async private void DeleteUser(string username)
        {
            var dt = serviceClient.GetUserInfo(username).Tables[0];

            if (dt.Rows.Count < 1)
            {
                return;
            }
            var roleID = dt.Rows[0][0].ToString();

            if (roleID == "0")//admin
            {
                return;
            }
            if (MessageBox.Show($"确认要删除用户【{username}】?", "提示", MessageBoxButtons.OKCancel, MessageBoxIcon.Warning) != DialogResult.OK)
            {
                return;
            }
            int delV = await serviceClient.DeleteUserAsync(username);

            if (delV == 1)
            {
                SelectAllUser();
                MessageBox.Show("删除成功!", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
                return;
            }
            MessageBox.Show("删除失败!", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
        }