在 MVC5 中使用 LINQ 和 C#

Question

I am stuck on a problem I can't seem to solve. What I want to do is use a Sort lambda on a database by their last names.

EmployeesController:

public ActionResult Index()
    {
        return View(m.EmployeeGetAll());
    }

manager.cs:

public IEnumerable<EmployeeBase> EmployeeGetAll()
    {
        //use automapper to map objects, source to target
        return mapper.Map<IEnumerable<Employee>, IEnumerable<EmployeeBase>>(ds.Employees);
    }

Database value:

    [Required]
    [StringLength(20)]
    public string LastName { get; set; }

with the above methods it is fine to show a list of all the employees in the db, but where in my controller or methods do i use the lamda? I am basically stuck on if you make a method() in the manager.cs and use lambdas within it to return an object, how do you call this for the index view? As i want when the page loads for the last names to be sorted. Any help is appreciated.

Answer 1

I think you should sort in database level, like this:

    public IEnumerable<EmployeeBase> EmployeeGetAll()
    {
      var all=ds.Employees.OrderBy(e=>e.LastName);
        //use automapper to map objects, source to target
     return mapper.Map<IEnumerable<Employee>, IEnumerable<EmployeeBase>>(all);
    }