Question

I have a List in which I select users from db each time a sql query runs with certain value and selects one user in the time thus I cannot limit identical users in sql.

I have list with:

list[0] = "jerry"
list[1] = "tom"
list[2] = "jerry"

I want any (first or last doesn’t matter in my case) to be removed from the list.

Thanks

Answer 1

LINQ can solve this:

List<string> names = new List<string> { "Tom", "Jerry", "Tom" };
IQueryable<string> distinctItems = names.Distinct();

If you want a list type, simply call ToList():

distinctItems.ToList();

Here’s an example from the MSDN.

EDIT: Non-LINQ Example (using Contains() from the List class):

List<string> names = new List<string> { "Tom", "Jerry", "Tom" };
List<string> distinctNames = new List<string>();
foreach (var name in names)
{
    if (!distinctNames.Contains(name))
    {
        distinctNames.Add(name);
    }
}