Question

I’m sure that I’m missing something simple here, but in Visual Studio 2008 on my current project only List.Contains(T) is present. Being able to use List.Contains(T, IEqualityComparer(T)) would save me a lot of grief. Any quick thoughts on this? Thanks.

*edit:
using System.Linq is not available to me. Is is possible that my project is stuck in .net 2.0 or something along those lines? Anyway to check & fix?

Answer 1

Make sure to reference System.Linq and include it (using System.Linq) in your namespaces.

The second call you are referring to is actually Enumerable.Contains in System.Linq.

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Edit in response to comments:

You could make your own version:

public void ContainedInList(IEnumerable<T> list, T value, IEqualityComparer<T> comparer)
{
    foreach(T element in list)
    {
        if (comparer.Equals(element, value))
            return true;
    }
    return false;
}