Remove an item from an IEnumerable collection

Question

I have a popuplated IEnumerable collection.

I want to remove an item from it, how can I do this?

foreach(var u in users)
{
          


        

Answer 1

You can't remove IEnumerable<T> elements, but you can use the Enumerable.Skip Method

Answer 2

You can't. IEnumerable<T> can only be iterated.

In your second example, you can remove from original collection by iterating over a copy of it

foreach(var u in users.ToArray()) // ToArray creates a copy
{
   if(u.userId != 1233)
   {
        users.Remove(u);
   }
}

Answer 3

Not removing but creating a new List without that element with LINQ:

// remove
users = users.Where(u => u.userId != 123).ToList();

// new list
var modified = users.Where(u => u.userId == 123).ToList();