"If" statement - Order of validation of objects?

Question

Simple question about the order of an IF statement in C#.NET

if (Company !=null && Company.ID > 0)
{
}

Does C# work from left to right, and therefore make the check on Company.ID valid?

Thanks.

Answer 1

Essentially, yes.

The if statement expects a boolean operator within the parentheses to determine evaluation of the next statement.

Using the && operator, if the first boolean check Company !=null is false, it will statement returning false, and not execute the other (Company.ID > 0).

Also (for reference), using the || operator will return true after the first statement if it is true and not evaluate the second.

Answer 2

MSDN:

The conditional-AND operator (&&) performs a logical-AND of its bool operands, but only evaluates its second operand if necessary.

Answer 3

The && operator is a so-called short-circuit operator. It tests the statements from left to right and stops testing once one of the tests fails. If you want every test to be run, use the & operator.

More info can be found here