Merge pull request #14 from afunc233/avalonia11

LoadFromLocalAsync

AsyncImageLoader.Avalonia/Loaders/BaseWebImageLoader.cs

@@ -62,7 +62,8 @@ public void Dispose()
         /// <returns>Bitmap</returns>
         protected virtual async Task<Bitmap?> LoadAsync(string url)
         {
-            var internalOrCachedBitmap = await LoadFromInternalAsync(url) ?? await LoadFromGlobalCache(url);
+            var internalOrCachedBitmap = await LoadFromLocalAsync(url) ??
+                                         await LoadFromInternalAsync(url) ?? await LoadFromGlobalCache(url);
             if (internalOrCachedBitmap != null) return internalOrCachedBitmap;
 
             try
@@ -81,6 +82,16 @@ public void Dispose()
             }
         }
 
+        /// <summary>
+        /// the url maybe is local file url,so if file exists ,we got a Bitmap
+        /// </summary>
+        /// <param name="url"></param>
+        /// <returns></returns>
+        private Task<Bitmap?> LoadFromLocalAsync(string url)
+        {
+            return Task.FromResult(File.Exists(url) ? new Bitmap(url) : null);
+        }
+
         /// <summary>
         ///     Receives image bytes from an internal source (for example, from the disk).
         ///     This data will be NOT cached globally (because it is assumed that it is already in internal source us and does not