In C#, the out
keyword is used to pass an argument to a method by reference. This means that the method can modify the value of the argument, and those changes will be reflected in the calling code. Here's an example:
In the example above, the Divide
method takes three arguments: numerator
, denominator
, and result
. The result
argument is marked with the out
keyword, which means that the Divide
method can modify its value. When the method is called, the result
variable is passed by reference, so when the method divides numerator
by denominator
and assigns the result to result
, the result
variable in the main
method is updated with the new value.
On the other hand, the ref
keyword is also used to pass an argument to a method by reference. The main difference between out
and ref
is that ref
requires that the argument be initialized before it is passed to the method, whereas out
does not. Here's an example of the ref
keyword in action: