when to use ref and out in c#

Sometimes when you pass a parameter to a method, you'd like changes made to the parameter within the method to be persisted when the method returns.

This is what ref and out parameters do.

The difference between them is that out parameters do not need to be initialized before being passed to the method but you are guaranteed that they will be assigned a value before the method returns. They are therefore useful when you want to return more than one value from a method.

In contrast ref parameters do need to be initialized before being passed to the method and may or may not be assigned a different value within the method itself.

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Kalai12y ago
Thanks for your reply.
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Vulpes12y ago
Sometimes when you pass a parameter to a method, you'd like changes made to the parameter within the method to be persisted when the method returns.

This is what ref and out parameters do.

The difference between them is that out parameters do not need to be initialized before being passed to the method but you are guaranteed that they will be assigned a value before the method returns. They are therefore useful when you want to return more than one value from a method.

In contrast ref parameters do need to be initialized before being passed to the method and may or may not be assigned a different value within the method itself.
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