{"id":2247,"date":"2012-04-26T09:38:41","date_gmt":"2012-04-26T13:38:41","guid":{"rendered":"http:\/\/jdhitsolutions.com\/blog\/?p=2247"},"modified":"2012-04-26T10:31:06","modified_gmt":"2012-04-26T14:31:06","slug":"powershell-scripting-with-validatecount","status":"publish","type":"post","link":"https:\/\/jdhitsolutions.com\/blog\/scripting\/2247\/powershell-scripting-with-validatecount\/","title":{"rendered":"PowerShell Scripting with [ValidateCount]"},"content":{"rendered":"

Here's another parameter validation attribute you might want to use in your PowerShell scripting and functions. If your parameter can take an array of values, you might want to limit that array to a certain size. For example, your parameter can take an array of computer names but you don't want to process more than 5 for some reason. This is where [ValidateCount()] comes in to play. <\/p>\n

This attribute takes two values, the minimum number of accepted parameter values and the maximum.<\/p>\n


\n[ValidateCount(1,10)]
\n[string[]]$Computername
\n<\/code><\/p>\n

If used, this would mean I would need at least one computername but no more than 10. You could also set both values the same if you wanted an exact number:<\/p>\n


\n[ValidateCount(2,2)]
\n[int[]]$Numbers
\n<\/code><\/p>\n

Now, I'd have to pass exactly 2 numbers as parameter values. Let's look at a more complete example.<\/p>\n


\n#requires -version 2.0<\/p>\n

Param (
\n[Parameter(Position=0,Mandatory=$True)]
\n[ValidateCount(1,5)]
\n[string[]]$Name
\n)<\/p>\n

Foreach ($item in $name) {<\/p>\n

#display the name in a random color
\n Write-Host $item -ForegroundColor ([system.consoleColor]::GetValues(\"system.consolecolor\") | get-random)<\/p>\n

}
\n<\/code><\/p>\n

This simple script writes each name in a random color, assuming I pass no more than 5 names.<\/p>\n

\"\"<\/a><\/p>\n

If I exceed that count, PowerShell will throw a tantrum (I mean exception).<\/p>\n

\"\"<\/a><\/p>\n

When you use this validation test, be sure your parameter is set to accept an array of values, e.g. [string[]]. If you'd like to try out my sample code feel free to download Demo-ValidateCount<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"

Here’s another parameter validation attribute you might want to use in your PowerShell scripting and functions. If your parameter can take an array of values, you might want to limit that array to a certain size. For example, your parameter can take an array of computer names but you don’t want to process more than…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[75,8],"tags":[307,534,540,372],"class_list":["post-2247","post","type-post","status-publish","format-standard","hentry","category-powershell-v2-0","category-scripting","tag-parameter","tag-powershell","tag-scripting","tag-validation"],"yoast_head":"\nPowerShell Scripting with [ValidateCount] • The Lonely Administrator<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jdhitsolutions.com\/blog\/scripting\/2247\/powershell-scripting-with-validatecount\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"PowerShell Scripting with [ValidateCount] • The Lonely Administrator\" \/>\n<meta property=\"og:description\" content=\"Here's another parameter validation attribute you might want to use in your PowerShell scripting and functions. If your parameter can take an array of values, you might want to limit that array to a certain size. 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[ValidateNotNullorEmpty]","author":"Jeffery Hicks","date":"May 15, 2012","format":false,"excerpt":"I've been writing about the different parameter validation attributes that you can use in your PowerShell scripting. One that I use in practically every script is [ValidateNotNullorEmpty()]. This validation will ensure that something is passed as a parameter value. I'm not talking about making a parameter mandatory; only that if\u2026","rel":"","context":"In "PowerShell v2.0"","block_context":{"text":"PowerShell v2.0","link":"https:\/\/jdhitsolutions.com\/blog\/category\/powershell-v2-0\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/jdhitsolutions.com\/blog\/wp-content\/uploads\/2012\/05\/validatenotnullorempty-300x141.png?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":2188,"url":"https:\/\/jdhitsolutions.com\/blog\/powershell\/2188\/powershell-scripting-with-validaterange\/","url_meta":{"origin":2247,"position":1},"title":"PowerShell Scripting with [ValidateRange]","author":"Jeffery Hicks","date":"April 11, 2012","format":false,"excerpt":"After my post yesterday on using the ValidateScript attribute with PSCredentials, I thought you might find it helpful to have a brief discussion on some other parameter validation attributes such as [ValidateRange()]. You can use this attribute if you want to verify that a given parameter value falls between some\u2026","rel":"","context":"In "PowerShell"","block_context":{"text":"PowerShell","link":"https:\/\/jdhitsolutions.com\/blog\/category\/powershell\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":2206,"url":"https:\/\/jdhitsolutions.com\/blog\/powershell\/2206\/powershell-scripting-with-validateset\/","url_meta":{"origin":2247,"position":2},"title":"PowerShell Scripting with [ValidateSet]","author":"Jeffery Hicks","date":"April 16, 2012","format":false,"excerpt":"Today we'll continue our exploration of the parameter validation attributes you can use in you PowerShell scripting. We've already looked at [ValidateRange] and [ValidateScript]. Another attribute you are likely to use is [ValidateSet()]. You can use this to verify that the parameter value belongs to a pre-defined set. To use,\u2026","rel":"","context":"In "PowerShell"","block_context":{"text":"PowerShell","link":"https:\/\/jdhitsolutions.com\/blog\/category\/powershell\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":2219,"url":"https:\/\/jdhitsolutions.com\/blog\/powershell\/2219\/powershell-scripting-with-validatelength\/","url_meta":{"origin":2247,"position":3},"title":"PowerShell Scripting with [ValidateLength]","author":"Jeffery Hicks","date":"April 20, 2012","format":false,"excerpt":"In continuing the exploration of parameter validation attributes, today we'll look at [ValidateLength()]. You can use this attribute in your PowerShell scripting to validate that a parameter value is at least a certain length and no more and a certain length. In other words, it has to be just right.\u2026","rel":"","context":"In "PowerShell"","block_context":{"text":"PowerShell","link":"https:\/\/jdhitsolutions.com\/blog\/category\/powershell\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/jdhitsolutions.com\/blog\/wp-content\/uploads\/2012\/04\/thisbig.png?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":2193,"url":"https:\/\/jdhitsolutions.com\/blog\/powershell\/2193\/powershell-scripting-with-validatescript\/","url_meta":{"origin":2247,"position":4},"title":"PowerShell Scripting with [ValidateScript]","author":"Jeffery Hicks","date":"April 12, 2012","format":false,"excerpt":"The last few days we've been looking at parameter validation attributes you might use in a script of function. Yesterday I wrote about [ValidateRange] and demonstrated how you might use it. That attribute works fine for any values that can be evaluated as numbers. But dates are a different story.\u2026","rel":"","context":"In "PowerShell"","block_context":{"text":"PowerShell","link":"https:\/\/jdhitsolutions.com\/blog\/category\/powershell\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":2211,"url":"https:\/\/jdhitsolutions.com\/blog\/scripting\/2211\/powershell-scripting-with-validatepattern\/","url_meta":{"origin":2247,"position":5},"title":"PowerShell Scripting with [ValidatePattern]","author":"Jeffery Hicks","date":"April 19, 2012","format":false,"excerpt":"I've been writing about a number of parameters attributes you can include in your PowerShell scripting to validate parameter values. Today I want to cover using a regular expression pattern to validate a parameter value. 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