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Oct
24
Written by:
cadams
10/24/2007 10:12 AM
Power-Tip of The Day: #1
Making a Cmdlet that uses parameters? Do you need to just have a parameter flag verified? But you don't need to pass anything to the Cmdlet to use as input?
When defining your Parameters I recommend you looks the forlorn and lonely SwitchParameter struct. It will suit your needs just perfectly. For example:
[Parameter (
Position = 0,
Mandatory = false,
ValueFromPipeline = false,
ValueFromPipelineByPropertyName = false,
HelpMessage = "This operand informs the cmdlet to return a random value from the internal resource." )]
[Alias ( "Random", "rand", "r" )]
public SwitchParameter RandomOperand
{
get { return spRand; }
set { spRand = value; }
}
private SwitchParameter spRand;
This can then be used somewhere within your Process loop you can setup an If-Else block that checks the various operands. I need to come up with a set of good functions for parsing and handling parameters in the form of some good boilerplate code. Something I can reuse for my other Cmdlets. Come to think of it others could probably benefit from this kind of thing as well. Hmmm...
There is one thing I want to mention as a caveat; it's probably a simple thing for others to spot. When defining the public SwitchParameter, do not use reserved words. Like gee... the "Random" class within the framework, hence why I renamed the SwitchParameter: "RandomOperand". The code will compile, however when the Cmdlet is invoked it'll give an error message and spiral off into gibbering lunacy and confusion; the poor Cmdlet will die shortly after. The poor thing, it was so horrible to watch this fledgling Cmdlet suffer. So let this be a lesson! To you so; A) you know how to properly setup a parameter flag, B) treat your Cmdlet's humanely. To me; A) don't overlook obvious things like that in the future, B) don't write code at 6:30am on a Monday, it leads to Cmdlet abuse.
Here at The Corner, we pride ourselves on putting the Amateur into 'The Amateur Boffin's Corner!' Code safe kids! Don't be inhumane to your precious little Cmdlets.
2 comment(s) so far...
Re: Power-Tip of The Day: #1
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