//// custom codes
public virtual async Task <string> GetNextChildCodeAsync(Guid?parentId)
{
var lastChild = await GetLastChildOrNullAsync(parentId);
if (lastChild == null)
{
var parentCode = parentId != null ? await GetCodeAsync(parentId.Value) : null;
return(SysFile.AppendCode(parentCode, SysFile.CreateCode(1)));
}
return(SysFile.CalculateNextCode(lastChild.Code));
}
