优化这段代码： var surGivenName = RemoteHelper.GetNameInfo(userName); var listData = listAllUsers?.Select(c => new DtEmployee { OutEmployeeId = c.LoginId, SurName = surGivenName.SurName, GivenName = surGivenName.GivenName, Gender = c.Sex == "F" ? (int)Sex.女 : (int)Sex.男, ReservationType = (int)ReservationType.仅限本人, CredentialType=(int)CredentialType.身份证, Email = c.Email, Mobile = c.MobilePhone, IdCard=c.IDCard, WorkingState = string.Equals(c.Status, "enabled", StringComparison.OrdinalIgnoreCase) ? (int)WorkingState.在职 : (int)WorkingState.离职 }).ToList();

为了优化这段代码，可以考虑将获取 surGivenName 的操作放在循环外面，避免重复调用 RemoteHelper.GetNameInfo(userName) 方法。

可以将 surGivenName.SurName 和 surGivenName.GivenName 存储到一个临时变量中，然后在循环中使用该变量。

另外，可以使用三元运算符简化 c.Sex == "F" ? (int)Sex.女 : (int)Sex.男 的写法。

下面是优化后的代码：

var surGivenName = RemoteHelper.GetNameInfo(userName);
var surName = surGivenName.SurName;
var givenName = surGivenName.GivenName;

var listData = listAllUsers?.Select(c => new DtEmployee
{
OutEmployeeId = c.LoginId,
SurName = surName,
GivenName = givenName,
Gender = c.Sex == "F" ? (int)Sex.女 : (int)Sex.男,
ReservationType = (int)ReservationType.仅限本人,
CredentialType = (int)CredentialType.身份证,
Email = c.Email,
Mobile = c.MobilePhone,
IdCard = c.IDCard,
WorkingState = string.Equals(c.Status, "enabled", StringComparison.OrdinalIgnoreCase) ? (int)WorkingState.在职 : (int)WorkingState.离职
}).ToList();

这样，代码就避免了重复调用 RemoteHelper.GetNameInfo(userName) 方法，提高了效率。同时，使用临时变量存储 surGivenName.SurName 和 surGivenName.GivenName，使代码更简洁易读。