opt:增加判空操作

BPA.SAAS.Manage.Application/DataBase/Services/GoodsAttributeService.cs

@@ -123,15 +123,18 @@ namespace BPA.Franchisee.Application.FranchiseeCenter.GoodsServices
                         foreach (var item in dto.GoodsAttributeValueList)
                         {
                             var updateselect = dellist.FirstOrDefault(x => x.Id == item.Id);
-                            if (updateselect.AttributeValue!=item.AttributeValue|| updateselect.Sort!=item.Sort)
+                            if (updateselect!=null)
                             {
-                                //更新
-                                BPA_GoodsAttributeValue GoodsAttributeValue = new();
-                                GoodsAttributeValue.Id = item.Id;
-                                GoodsAttributeValue.AttributeValue =item.AttributeValue;
-                                GoodsAttributeValue.GoodsAttributeId = dto.Id;
-                                GoodsAttributeValue.Sort = item.Sort;
-                                res = await _db.Updateable(GoodsAttributeValue).IgnoreColumns(ignoreAllNullColumns: true).ExecuteCommandAsync();
+                                if (updateselect.AttributeValue != item.AttributeValue || updateselect.Sort != item.Sort)
+                                {
+                                    //更新
+                                    BPA_GoodsAttributeValue GoodsAttributeValue = new();
+                                    GoodsAttributeValue.Id = item.Id;
+                                    GoodsAttributeValue.AttributeValue = item.AttributeValue;
+                                    GoodsAttributeValue.GoodsAttributeId = dto.Id;
+                                    GoodsAttributeValue.Sort = item.Sort;
+                                    res = await _db.Updateable(GoodsAttributeValue).IgnoreColumns(ignoreAllNullColumns: true).ExecuteCommandAsync();
+                                }
                             }
                             //查询id是否存在
                             if (string.IsNullOrWhiteSpace(item.GoodsAttributeId))