System.Linq.Expressions.Expression.GetEqualityComparisonOperator C# (CSharp) Method

        private static BinaryExpression GetEqualityComparisonOperator(ExpressionType binaryType, string opName, Expression left, Expression right, bool liftToNull)
        {
            // known comparison - numeric types, bools, object, enums
            if (left.Type == right.Type && (left.Type.IsNumeric() ||
                left.Type == typeof(object) ||
                left.Type.IsBool() ||
                left.Type.GetNonNullableType().GetTypeInfo().IsEnum))
            {
                if (left.Type.IsNullableType() && liftToNull)
                {
                    return new SimpleBinaryExpression(binaryType, left, right, typeof(bool?));
                }
                else
                {
                    return new LogicalBinaryExpression(binaryType, left, right);
                }
            }
            // look for user defined operator
            BinaryExpression b = GetUserDefinedBinaryOperator(binaryType, opName, left, right, liftToNull);
            if (b != null)
            {
                return b;
            }
            if (TypeUtils.HasBuiltInEqualityOperator(left.Type, right.Type) || IsNullComparison(left, right))
            {
                if (left.Type.IsNullableType() && liftToNull)
                {
                    return new SimpleBinaryExpression(binaryType, left, right, typeof(bool?));
                }
                else
                {
                    return new LogicalBinaryExpression(binaryType, left, right);
                }
            }
            throw Error.BinaryOperatorNotDefined(binaryType, left.Type, right.Type);
        }