Unique list of items using LINQ

Question

I\'ve been using LINQ for a while now, but seem to be stuck on something with regards to Unique items, I have the folling list:

List stock = new Lis         


        

Answer 1

static class EnumerableEx
{
    // Selectively skip some elements from the input sequence based on their key uniqueness.
    // If several elements share the same key value, skip all but the 1-st one.
    public static IEnumerable uniqueBy( this IEnumerable src, Func keySelecta )
    {
        HashSet res = new HashSet();
        foreach( tSource e in src )
        {
            tKey k = keySelecta( e );
            if( res.Contains( k ) )
                continue;
            res.Add( k );
            yield return e;
        }
    }
}

// Then later in the code
List res = src.uniqueBy( elt => elt.Type ).ToList()