Conditional and Logical Operators
Not Is performing logical negation on a Boolean expression,
or bitwise negation on a numeric expression. (For a Boolean negation,
the data type of the result is Boolean. For a bitwise negation, the
result data type is the same as that of expression but if expression is
Decimal, the result is Long.)
And Is performing a logical conjunction on two Boolean expressions, or a bitwise conjunction on two numeric expressions. (In a Boolean comparison, the And operator always evaluates both expressions)
AndAlso Is performing short-circuiting logical conjunction on two expressions (In a Boolean comparison, AndAlso performs short-circuiting, which means that if expression1 is False, then expression2 is not evaluated.)
Or Is performing a logical disjunction on two Boolean expressions, or a bitwise disjunction on two numeric expression (In a Boolean comparison, the Or operator always evaluates both expressions)
OrElse Is performing short-circuiting inclusive logical disjunction on two expressions (In a Boolean comparison, OrElse performs short-circuiting which means that if expression1 is True, then expression2 is not evaluated.)
Xor Is performing a logical exclusion on two Boolean expressions, or a bitwise exclusion on two numeric expressions. (In a Boolean comparison, the Xor operator always evaluates both expressions as there is no short-circuiting counterpart to Xor, because the result always depends on both operands.)
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| Dim IsUsernameValid As BooleanIsUsernameValid = Not (Username.Text = "admin") |
And Is performing a logical conjunction on two Boolean expressions, or a bitwise conjunction on two numeric expressions. (In a Boolean comparison, the And operator always evaluates both expressions)
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| Dim IsUserValid As BooleanIsUserValid = (Username.Text = "admin") And (Password.Text = "mypwd") |
AndAlso Is performing short-circuiting logical conjunction on two expressions (In a Boolean comparison, AndAlso performs short-circuiting, which means that if expression1 is False, then expression2 is not evaluated.)
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| Dim IsUserValid As BooleanIsUserValid = (Username.Text = "admin") AndAlso (Password.Text = "mypwd") |
Or Is performing a logical disjunction on two Boolean expressions, or a bitwise disjunction on two numeric expression (In a Boolean comparison, the Or operator always evaluates both expressions)
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| Dim IsPasswordValid As BooleanIsPasswordValid = (Password.Text = "mypass") Or (Password.Text = "mypwd") |
OrElse Is performing short-circuiting inclusive logical disjunction on two expressions (In a Boolean comparison, OrElse performs short-circuiting which means that if expression1 is True, then expression2 is not evaluated.)
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| Dim IsPasswordValid As BooleanIsPasswordValid = (Password.Text = "mypwd") OrElse (Password.Text = "mypass") |
Xor Is performing a logical exclusion on two Boolean expressions, or a bitwise exclusion on two numeric expressions. (In a Boolean comparison, the Xor operator always evaluates both expressions as there is no short-circuiting counterpart to Xor, because the result always depends on both operands.)
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| Dim IsUsernameValid As BooleanIsUsernameValid = (Username.Text = "admin") Xor (Username.Text = "user") |
