Iterate Though IEnumerable<String> to populate List<DTO> MVC C#

问题

Can anyone help with a problem i have, im trying to write a method that will return a list of my DTO objects

I am getting the user by the usrCode and and the getting a list of their jobCodes in the DB. Then i am getting a list of All Jobs from WCF. I then want to make a new list with the jobDescription attached the DTO as the DB only has userCode and jobCode. What i want is a list of JobDescription from my WCF but from a list of Jobs a user DOESNT have. via this....

List<UserJobsDTO> list = listBuilder(jobs, yetToHave);

Currently i have only this, i have managed to get a list of jobCodes a user doesnt have but i need jobDescriptions... Can anyone help me complete my method?

 public ActionResult addJob(string usrCode)
    {
        var jobs = jobsClient.GetAlljobs();
        var alljobsCode = (from s in jobs select s.jobsCode).ToList();
        var thisUserJobCode = (from s in db.UserJobs
                                   where s.usrCode == usrCode
                                   select s.jobsCode).ToList(); 
        var yetToHave = alljobsCode.Except(thisUserJobCode);
        List<UserJobsDTO> list = listBuilder(jobs, yetToHave);
        ViewBag.jobsCode = new SelectList(list, "jobsCode", "jobDescription");
        var model = new UserJob { usrCode = usrCode };
        return View("addJob", model);
    }

    private List<UserJobsDTO> listBuilder(jobsService.jobsDTO[] jobs, IEnumerable<string> yetToHave)
    {
        foreach (string s in yetToHave)
        {
           for every yetToHave job
           attach description to UserJobsDTO.Description
        }
    }

DTO:

public class UserJobsDTO
{
    public String userCode { get; set; }
    public String jobsCode { get; set; }
    public String jobDescription { get; set; }
}

回答1:

You can use the LINQ Contains method with ! ( That means not contains)

Assuming jobsClient.GetAlljobs() returns a collection of UserJobsDTO DTO.

//Get all Jobs
var allJobs = jobsClient.GetAlljobs().ToList();

//Get a list of Job code this user
var thisUsersJobCodeList = (from s in db.UserJobs where s.usrCode == usrCode
                               select s.jobsCode).ToList(); 

//Get items from all jobs except the items in thisUsersJobCodeList 
var yetToHave = allJobs.Where(s => !thisUsersJobCodeList .Contains(s.jobsCode)).ToList();

//Convert to a List<SelectListItem> for dropdown
var dropDownData = yetToHave.Select(s => new SelectListItem 
                                 { Value = s.jobsCode, Text = s.jobDescription}).ToList();

ViewBag.jobsCode = dropDownData;

来源：https://stackoverflow.com/questions/34966533/iterate-though-ienumerablestring-to-populate-listdto-mvc-c-sharp