René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Error is wrong when value given for IValidateSetValuesGenerator is not in GetValidValues()","articleBody":"Steps to reproduce\r\n------------------\r\n\r\n```powershell\r\nclass ValidateSetTest : System.Management.Automation.IValidateSetValuesGenerator\r\n{\r\n    [string[]] GetValidValues()\r\n    {\r\n        return 'Hello', 'World'\r\n    }\r\n}\r\n\r\nfunction Test-ValidateSet\r\n{\r\n    [CmdletBinding()]\r\n    param (\r\n        [Parameter(Mandatory = $true)]\r\n        [ValidateSet([ValidateSetTest])]\r\n        [string[]]\r\n        $Item\r\n    )\r\n    $Item\r\n}\r\n\r\nTest-ValidateSet -Item 'Cheese'\r\n```\r\n\r\nExpected behavior\r\n-----------------\r\n```none\r\nTest-ValidateSet : Cannot validate argument on parameter 'Item'. The argument \"Cheese\" does not belong to the set\r\n\"Hello,World\" specified by the ValidateSet attribute. Supply an argument that is in the set and then try the command\r\nagain.\r\nAt line:1 char:24\r\n+ Test-ValidateSet -Item 'Cheese'\r\n+                        ~~~~~~~\r\n    + CategoryInfo          : InvalidData: (:) [Test-ValidateSet], ParameterBindingValidationException\r\n    + FullyQualifiedErrorId : ParameterArgumentValidationError,Test-ValidateSet\r\n```\r\n\r\nActual behavior\r\n---------------\r\n\r\n```none\r\nTest-ValidateSet : Cannot validate argument on parameter 'Item'. Value cannot be null.\r\nParameter name: value\r\nAt line:1 char:24\r\n+ Test-ValidateSet -Item 'Cheese'\r\n+                        ~~~~~~~~\r\n    + CategoryInfo          : InvalidData: (:) [Test-ValidateSet], ParameterBindingValidationException\r\n    + FullyQualifiedErrorId : ParameterArgumentValidationError,Test-ValidateSet\r\n```\r\n\r\nEnvironment data\r\n----------------\r\n\r\n\u003c!-- provide the output of $PSVersionTable --\u003e\r\n\r\n```powershell\r\nName                           Value\r\n----                           -----\r\nPSVersion                      6.0.0-beta\r\nPSEdition                      Core\r\nGitCommitId                    v6.0.0-beta.6\r\nOS                             Microsoft Windows 10.0.15063\r\nPlatform                       Win32NT\r\nPSCompatibleVersions           {1.0, 2.0, 3.0, 4.0...}\r\nPSRemotingProtocolVersion      2.3\r\nSerializationVersion           1.1.0.1\r\nWSManStackVersion              3.0\r\n```\r\n","author":{"url":"https://github.com/lfshr","@type":"Person","name":"lfshr"},"datePublished":"2017-08-29T14:12:31.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/4698/PowerShell/issues/4698"}