按字母顺序对 Linq 结果进行排序

Question

I have List of name I need to sort in alphabetical order, but its not sorting as expected, its only bringing out similar alphabets together.

This is my code

[Route("api/getdeptemployee/{Id}")]
    [HttpGet]
    public IActionResult GetDepartmentEmp(int Id)
    {
        var item = (from o in db.Employee
                    join a in db.Department on o.DepartmentId equals a.Id
                    where a.Id == Id
                    select new
                    {
                        Id = o.Id,
                        LastName = o.LastName,
                        AddedBy = o.LastName + " " + o.FirstName
                    }).OrderBy(s => s.LastName).ToList();
        return Json(item);
    }

here is the result

{
    "id": 2277,
    "lastName": " IBIRONKE",
    "addedBy": " IBIRONKE ABIMBOLA "
},
{
    "id": 2278,
    "lastName": " IGBINOBA",
    "addedBy": " IGBINOBA PATRICIA"
},
{
    "id": 2279,
    "lastName": " IRUBOR",
    "addedBy": " IRUBOR CATHERINE "
},
{
    "id": 2276,
    "lastName": " KOLAWOLE",
    "addedBy": " KOLAWOLE SEGUN"
},
{
    "id": 2281,
    "lastName": " LAMPTEY",
    "addedBy": " LAMPTEY JOSEPH"
},
{
    "id": 2282,
    "lastName": " OJEDIRAN",
    "addedBy": " OJEDIRAN OLUWASEYI "
},
{
    "id": 2283,
    "lastName": "ADEBANJO",
    "addedBy": "ADEBANJO ABAYOMI "
},
{
    "id": 2296,
    "lastName": "ADENIYI",
    "addedBy": "ADENIYI ONI"
},
{
    "id": 2284,
    "lastName": "ADEPOJU",
    "addedBy": "ADEPOJU ABAYOMI "
},
{
    "id": 2297,
    "lastName": "AFOLABI-ONI",
    "addedBy": "AFOLABI-ONI OLUFUNKE "
},
{
    "id": 2285,
    "lastName": "AGBOM",
    "addedBy": "AGBOM MAURICE"
},
{
    "id": 2293,
    "lastName": "AKPU-AGBAKA",
    "addedBy": "AKPU-AGBAKA BYRON"
},
{
    "id": 2286,
    "lastName": "ASUQUO",
    "addedBy": "ASUQUO NAOMI "
},
{
    "id": 2299,
    "lastName": "AYI-SAMUEL",
    "addedBy": "AYI-SAMUEL BLESSING"
},
{
    "id": 2298,
    "lastName": "ECHEBIRI",
    "addedBy": "ECHEBIRI JUSTINE"
},
{
    "id": 2287,
    "lastName": "EDET ",
    "addedBy": "EDET  NSIKAK "
},
{
    "id": 2292,
    "lastName": "EZE",
    "addedBy": "EZE FAVOUR "
},
{
    "id": 2289,
    "lastName": "JABE",
    "addedBy": "JABE AJOM"
},
{
    "id": 2288,
    "lastName": "MADUNECHE",
    "addedBy": "MADUNECHE CHIDI "
},
{
    "id": 2280,
    "lastName": "MUSTAPHA",
    "addedBy": "MUSTAPHA TRACY "
},
{
    "id": 2274,
    "lastName": "OLAWOYIN",
    "addedBy": "OLAWOYIN KELECHI "
},
{
    "id": 2290,
    "lastName": "ONAA",
    "addedBy": "ONAA JAMES "
},
{
    "id": 2275,
    "lastName": "SORINWA",
    "addedBy": "SORINWA OLUFUNKE "
},
{
    "id": 2295,
    "lastName": "UGBE",
    "addedBy": "UGBE JOHN-PAUL"
},
{
    "id": 2294,
    "lastName": "UWAH",
    "addedBy": "UWAH FRANCIS"
},
{
    "id": 2291,
    "lastName": "ZOCLI",
    "addedBy": "ZOCLI ANDREW"
}

its not sorted in alphabetical order, please how do I solve this. Is there a way I can make it start from AZ, just in alphabetical order?. Thanks

Answer 1

As pointed by Aleks Andreev in the comment

Try cut spaces from lastName like OrderBy(s => s.LastName.Trim())

Answer 2

I see that some of the strings in your data have a space at the beginning. You might want to trim the strings before sorting and returning them.

Additionally, sorting in LINQ to Objects is case-sensitive, which may also be affected by the data in your database. Since you are still using LINQ to SQL (as per Panagiotis's comment), you may skip the ToLower() call and rely on database support.

Here is how you can fix your code so that data are trimmed, and sorted in case-insensitive manner (mind the calls to Trim and ToLower):

[Route("api/getdeptemployee/{Id}")]
[HttpGet]
public IActionResult GetDepartmentEmp(int Id)
{
    var item = (from o in db.Employee
                join a in db.Department on o.DepartmentId equals a.Id
                where a.Id == Id
                select new
                {
                    Id = o.Id,
                    LastName = o.LastName.Trim(),
                    AddedBy = o.LastName.Trim() + " " + o.FirstName.Trim()
                }).OrderBy(s => s.LastName.ToLower()).ToList();
    return Json(item);
}