VB NET Switch Statement GoTo Case

Question

I am writing some code in VB NET that uses a switch statement but in one of the cases it needs to jump to another block  In C  it would look like this   switch  parameter        case  userID              does something here      case  packageID              does something here      case  mvrType           if  otherFactor                           does something here                    else                       goto default                default             does some processing            break      However  I don t know how to convert this to VB NET  I tried this   Select Case parameter      Case  userID            does something here      Case  packageID            does something here      Case  mvrType           If otherFactor Then                does something here           Else              GoTo Case Else          End If      Case Else            does some processing             Exit Select  End Select        But when I do this I get a compiler error   Identifier expected   There sa squiggly line under  Case   Any ideas    Also  is it wrong to use a GoTo statement in this case  It seems any other way I would have to re-write it     I have changed my code to as follows   If otherFactor AndAlso parameter    mvrType  Then       does something here  Else        My original  Select Case statement  here without the case for  mvrType   End If

User · Answer

Select Case parameter       does something here        does something here      Case  userID    packageID    mvrType                    does something here          If otherFactor Then         Else             goto case default         End If     Case Else           does some processing            Exit Select End Select

User · Answer

Select Case parameter      Case  userID            does something here      Case  packageID            does something here      Case  mvrType           If otherFactor Then                does something here          End If      Case Else            does some processing             Exit Select  End Select   Is there a reason for the goto  If it doesn t meet the if criterion  it will simply not perform the function and go to the next case

User · Answer

Why not just do it like this   Select Case parameter         Case  userID                          does something here             Case  packageID                          does something here             Case  mvrType                         If otherFactor Then                                     does something here                         Else                                     do processing originally part of GoTo here          Exit Select         End If       End Select   I m not sure if not having a case else at the end is a big deal or not  but it seems like you don t really need the go to if you just put it in the else statement of your if

User · Answer

you should declare label first use this        Select Case parameter          Case  userID                        does something here              Case  packageID                        does something here              Case  mvrType                       If otherFactor Then                                does something here                       Else                              GoTo else                     End If               Case Else  else                         does some processing                         Exit Select      End Select

User · Answer

Why don t you just refactor the default case as a method and call it from both places  This should be more readable and will allow you to change the code later in a more efficient manner

User · Answer

Select Case parameter        does something here         does something here       Case  userID    packageID    mvrType           If otherFactor Then                does something here           Else              goto case default          End If      Case Else            does some processing             Exit Select  End Select

User · Answer

There is no equivalent in VB NET that I could find   For this piece of code you are probably going to want to open it in Reflector and change the output type to VB to get the exact copy of the code that you need   For instance when I put the following in to Reflector   switch  args 0         case  UserID           Console Write  UserID            break      case  PackageID           Console Write  PackageID            break      case  MVRType           if  args 1      None               Console Write  None            else             goto default          break      default          Console Write  Default            break      it gave me the following VB NET output   Dim CS 4 0000 As String   args 0  If  Not CS 4 0000 Is Nothing  Then     If  CS 4 0000    UserID   Then         Console Write  UserID           Return     End If     If  CS 4 0000    PackageID   Then         Console Write  PackageID           Return     End If     If   CS 4 0000    MVRType   AndAlso  args 1     None    Then         Console Write  None           Return     End If End If Console Write  Default     As you can see you can accomplish the same switch case statement with If statements   Usually I don t recommend this because it makes it harder to understand  but VB NET doesn t seem to support the same functionality  and using Reflector might be the best way to get the code you need to get it working with out a lot of pain   Update   Just confirmed you cannot do the exact same thing in VB NET  but it does support some other useful things   Looks like the IF statement conversion is your best bet  or maybe some refactoring   Here is the definition for Select   Case  http   msdn microsoft com en-us library cy37t14y aspx

User · Answer

I m not sure it s a good idea to use a GoTo but if you do want to use it  you can do something like this   Select Case parameter      Case  userID            does something here      Case  packageID            does something here      Case  mvrType           If otherFactor Then                does something here           Else              GoTo caseElse         End If      Case Else caseElse            does some processing     End Select   As I said  although it works  GoTo is not good practice  so here are some alternative solutions   Using elseif     If parameter    userID  Then       does something here  ElseIf parameter    packageID  Then       does something here  ElseIf parameter    mvrType  AndAlso otherFactor Then       does something here  Else      does some processing    End If   Using a boolean value     Dim doSomething As Boolean  Select Case parameter Case  userID         does something here  Case  packageID         does something here  Case  mvrType       If otherFactor Then             does something here        Else           doSomething   True      End If Case Else      doSomething   True End Select  If doSomething Then        does some processing     End If   Instead of setting a boolean variable you could also call a method directly in both cases

User · Answer

In VB NET  you can apply multiple conditions even if the other conditions don t apply to the Select parameter  See below   Select Case parameter      Case  userID                    does something here          Case  packageID                    does something here          Case  mvrType  And otherFactor                   does something here           Case Else                    does some processing     End Select

[vb.net] VB.NET Switch Statement GoTo Case

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