排序修改

src/Shentun.Peis.Domain/EntityHelper.cs

@@ -115,6 +115,8 @@ namespace Shentun.Peis
             {
                 UptList = (await repository.GetListAsync(o => o.DisplayOrder < entity.DisplayOrder)).OrderByDescending(o => o.DisplayOrder).ToList(); ;
 
+                if (UptList.Count > 0)
+                {
                     int indexnum = entity.DisplayOrder;  //原有值
 
                     entity.DisplayOrder = UptList[UptList.Count - 1].DisplayOrder;  //修改当前排序值为最小  
@@ -127,6 +129,7 @@ namespace Shentun.Peis
                         indexnum = dqnum;
                     }
                 }
+            }
 
 
             UptList.Add(entity);
@@ -603,7 +606,7 @@ namespace Shentun.Peis
         /// </summary>
         /// <param name="UserId"></param>
         /// <returns></returns>
-        private static async Task<string> GetUserNameFromCache( Guid? UserId)
+        private static async Task<string> GetUserNameFromCache(Guid? UserId)
         {