Is there a conditional ternary operator in VB NET

Question

In Perl  and other languages  a conditional ternary operator can be expressed like this   my  foo    bar     buz    cat    dog    Is there a similar operator in VB NET

User · Answer

Just for the record  here is the difference between If and IIf  IIf condition  true-part  false-part    This is the old VB6 VBA Function The function always returns an Object type  so if you want to use the methods or properties of the chosen object  you have to re-cast it with DirectCast or CType or the Convert   Functions to its original type Because of this  if true-part and false-part are of different types there is no matter  the result is just an object anyway  If condition  true-part  false-part    This is the new VB NET Function The result type is the type of the chosen part  true-part or false-part This doesn t work  if Strict Mode is switched on and the two parts are of different types  In Strict Mode they have to be of the same type  otherwise you will get an Exception If you really need to have two parts of different types  switch off Strict Mode  or use IIf  I didn t try so far if Strict Mode allows objects of different type but inherited from the same base or implementing the same Interface  The Microsoft documentation isn t quite helpful about this issue  Maybe somebody here knows it

User · Answer

Depends upon the version   The If operator in VB NET 2008 is a ternary operator  as well as a null coalescence operator    This was just introduced  prior to 2008 this was not available   Here s some more info   Visual Basic If announcement  Example   Dim foo as String   If bar   buz  cat  dog     EDIT   Prior to 2008 it was IIf  which worked almost identically to the If operator described Above   Example   Dim foo as String   IIf bar   buz  cat  dog

User · Answer

If   is the closest equivalent but beware of implicit conversions going on if you have set  quot Option Strict off quot  For example  if your not careful you may be tempted to try something like  Dim foo As Integer    If someTrueExpression  Nothing  2   Will give  quot foo quot  a value of 0  I think the     operator equivalent in C  would instead fail compilation

User · Answer

iif has always been available in VB  even in VB6   Dim foo as String   iif bar   buz  cat  dog    It is not a true operator  as such  but a function in the Microsoft VisualBasic namespace

[vb.net] Is there a conditional ternary operator in VB.NET?

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