Lambda Equality Comparer

LambdaEqualityComparer.cs

public class EqualityComparerFactory
{
	private sealed class Impl<T> : IEqualityComparer<T>
	{
		private readonly Func<T, T, bool> Eq;
		private readonly Func<T, int> HashFunc;
		public Impl(Func<T, T, bool> eq, Func<T, int> hashFunc)
		{
			Eq = eq;
			HashFunc = hashFunc;
		}
		public bool Equals(T left, T right)
		{
			return Eq(left, right);
		}
		public int GetHashCode(T obj)
		{
			return HashFunc(obj);
		}

	}
	public static IEqualityComparer<T> Create<T>(Func<T, T, bool> eq, Func<T, int> hashFunc )
	{
		return new Impl<T>(eq, hashFunc);
	}
}

var comparer = EqualityComparerFactory.Create<TileTagModel>((a,b) => a.Name == b.Name && a.IsDefault == b.IsDefault, model => model.Name.GetHashCode() + model.IsDefault.GetHashCode());
Assert.That(tags, Is.EquivalentTo(expected).Using(comparer));