WPF LINQ and the ObservableCollection

The OP asked especially for the LINQ ".ForEach()" Method, which cannot be used on ObservableCollection< T >, since it's implemented for List< T > only.

There is another SO-Topic, where I found my solution: https://stackoverflow.com/a/200584/2408978

What makes you think you can't use LINQ with ObservableCollection<T>? It implements Collection<T> so it should be fine.

For example:

using System;
using System.Collections.ObjectModel;
using System.Linq;

class Test
{
    static void Main()
    {
        var collection = new ObservableCollection<int>()
        {
            1, 2, 3, 6, 8, 2, 4, 5, 3
        };

        var query = collection.Where(x => x % 2 == 0);
        foreach (int x in query)
        {
            Console.WriteLine(x);
        }
    }
}

Just for anybody else who may come across this issue with trying to filter an ObservableCollection but find that they can't.

Jon is absolutely correct in that there is no reason why you can't do this but the key thing for a newbie or for someone who has been developing with WPF for a while, is that you need to include the "using System.Linq;" namespace. As you soon as you do this, you can do a ".where" query on your object.