CODEWITHSUNDEEP
.netvb.netselect-case
user1570048
user1570048

Reputation: 880

Select Case True in VB.NET

I have the following select case where I want to do some checks on what a string contains and call some functions for each case. But it seems that if multiple conditions are true it considers only the first condition. The problem is I have about 113 different cases.

Do I have to use an if statement for each case?

   Select Case True
          Case command.ToUpper.Contains(" S:")
'Do something
          Case command.ToUpper.Contains(" C:")
'Do something
          Case command.ToUpper.Contains(" *S")
'Do something
          Case command.ToUpper.Contains(" *C")
'Do something
          Case command.ToUpper.Contains(" CC")
'Do something
          Case command.ToUpper.Contains(" SS")
    End Select

Upvotes: 1

Views: 1512

Answers (2)

John Roa
John Roa

Reputation: 61

Just a thought, but what about 

dim tempCommand as string = command.ToUpper()
dim match as boolean = true

while match andalso tempCommand.length > 0
    select case true
        Case tempCommand.Contains(" S:")
            'Do something
            'then do this    
            tempCommand = tempCommand.replace(" S:","")
        Case tempCommand.Contains(" C:")
            'Do something
            'then do this
            tempCommand = tempCommand.replace(" C:","")
        Case tempCommand.Contains(" *S")
            'Do something
            'then do this
            tempCommand = tempCommand.replace(" *S","")
        Case tempCommand.Contains(" *C")
            'Do something    
            'then do this
            tempCommand = tempCommand.replace(" *C","")
        Case tempCommand.Contains(" CC")
            'Do something
            'then do this
            tempCommand = tempCommand.replace(" CC","")
        Case command.ToUpper.Contains(" SS")
            'then do this
            tempCommand = tempCommand.replace(" SS","")    
        case else match = false
    end select
end while

I'm assuming that based on the various criteria you are performing different actions, so I'm not sure how you would do the "perform pattern.action" unless that is a way of doing code dynamically that I don't know about and would be totally cool if it can be done.

My suggestion does destroy the command, which is why I'm using a temporary holding variable so that the original command isn't lost, in case you need it further in the code.

Upvotes: 0

Chris
Chris

Reputation: 4231

That's how select case is defined. Using a sequence of If statements would work.

Consider a table-driven solution (Pseudocode):

For Each pat In patterns
  If command contains pattern.pat
    perform pattern.action

Upvotes: 4

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