show not found if no result

src/Snap.Hutao/Snap.Hutao/Control/AutoSuggestBox/AutoSuggestTokenBox.cs

@@ -48,7 +48,7 @@ internal sealed partial class AutoSuggestTokenBox : TokenizingTextBox
 
         if (args.Reason == AutoSuggestionBoxTextChangeReason.UserInput)
         {
-            sender.ItemsSource = AvailableTokens.Values.Where(q => q.Value.Contains(Text, StringComparison.OrdinalIgnoreCase));
+            sender.ItemsSource = AvailableTokens.Values.WhereOrDefault(q => q.Value.Contains(Text, StringComparison.OrdinalIgnoreCase), [SearchToken.NotFound]);
         }
     }
 

src/Snap.Hutao/Snap.Hutao/Control/AutoSuggestBox/SearchToken.cs

@@ -7,6 +7,8 @@ namespace Snap.Hutao.Control.AutoSuggestBox;
 
 internal sealed class SearchToken
 {
+    public static readonly SearchToken NotFound = new(SearchTokenKind.None, SH.ControlAutoSuggestBoxNotFoundValue);
+
     public SearchToken(SearchTokenKind kind, string value, Uri? iconUri = null, Uri? sideIconUri = null, Color? quality = null)
     {
         Value = value;

src/Snap.Hutao/Snap.Hutao/Extension/EnumerableExtension.cs

@@ -123,4 +123,9 @@ internal static partial class EnumerableExtension
     {
         return string.Join(separator, collection);
     }
+
+    public static IEnumerable<TSource> WhereOrDefault<TSource>(this IEnumerable<TSource> source, Func<TSource, bool> predicate, IEnumerable<TSource> defaultValue)
+    {
+        return source.Where(predicate).Any() ? source : defaultValue;
+    }
 }

src/Snap.Hutao/Snap.Hutao/Resource/Localization/SH.en.resx

@@ -144,6 +144,9 @@
   <data name="ContentDialogSavePrimaryButtonText" xml:space="preserve">
     <value>Save</value>
   </data>
+  <data name="ControlAutoSuggestBoxNotFoundValue" xml:space="preserve">
+    <value>No results found</value>
+  </data>
   <data name="ControlImageCachedImageInvalidResourceUri" xml:space="preserve">
     <value>Invalid Uri</value>
   </data>

src/Snap.Hutao/Snap.Hutao/Resource/Localization/SH.resx

@@ -144,6 +144,9 @@
   <data name="ContentDialogSavePrimaryButtonText" xml:space="preserve">
     <value>保存</value>
   </data>
+  <data name="ControlAutoSuggestBoxNotFoundValue" xml:space="preserve">
+    <value>未找到结果</value>
+  </data>
   <data name="ControlImageCachedImageInvalidResourceUri" xml:space="preserve">
     <value>无效的 Uri</value>
   </data>