Expression<Func<ReferencedEntity, bool>> expected = (ReferencedEntity referencedEntity) => foreignKeys.Contains(referencedEntity.Id);
Expression<Func<ReferencedEntity, bool>> actual;

ParameterExpression entityParameter = Expression.Parameter(typeof(TReferencedEntity), "referencedEntity");
MemberExpression memberExpression = Expression.Property(entityParameter, "Id");
Expression convertExpression = Expression.Convert(memberExpression, typeof(object)); //This is becuase the memberExpression for Id returns a int.

//Expression containsExpression = Expression.Call(????

//actual = Expression.Lambda<Func<TReferencedEntity, bool>>(????, entityParameter);

/// <summary>
	///
	/// </summary>
	/// <param name="foreignKeys"></param>
	/// <returns></returns>
	private Expression<Func<TReferencedEntity, bool>> BuildForeignKeysContainsPredicate(List<object> foreignKeys, string primaryKey)
	{
		Expression<Func<TReferencedEntity, bool>> result = default(Expression<Func<TReferencedEntity, bool>>);

		try
		{
			ParameterExpression entityParameter = Expression.Parameter(typeof(TReferencedEntity), "referencedEntity");
			ConstantExpression foreignKeysParameter = Expression.Constant(foreignKeys, typeof(List<object>));
			MemberExpression memberExpression = Expression.Property(entityParameter, primaryKey);
			Expression convertExpression = Expression.Convert(memberExpression, typeof(object));
			MethodCallExpression containsExpression = Expression.Call(foreignKeysParameter
				, "Contains", new Type[] { }, convertExpression);

			result = Expression.Lambda<Func<TReferencedEntity, bool>>(containsExpression, entityParameter);

		}
		catch (Exception ex)
		{
			throw ex;
		}

		return result;
	}