Question

这＆＃34;规则＆＃34;在PowerShell文档中说明，例如here。但是，我不确定我是否正确地解释了它。以下似乎对我很好。

function Test-ParameterSets
{
    param(
    [Parameter(Position = 0, ParameterSetName = "NameName")] 
    [Parameter(Position = 0, ParameterSetName = "NameId")] 
    [string] $A_by_Name, 

    [Parameter(Position = 0, ParameterSetName = "IdName")] 
    [Parameter(Position = 0, ParameterSetName = "IdId")] 
    [int] $A_by_Id,

    [Parameter(Position = 1, ParameterSetName = "NameName")] 
    [Parameter(Position = 1, ParameterSetName = "IdName")] 
    [string] $B_by_Name,

    [Parameter(Position = 1, ParameterSetName = "NameId")] 
    [Parameter(Position = 1, ParameterSetName = "IdId")] 
    [int] $B_by_Id
    )

    write-host "Hello"
}

我误解了吗？或者规则是否过时了？

Answer 1

你还没有充分展示自己的榜样：

function Test-ParameterSets
{
    param(
    [Parameter(Position = 0, ParameterSetName = "NameName")] 
    [Parameter(Position = 0, ParameterSetName = "NameId")] 
    [string] $A_by_Name, 

    [Parameter(Position = 0, ParameterSetName = "IdName")] 
    [Parameter(Position = 0, ParameterSetName = "IdId")] 
    [int] $A_by_Id,

    [Parameter(Position = 1, ParameterSetName = "NameName")] 
    [Parameter(Position = 1, ParameterSetName = "IdName")] 
    [string] $B_by_Name,

    [Parameter(Position = 1, ParameterSetName = "NameId")] 
    [Parameter(Position = 1, ParameterSetName = "IdId")] 
    [int] $B_by_Id
    )


    "ParametetSetName is $($PSCmdlet.ParameterSetName)"
}

输出：

Test-ParameterSets : Parameter set cannot be resolved using the specified named parameters.
At line:25 char:1
+ Test-ParameterSets
+ ~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidArgument: (:) [Test-ParameterSets], ParameterBindingException
    + FullyQualifiedErrorId : AmbiguousParameterSet,Test-ParameterSets

当您有不同的行为或使用不同的参数时，通常使用ParamaterSetName，具体取决于您的函数用户使用的参数集。规则是正确的。您可以使用DefaultParameterSetName属性的CmdletBinding属性帮助PowerShell确定正在使用的参数。

PowerShell：每个参数集必须至少有一个对该参数集唯一的参数

1 个答案: