Use LRU cache for icons to improve performance when changing back and forth between frequently used apps, and reduce possibility of an icon randomly not loading

src/FocusVolumeControl/AudioSessions/ActiveAudioSessionWrapper.cs

@@ -5,44 +5,57 @@ using BarRaider.SdTools;
 using System.Drawing;
 using System.Runtime.InteropServices;
 using FocusVolumeControl.UI;
+using BitFaster.Caching.Lru;
 
 namespace FocusVolumeControl.AudioSessions;
 
 public sealed class ActiveAudioSessionWrapper : IAudioSession
 {
+	static ConcurrentLru<string, string> _iconCache = new ConcurrentLru<string, string>(10);
+
 	public string DisplayName { get; set; }
 	public string ExecutablePath { get; set; }
 	public string IconPath { get; set; }
 	private List<IAudioSessionControl2> Sessions { get; } = new List<IAudioSessionControl2>();
 	private IEnumerable<ISimpleAudioVolume> Volume => Sessions.Cast<ISimpleAudioVolume>();
 
-	string _icon;
+	string GetIconFromIconPath()
+	{
+		return _iconCache.GetOrAdd(IconPath, (key) =>
+		{
+			var tmp = (Bitmap)Bitmap.FromFile(IconPath);
+			tmp.MakeTransparent();
+			return Tools.ImageToBase64(tmp, true);
+		});
+	}
+
+	string GetIconFromExecutablePath()
+	{
+		return _iconCache.GetOrAdd(ExecutablePath, (key) =>
+		{
+			var tmp = IconExtraction.GetIcon(ExecutablePath);
+			//var tmp = Icon.ExtractAssociatedIcon(ExecutablePath);
+			return Tools.ImageToBase64(tmp, true);
+		});
+	}
 
 	public string GetIcon()
 	{
-		if (string.IsNullOrEmpty(_icon))
+		try
 		{
-			try
+			if (!string.IsNullOrEmpty(IconPath))
 			{
-				if(!string.IsNullOrEmpty(IconPath))
-				{
-					var tmp = (Bitmap)Bitmap.FromFile(IconPath);
-					tmp.MakeTransparent();
-					_icon = Tools.ImageToBase64(tmp, true);
-				}
-				else
-				{
-					var tmp = IconExtraction.GetIcon(ExecutablePath);
-					//var tmp = Icon.ExtractAssociatedIcon(ExecutablePath);
-					_icon = Tools.ImageToBase64(tmp, true);
-				}
+				return GetIconFromIconPath();
 			}
-			catch
+			else
 			{
-				_icon = "Images/encoderIcon";
+				return GetIconFromExecutablePath();
 			}
 		}
-		return _icon;
+		catch
+		{
+			return "Images/encoderIcon";
+		}
 	}
 
 	public bool Any()