Linq改进

原代码：

  foreach (var item in pageData)
            {
                list.Add(new tn_Manager { UserName = item.UserName, IsAudit = item.IsAudit, CreateTime = item.CreateTime, RoleName = PublicQuery.GetRoleById(item.RoleId).Name });
            }

改进之后：

var list = pageData.Select(item => new tn_Manager {UserName = item.UserName, IsAudit = item.IsAudit, CreateTime = item.CreateTime, RoleName = PublicQuery.GetRoleById(item.RoleId).Name}).ToList();