CODEWITHSUNDEEP
c#linqlist
junni lomo
junni lomo

Reputation: 779

rearranging the elements in list

Hi just needed suggestion regarding List /LINQ etc

public  static List<Employee> Employees()
       {
          return Adapters.WebServiceAdapter.getInstance.SELECT_EMPLOYEES().ToList();
       }

This is returning USERID , USERNAME in ASC order of USERID as below

   USERID USERNAME
        1      FirstUser
        2      SecondUser
        3      ThirdUser
        4      FourthUser
        5      FifthUser

I have requirement of rearranging the output based on the currently logged Employee.

For Example i have information that USERID 4TH IS LOGGED in my website then this function should return me 

 USERID USERNAME
    4     FourthUser
    1     FirstUser
    2     SECONDUSER
    3     THIRDUSER
    5     FIFTHUSER

Just to give reason why i am doing this - I have a drop-downs various places in my website and i want to ensure that if this function is called to load my dropdown lists . By default the currently logged user should be selected by default.

I appreciate if someone could provide valuable inputs..

Upvotes: 0

Views: 60

Answers (2)

terrybozzio
terrybozzio

Reputation: 4532

You can also try this trick: Insert your logged user in position 0 of the list, then call distinct.

MyList.Insert(0,MyList.Single(c => c.UserID == IDofLoggedUser));
var lst = MyList.Distinct();

Result:

the original list ordered by ID like you have
MyList = 1,2,3,4,5,6;
then insert for example logged user has ID of 4
MyList = 4,1,2,3,4,5,6;
then call distinct,it will find and maintain the first 4,and remove second 4, so final result:
MyList = 4,1,2,3,5,6;

Upvotes: 0

Justin Pihony
Justin Pihony

Reputation: 67115

Just combine two lists using Union

Link's Code:

    var numbers = new List<Int32>{1,2,3,4,5};
    var loggedInUsers = numbers.Where(x=>x == 4);
    var restOfUsers = numbers.Where(x=>x != 4);
    var joinedLists = loggedInUsers.Union(restOfUsers).ToList();

Upvotes: 1

Related Questions