Various updates.

Harmonia.WinUI/Caching/AudioBitmapImageCache.cs

@@ -12,8 +12,6 @@ namespace Harmonia.WinUI.Caching;
 
 public class AudioBitmapImageCache(IAudioImageExtractor audioImageExtractor) : MemoryCache<Song, BitmapImage>, IAudioBitmapImageCache
 {
-    protected virtual int MaxImageWidthOrHeight => 1000;
-
     protected override MemoryCacheOptions Options => new()
     {
         SizeLimit = 200_000_000,
@@ -21,8 +19,8 @@ public class AudioBitmapImageCache(IAudioImageExtractor audioImageExtractor) : M
     };
 
     protected override TimeSpan SlidingExpiration => TimeSpan.FromSeconds(600);
-
     protected override int MaxConcurrentRequests => 8;
+    protected virtual int MaxImageWidthOrHeight => 1000;
 
     protected override object? GetKey(Song key)
     {
@@ -35,7 +33,7 @@ public class AudioBitmapImageCache(IAudioImageExtractor audioImageExtractor) : M
             return key.ImageName;
         }
 
-        return null;
+        return "Default";
     }
 
     protected override async ValueTask<BitmapImage?> FetchAsync(Song key, CancellationToken cancellationToken)
@@ -43,7 +41,7 @@ public class AudioBitmapImageCache(IAudioImageExtractor audioImageExtractor) : M
         SongPictureInfo? songPictureInfo = await audioImageExtractor.ExtractImageAsync(key.FileName, cancellationToken);
 
         if (songPictureInfo == null)
-            return null;
+            return GetDefaultBitmapImage();
 
         using MemoryStream stream = new(songPictureInfo.Data);
 
@@ -57,6 +55,18 @@ public class AudioBitmapImageCache(IAudioImageExtractor audioImageExtractor) : M
         return bitmapImage;
     }
 
+    private BitmapImage GetDefaultBitmapImage()
+    {
+        Uri uri = new("ms-appx:///Assets/Default.png", UriKind.Absolute);
+
+        BitmapImage bitmapImage = new();
+        bitmapImage.DecodePixelWidth = GetDecodePixelWidth(bitmapImage);
+        bitmapImage.DecodePixelHeight = GetDecodePixelHeight(bitmapImage);
+        bitmapImage.UriSource = uri;
+
+        return bitmapImage;
+    }
+
     private int GetDecodePixelWidth(BitmapImage bitmapImage)
     {
         int originalImageWidth = bitmapImage.PixelWidth;