What's the difference between [Out] and out in C#? [duplicate]

StackOverflow https://stackoverflow.com/questions/16835906

  •  30-05-2022
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Question

I've seen both when looking up P/Invoke definitions... sometimes [Out] is used, and sometimes out... I'm assuming they're the same.

Was it helpful?

Solution

They are the equivalent to each other when used in the context of P/Invoke - see OutAttribute.

You can apply the OutAttribute to value and reference types passed by reference to change In/Out behavior to Out-only behavior, which is equivalent to using the out keyword in C#.

OTHER TIPS

In addition to James answer, note that the out contextual keyword is used in two contexts:

  • As a parameter modifier in parameter lists

  • In generic type parameter declarations in interfaces and delegates

Source: http://msdn.microsoft.com/en-us/library/t3c3bfhx.aspx

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