print barcode labels c# Introduction to Windows PowerShell Scripting in Visual C#

Creator Quick Response Code in Visual C# Introduction to Windows PowerShell Scripting

Introduction to Windows PowerShell Scripting
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Evaluating Multiple Conditions
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The Windows PowerShell demoIfElseIfElse .ps1 script is a bit easier to understand because it avoids the double End If kind of scenario . For each condition that you want to evaluate, you use elseif. Be aware that this is a single word . You put the condition inside a pair of smooth parentheses, and open your script block . The demoIfElseIfElse .ps1 script demonstrates this .
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demoIfElseIfElse.ps1 $a = 4 If ($a -eq 5) { '$a equals 5' } ElseIf ($a -eq 3) { '$a is equal to 3' } Else { '$a does not equal 3 or 5' }
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The switch Statement
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As a best practice, you generally avoid using the elseif type of construction from either VBScript or Windows PowerShell, because there is a better way to write the same code . In VBScript, you use the Select Case statement to evaluate a condition and select one outcome from a group of potential statements . In the DemoSelectCase .VBS script, the value of the variable a is assigned the value of 2 . The Select Case statement is used to evaluate the value of the variable a. The syntax is seen here .
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Select Case testexpression
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The test expression that is evaluated is the variable a. Each of the different cases contains potential values for the test expression . If the value of the variable a is equal to 1, the code Wscript .Echo "a = 1" is executed as seen here .
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Case 1 WScript.Echo "a = 1"
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Each of the different cases is evaluated in the same manner . The Case Else expression is run if none of the previous expressions evaluate to true . The complete DemoSelectCase .vbs script is seen here .
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DemoSelectCase.vbs a = 2 Select Case a Case 1 WScript.Echo "a = 1" Case 2 WScript.Echo "a = 2" Case 3 WScript.Echo "a = 3" Case Else WScript.Echo "unable to determine value of a" End Select WScript.Echo "statement after select case"
Using the switch Statement
In Windows PowerShell, there is no Select Case statement . There is, however, the switch statement . The switch statement is the most powerful statement in the Windows PowerShell language . The switch statement begins with the switch keyword, and the condition to be evaluated is inside a pair of smooth parentheses, as seen here:
Switch ($a)
Next, a pair of braces (curly brackets) is used to mark off the script block for the switch statement . Inside the script block, each condition to be evaluated begins with a value followed by the script block to be executed in the event the value matches the condition, as shown here .
1 { '$a = 1' } 2 { '$a = 2' } 3 { '$a = 3' }
DEFINING THE DEFAULT CONDITION
If no match is found and the default statement is not used, the switch statement exits, and the line of code that follows the switch statement is executed . The default statement performs a function similar to the one performed by the Case Else statement from the Select Case statement . The default statement is seen here .
Default { 'unable to determine value of $a' }
The complete DemoSwitchCase .ps1 script is seen here .
Introduction to Windows PowerShell Scripting
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DemoSwitchCase.ps1 $a = 2 Switch ($a) { 1 { '$a = 1' } 2 { '$a = 2' } 3 { '$a = 3' } Default { 'unable to determine value of $a' } } "Statement after switch"
UNDERSTaNDING MaTCHING
With the Select Case statement, the first matching case is the one that is executed . As soon as that code executes, the line following the Select Case statement is executed . If the condition matches multiple cases in the Select Case statement, only the first match in the list is executed . Matches from lower in the list are not executed . Therefore, make sure that the most desirable code to execute is positioned highest in the Select Case order . With the switch statement in Windows PowerShell, order is not a major design concern because every match from inside the switch statement will be executed . An example of this is seen in the DemoSwitchMultiMatch .ps1 script shown here .
DemoSwitchMultiMatch.ps1 $a = 2 Switch ($a) { 1 { '$a = 1' } 2 { '$a = 2' } 2 { 'Second match of the $a variable' } 3 { '$a = 3' } Default { 'unable to determine value of $a' } } "Statement after switch"
When the DemoSwitchMultiMatch .ps1 script runs, the second and third conditions will both be matched, and therefore their associated script blocks are executed . The DemoSwitchMultiMatch .ps1 script produces the output seen here .
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