Dictionary comparer, great for grouping dictionaries with LINQ. GetHashCode implementation could use work.

dictionaryComparer.cs

public class KeyEqualityComparer<T, U> : IEqualityComparer<KeyValuePair<T, U>>
{
    public bool Equals(KeyValuePair<T, U> x, KeyValuePair<T, U> y)
    {
        return (x.Key.Equals(y.Key) && x.Value.Equals(y.Value));
    }

    public int GetHashCode(KeyValuePair<T, U> obj)
    {
        return obj.Key.GetHashCode();
    }
}

public class DictionaryComparer<T, U> : IEqualityComparer<IDictionary<T, U>>
{
    public bool Equals(IDictionary<T, U> a, IDictionary<T, U> b)
    {
        var result = a.SequenceEqual(b, new KeyEqualityComparer<T, U>());
        return result;
    }
    
    public int GetHashCode(IDictionary<T, U> d)
    {
        return d.Aggregate("", (a,b) => b.Key.ToString()).GetHashCode();
    }
}