diff --git a/Yi.Framework.Net6/src/module/Yi.Framework.FileManager/FileService.cs b/Yi.Framework.Net6/src/module/Yi.Framework.FileManager/FileService.cs
index 59f89626..b512206a 100644
--- a/Yi.Framework.Net6/src/module/Yi.Framework.FileManager/FileService.cs
+++ b/Yi.Framework.Net6/src/module/Yi.Framework.FileManager/FileService.cs
@@ -130,17 +130,15 @@ namespace Yi.Framework.FileManager
                         try
                         {
                             result = _thumbnailSharpManager.CreateThumbnailBytes(thumbnailSize: 300, imageStream: stream, imageFormat: Format.Jpeg);
+                            if(result is null) throw new ArgumentNullException(nameof(result));
                         }
                         catch
                         {
                             result = new byte[stream.Length];
                             stream.Read(result, 0, result.Length);
-                            // 设置当前流的位置为流的开始
-                            stream.Seek(0, SeekOrigin.Begin);
                         }
                         finally
                         {
-
                             await System.IO.File.WriteAllBytesAsync(Path.Combine(thumbnailPath, filename), result);
                         }
                     }
diff --git a/Yi.Framework.Net6/src/project/bbs/Yi.BBS.Application/Forum/DiscussService.cs b/Yi.Framework.Net6/src/project/bbs/Yi.BBS.Application/Forum/DiscussService.cs
index 5351b2a2..2009a82c 100644
--- a/Yi.Framework.Net6/src/project/bbs/Yi.BBS.Application/Forum/DiscussService.cs
+++ b/Yi.Framework.Net6/src/project/bbs/Yi.BBS.Application/Forum/DiscussService.cs
@@ -84,10 +84,11 @@ namespace Yi.BBS.Application.Forum
                  .WhereIF(!string.IsNullOrEmpty(input.Title), x => x.Title.Contains(input.Title))
                      .WhereIF(input.PlateId is not null, x => x.PlateId == input.PlateId)
                      .Where(x => x.IsTop == input.IsTop)
-                     .OrderByIF(input.Type == QueryDiscussTypeEnum.New, x => x.CreationTime, OrderByType.Desc)
-                     .OrderByIF(input.Type == QueryDiscussTypeEnum.Host, x => x.SeeNum, OrderByType.Desc)
-                      .OrderByIF(input.Type == QueryDiscussTypeEnum.Suggest, x => x.AgreeNum, OrderByType.Desc)
+
                      .LeftJoin<UserEntity>((discuss, user) => discuss.CreatorId == user.Id)
+                      .OrderByIF(input.Type == QueryDiscussTypeEnum.New, discuss => discuss.CreationTime, OrderByType.Desc)
+                     .OrderByIF(input.Type == QueryDiscussTypeEnum.Host, discuss => discuss.SeeNum, OrderByType.Desc)
+                      .OrderByIF(input.Type == QueryDiscussTypeEnum.Suggest, discuss => discuss.AgreeNum, OrderByType.Desc)
                      .Select((discuss, user) => new DiscussGetListOutputDto
                      {
                          Id=discuss.Id,