VB.Net’s Nothing
keyword is is not the same as C#’s null
. MSDN states, “Assigning Nothing to a variable sets it to the default value for its declared type. If that type contains variable members, they are all set to their default value”.
In other words, the Nothing
keyword is actually equivalent to C#’s default(T)
keyword, where T
is the type that the expression is used as.
This can lead to nasty surprises with nullable types in conditional operators.
In C#, the expression (...) ? null : 1
will not compile, since “there is no implicit conversion between '<null>' and 'int'”. Since null
is an untyped expression, the type of the conditional is inferred to be int
, resulting in an error because null
cannot be converted to int
.
In VB.Net, by contrast, the equivalent expression, If((...), Nothing, 1)
, will compile, but will have unexpected results. Here too, Nothing
is an untyped expression, so the type of the conditional is inferred to be Integer
. However, unlike null
, Nothing
can be converted to Integer
, so this is compiled as If((...), 0, 1)
, which is probably not what the programmer intended.
In both languages, the solution is to use an expression which is actually typed as int?
, by writing new int?()
, (in C#) or New Integer?()
(in VB.Net).
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