7.9 Relational and type-testing operators

C# Language Specification

The ==, !=, <, >, <=, >=, is and as operators are called the relational and type-testing operators.

relational-expression:: shift-expression
relational-expression   <   shift-expression
relational-expression   >   shift-expression
relational-expression   <=   shift-expression
relational-expression   >=   shift-expression
relational-expression   is   type
relational-expression   as   type
equality-expression:: relational-expression
equality-expression == relational-expression
equality-expression != relational-expression

The is operator is described in Section 7.9.9 and the as operator is described in Section 7.9.10.

The ==, !=, <, >, <= and >= operators are comparison operators. For an operation of the form x op y, where op is a comparison operator, overload resolution (Section 7.2.4) is applied to select a specific operator implementation. The operands are converted to the parameter types of the selected operator, and the type of the result is the return type of the operator.

The predefined comparison operators are described in the following sections. All predefined comparison operators return a result of type bool, as described in the following table.

Operation	Result
x == y	`true` if `x` is equal to `y`, `false` otherwise
x != y	`true` if `x` is not equal to `y`, `false` otherwise
x < y	`true` if `x` is less than `y`, `false` otherwise
x > y	`true` if `x` is greater than `y`, `false` otherwise
x <= y	`true` if `x` is less than or equal to `y`, `false` otherwise
x >= y	`true` if `x` is greater than or equal to `y`, `false` otherwise