Assigning the Output of a SWITCH Statement

re: Assigning the Output of a SWITCH Statement

Smith Catar — Fri, 17 Jul 2009 19:20:13 GMT

I forgot to say...

I don't want to execute ps1 script with double-click,

but I do want to execute ps1 script with only its name in a batch file or cmd.exe

So I hoped easy way to do it as a standard feature of win7 or posh v2.

re: Assigning the Output of a SWITCH Statement

Smith Catar — Sun, 05 Jul 2009 17:37:46 GMT

Hi Jeffrey, I have a question.

When I set powershell.exe as a default program for .ps1 file types in Windows 7,

are there ways that do it easy and correctly?

(like 'powershell.exe -File "%1"', not 'powershell.exe "%1"')

re: Assigning the Output of a SWITCH Statement

Oisin Grehan — Wed, 01 Jul 2009 21:23:38 GMT

Hey Jeffrey - you might want to mention that your example only works with later v2 powershell versions (post ctp3) that allow statements on the RHS. For v1.0, you need:

$foo = $( switch(...) { ... } )

e.g. a subexpression wrapping the switch.

-Oisin

re: Assigning the Output of a SWITCH Statement

PowerShell Team — Wed, 01 Jul 2009 15:36:38 GMT

Excellent question Philip!

I thought about addressing this in the blog but then thought it would screw up the signal-to-noise ratio so I punted on it. The problem is that the original code didn't have a "default" case on the switch so I don't know what they wanted to have happen. In the case of the hash table, you use the ContainsKey() method on the hash table:

if (!($map.ContainsKey($global:template))) {...}

Thanks for asking!

jps

re: Assigning the Output of a SWITCH Statement

Philip Colmer — Wed, 01 Jul 2009 12:45:18 GMT

I, for one, didn't know the trick with the hashtable and the map function. Nice! Definitely simplifies the switch statement (actually eliminates it)!

What happens, though, if there isn't a match?