VB NET If statement with Or conditional has both sides evaluated

Question

Quick question  of which the quickest and easiest answer may well be to rearrange related code  but let s see     So I have an If statement  a piece of code which is a part of a full working solution written in C   rewritten using VB NET  I am aware the VB NET IIf a  b  c  method evaluates both b and a regardless of the trueness of the first evaluation  but this seems to be the case in my standard construct  too   If  example Is Nothing Or example Item IsNot compare Item  Then      Proceed End If   Or  rather  more appropriately   If  example Is Nothing Or Not example Item   compare Item  Then      Proceed End If   Here  if example is Nothing  null  then I still get an NullReferenceException - is this my fault  or is it something I just have to endure at the whim of VB NET

User · Answer

OrElse is the short-circuited equivalent of Or

User · Answer

It s your  fault  in that that s how Or is defined  so it s the behaviour you should expect      In a Boolean comparison  the Or operator always evaluates both expressions  which could include making procedure calls  The OrElse Operator  Visual Basic  performs short-circuiting  which means that if expression1 is True  then expression2 is not evaluated    But you don t have to endure it  You can use OrElse to get short-circuiting behaviour   So you probably want   If  example Is Nothing OrElse Not example Item   compare Item  Then      Proceed End If   I can t say it reads terribly nicely  but it should work

[.net] VB.NET 'If' statement with 'Or' conditional has both sides evaluated?

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