diff --git a/Admin.NET/Admin.NET.Core/Service/File/SysFileService.cs b/Admin.NET/Admin.NET.Core/Service/File/SysFileService.cs
index 5c5f715b..82221aea 100644
--- a/Admin.NET/Admin.NET.Core/Service/File/SysFileService.cs
+++ b/Admin.NET/Admin.NET.Core/Service/File/SysFileService.cs
@@ -344,4 +344,44 @@ public class SysFileService : IDynamicApiController, ITransient
         }
         return sysFile;
     }
+
+    #region 统一实体与文件关联时，业务应用实体只需要定义一个SysFile集合导航属性，业务增加和更新、删除分别调用即可
+
+    /// <summary>
+    /// 更新文件的业务数据Id
+    /// </summary>
+    /// <param name="dataId"></param>
+    /// <param name="sysFiles"></param>
+    /// <returns></returns>
+    [NonAction]
+    public async Task UpdateFileByDataId(long dataId, List<SysFile> sysFiles)
+    {
+        var newFileIds = sysFiles.Select(u => u.Id).ToList();
+
+        // 求文件Id差集并删除（无效文件）
+        var tmpFiles = await _sysFileRep.GetListAsync(u => u.DataId == dataId);
+        var tmpFileIds = tmpFiles.Select(u => u.Id).ToList();
+        var deleteFileIds = tmpFileIds.Except(newFileIds);
+        foreach (var fileId in deleteFileIds)
+            await DeleteFile(new DeleteFileInput() { Id = fileId });
+
+        await _sysFileRep.UpdateAsync(u => new SysFile() { DataId = dataId }, u => newFileIds.Contains(u.Id));
+    }
+
+    /// <summary>
+    /// 删除业务数据对应的文件
+    /// </summary>
+    /// <param name="dataId"></param>
+    /// <returns></returns>
+    [NonAction]
+    public async Task DeteleFileByDataId(long dataId)
+    {
+        // 删除冗余无效的物理文件
+        var tmpFiles = await _sysFileRep.GetListAsync(u => u.DataId == dataId);
+        foreach (var file in tmpFiles)
+            await _customFileProvider.DeleteFileAsync(file);
+        await _sysFileRep.AsDeleteable().Where(u => u.DataId == dataId).ExecuteCommandAsync();
+    }
+
+    #endregion 统一实体与文件关联时，业务应用实体只需要定义一个SysFile集合导航属性，业务增加和更新、删除分别调用即可
 }
\ No newline at end of file