C SharpDataTypes

C Sharp - Null Topics

Null Coalescing Operator

Uses the ?? operator

For example

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X ?? y

Means – if x is non-null, evaluate to x, otherwise Y

Null conditional operators

Aka Null conditional operators – aka short-circuiting
If A is null, then A?.x or a?[x] will be null
If A is not null, than a?.x and a?[x] will be the same as a.x and a[x]

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message.To.Add(new MailboxAddress(toName ?? _emailConfig.UserName
              , toEmailAddr ?? _emailConfig.UserName));

In this case, if toName is null, then use _mailConfig.UserName, if toEmailAddr is null then use _emailConfig.UserName