Question

I have this IEnumerable:

var collection = from obj in list
                        select new
                        {
                            Title = (string)obj.Element("title"),
                            otherAtt = (string)obj.Element("otherAtt"),
                            ..
                            ..
                            ..
                            ..
                        };

And I want to remove all the objects in ‘collection’ that has duplicate Title. And to leave the last that had a duplicates.

For example:

collection = {
    {Title="aaa" ,otherAtt="1" ,....},
    {Title="bbb" ,otherAtt="2" ,....},
    {Title="aaa" ,otherAtt="3" ,....},
    {Title="aaa" ,otherAtt="4" ,....},
    {Title="ccc" ,otherAtt="5" ,....},
    {Title="bbb" ,otherAtt="6" ,....}
}

And I need that the filter will cause the collection to look like that:

collection = {
    {Title="aaa" ,otherAtt="4" ,....},
    {Title="ccc" ,otherAtt="5" ,....},
    {Title="bbb" ,otherAtt="6" ,....}
}

Thanks.

Answer 1

You can use the Distinct() extension method, but you will have to write an IEqualityComparer so that Title is used for the comparison.

I think this is pretty close to what you need: http://forums.asp.net/post/2276937.aspx