清理ViewBag'；s在GET和POST中

我一直在使用viewbags来填充我的视图上的下拉列表，我想知道是否有办法清理这些代码。我已经做了一段时间了，我讨厌它的外观，它让所有的代码看起来非常混乱，并且不得不在Get和Post操作中重复它。还有别的办法吗？

以下是代码的样子：

[HttpGet]
public ActionResult EmployeeEdit(int id)
{
    var employee = _employeeDb.EmployeeMasters.FirstOrDefault(e => e.ID == id);
    var nextReview = _employeeDb.EmployeeReviews.OrderByDescending(e => e.ReviewDate).FirstOrDefault(e => e.EmployeeNo == employee.EmployeeNumber);
    ViewBag.NextReviewDate = nextReview != null ? nextReview.ReviewDate.Value.ToShortDateString() : "Add Review Date";
    ViewBag.CompanyList = _selectListLib.GetCompanies((int)employee.CompanyNumber);
    ViewBag.BranchList = _selectListLib.GetBranches((int)employee.CompanyNumber, employee.Branch);
    ViewBag.departmentList = employee.DepartmentNumber != null ? _selectListLib.GetDepartments((int)employee.CompanyNumber, (int)employee.DepartmentNumber) : _selectListLib.GetDepartments((int)employee.CompanyNumber);
    ViewBag.EmployeeTypesList = _selectListLib.GetEmployeeTypes(employee.EmployeeType);
    ViewBag.PayTypesList = _selectListLib.GetPayTypes(employee.PayType);
    ViewBag.StatusList = employee.StatusFlag != null ? _selectListLib.GetStatusTypes((bool)employee.StatusFlag) : _selectListLib.GetStatusTypes();
    ViewBag.LastEditLabel = MakeLastEditString((int)employee.EmployeeNumber);
    ViewBag.Managers = employee.ManagerEmpNo != null ? _selectListLib.GetManagers((int) employee.CompanyNumber, (int) employee.ManagerEmpNo) : _selectListLib.GetManagers((int)employee.CompanyNumber);
    return View(employee);
}
[HttpPost]
public ActionResult EmployeeEdit(Models.EmployeeMaster employee)
{
    var nextReview = _employeeDb.EmployeeReviews.OrderByDescending(e => e.ReviewDate).FirstOrDefault(e => e.EmployeeNo == employee.EmployeeNumber);
    ViewBag.NextReviewDate = nextReview != null ? nextReview.ReviewDate.Value.ToShortDateString() : "Add Review Date";
    ViewBag.CompanyList = _selectListLib.GetCompanies((int)employee.CompanyNumber);
    ViewBag.BranchList = _selectListLib.GetBranches((int)employee.CompanyNumber, employee.Branch);
    ViewBag.departmentList = employee.DepartmentNumber != null ? _selectListLib.GetDepartments((int)employee.CompanyNumber, (int)employee.DepartmentNumber) : _selectListLib.GetDepartments((int)employee.CompanyNumber);
    ViewBag.EmployeeTypesList = _selectListLib.GetEmployeeTypes(employee.EmployeeType);
    ViewBag.PayTypesList = _selectListLib.GetPayTypes(employee.PayType);
    ViewBag.StatusList = employee.StatusFlag != null ? _selectListLib.GetStatusTypes((bool)employee.StatusFlag) : _selectListLib.GetStatusTypes();
    ViewBag.Managers = employee.ManagerEmpNo != null ? _selectListLib.GetManagers((int)employee.CompanyNumber, (int)employee.ManagerEmpNo) : _selectListLib.GetManagers((int)employee.CompanyNumber);
    if (!ModelState.IsValid) return View(employee);
    var result = _dbDataManipulation.UpdateEmployee((int)employee.CompanyNumber, employee.Initials, employee.FirstName, employee.LastName, (int)employee.DepartmentNumber, employee.EmployeeNumber.ToString(),
        employee.EmployeeType, (bool)employee.EnterTimeFl, Convert.ToDateTime(employee.StartDate), employee.PayType, (decimal)employee.Rate, (int)employee.UnionNo, employee.Branch, employee.G2ID, employee.JobTitle, CurrentUserName(),(bool)employee.StatusFlag, employee.MiddleName,(int)employee.ManagerEmpNo)
        ;
    ViewBag.Message = result;
    if (result != null)
        return View(employee);
    return RedirectToAction("Default");
}