Пример #1
0
        private BoundExpression CompareWithConstant(BoundExpression input, BoundExpression boundConstant)
        {
            var systemObject = _factory.SpecialType(SpecialType.System_Object);

            if (boundConstant.ConstantValue == ConstantValue.Null)
            {
                if (input.Type.IsNonNullableValueType())
                {
                    var systemBoolean = _factory.SpecialType(SpecialType.System_Boolean);
                    return(RewriteNullableNullEquality(
                               syntax: _factory.Syntax,
                               kind: BinaryOperatorKind.NullableNullEqual,
                               loweredLeft: input,
                               loweredRight: boundConstant,
                               returnType: systemBoolean));
                }
                else
                {
                    return(_factory.ObjectEqual(_factory.Convert(systemObject, input), boundConstant));
                }
            }
            else if (input.Type.IsNullableType() && boundConstant.NullableNeverHasValue())
            {
                return(_factory.Not(MakeNullableHasValue(_factory.Syntax, input)));
            }
            else
            {
                return(_factory.StaticCall(
                           systemObject,
                           "Equals",
                           _factory.Convert(systemObject, boundConstant),
                           _factory.Convert(systemObject, input)
                           ));
            }
        }