how can I remove the duplicate value next to each other using linq

Question

I have a list and I want to remove the duplicate value next to each other

var idList = new List<int>(){100,100,200,200,300,300,100,100,200,200,300,300}

and this is my expected result

[100,200,300,100,200,300]

How can i achieve this in linq

Answer 1

Try one of solutions:

var result = idList
        .Take( 1 )
        .Concat( idList
                    .Skip( 1 )
                    .Zip( idList, ( a, b ) => new { a, b } )
                    .Where( p => p.a != p.b )
                    .Select( p => p.a ) )
        .ToList( );