#884 修复Win10下无法自定义新标签页背景图

src/BiliLite.UWP/Extensions/FileExtensions.cs

@@ -23,5 +23,19 @@ public static async Task<StorageFile> GetExportFile(string fileTypeChoiceKey, st
             var file = await savePicker.PickSaveFileAsync();
             return file;
         }
+
+        public static async Task<bool> CheckFileExist(this string path)
+        {
+            try
+            {
+                var file = await StorageFile.GetFileFromPathAsync(path);
+                return file != null;
+            }
+            catch (Exception)
+            {
+                // 如果文件不存在或者路径无效，将捕获异常
+                return false;
+            }
+        }
     }
 }

src/BiliLite.UWP/Pages/NewPage.xaml.cs

@@ -41,7 +41,7 @@ private async void SetBackground()
             }
             else
             {
-                if (!File.Exists(background))
+                if (!await background.CheckFileExist())
                 {
                     Notify.ShowMessageToast("背景图片不存在,请重新设置");
                     return;