C# 8.0 のnull許容参照型を有効化

[opentween/open-tween.git] / OpenTween / Thumbnail / ThumbnailGenerator.cs

diff --git a/OpenTween/Thumbnail/ThumbnailGenerator.cs b/OpenTween/Thumbnail/ThumbnailGenerator.cs
index e303fb3..9a207c3 100644 (file)
--- a/OpenTween/Thumbnail/ThumbnailGenerator.cs
+++ b/OpenTween/Thumbnail/ThumbnailGenerator.cs
@@ -19,6 +19,8 @@
 // the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
 // Boston, MA 02110-1301, USA.
 
+#nullable enable
+
 using System;
 using System.Collections.Generic;
 using System.Linq;
@@ -183,7 +185,7 @@ namespace OpenTween.Thumbnail
             return thumbnails;
         }
 
-        public static async Task<ThumbnailInfo> GetThumbnailInfoAsync(string url, PostClass post, CancellationToken token)
+        public static async Task<ThumbnailInfo?> GetThumbnailInfoAsync(string url, PostClass post, CancellationToken token)
         {
             foreach (var generator in ThumbnailGenerator.Services)
             {