callback, bool watchInitialValues = false)
+        {
+            void OnPropertyChanged(object? sender, PropertyChangedEventArgs args) => callback();
+            owner.PropertyChanged += OnPropertyChanged;
 
-        if (watchInitialValue)
-            callback();
+            if (watchInitialValues)
+                callback();
 
-        return Disposable.Create(() => owner.PropertyChanged -= OnPropertyChanged);
-    }
-
-    public static IDisposable WatchAllProperties<TOwner>(
-        this TOwner owner,
-        Action callback,
-        bool watchInitialValues = false
-    )
-        where TOwner : INotifyPropertyChanged
-    {
-        void OnPropertyChanged(object? sender, PropertyChangedEventArgs args) => callback();
-        owner.PropertyChanged += OnPropertyChanged;
-
-        if (watchInitialValues)
-            callback();
-
-        return Disposable.Create(() => owner.PropertyChanged -= OnPropertyChanged);
+            return Disposable.Create(() => owner.PropertyChanged -= OnPropertyChanged);
+        }
     }
 }

DiscordChatExporter.Gui/Utils/Extensions/ProcessExtensions.cs

@@ -0,0 +1,17 @@
+using System.Diagnostics;
+
+namespace DiscordChatExporter.Gui.Utils.Extensions;
+
+internal static class ProcessExtensions
+{
+    extension(Process)
+    {
+        public static void StartShellExecute(string path)
+        {
+            using var process = new Process();
+            process.StartInfo = new ProcessStartInfo { FileName = path, UseShellExecute = true };
+
+            process.Start();
+        }
+    }
+}