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Apparently this used to be a way in VB6 and VBA to short circuit and execute the first true case:
Select Case True
End Select
Is this still in use (VB.NET) ?
941
A Select Case statement allows a variable to be tested for equality against a list of values. Each value is called a case, and the variable being switched on is checked for each select case.
The Select Case VBA statement compares an expression with multiple Case statements containing conditions. If a match is found in any of the Case statements, the condition is said to be true. Further, if a condition is true, its corresponding code is executed and no more Case statements are tested.
Select Case is useful when you have three or more conditions that you want to check. You can also use this with two conditions (but I feel If Then Else is easier to use in those cases).
This syntax is often used instead of an If...ElseIf statement. Some people find it a little easier to read. For example:
Select Case True
Case testVariable < 0
Console.Write("You must supply a positive value.")
Case testVariable > 10
Console.Write("Please enter a number from 0-10.")
Case True
Call DoWork(testVariable)
End Select
The answer is that yes, this still works in VB.NET. Just take care with when you use it, because it's not a "standard programming construct" and may be unfamiliar to people that have to maintain your code in the future.
82
I'm not sure how this construct offers any advantages over the following:
If testVariable < 0 Then
Console.Write("You must supply a positive value.")
ElseIf testVariable > 10 Then
Console.Write("Please enter a number less than 10.")
Else
Call DoWork(testVariable)
End If
The above structure is short-circuiting, and I don't have to try to work out what it does as it's a standard construct.
44
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