我正在编写一个函数，其中两个参数应该是独占的和可选的。
以下是有效输入：
new-event -Title sometitle -Text sometext -TimestampHappened 1234567 -SomeOtherOptionalParam somestring
new-event -Title sometitle -Text sometext -DateHappened (get-date) -SomeOtherOptionalParam somestring
new-event -Title sometitle -Text sometext -SomeOtherOptionalParam somestring
new-event -Title sometitle -Text sometext
这是一个无效的输入：
new-event -Title sometitle -Text sometext -DateHappened (get-date) -TimestampHappened 1234567 -SomeOtherOptionalParam somestring
到目前为止，这是我的代码：
[CmdletBinding()]
# Most parameters belong to Default, New-Event:ByDate and New-Event:ByTimestamp parameter sets
param (
[Parameter(
Position=0,
Mandatory=$True,
ParameterSetName="Default"
)]
[Parameter(
Position=0,
Mandatory=$True,
ParameterSetName="New-Event:ByDate"
)]
[Parameter(
Position=0,
Mandatory=$True,
ParameterSetName="New-Event:ByTimestamp"
)]
[ValidateNotNullOrEmpty()]
[String]$Title,
[Parameter(
Position=1,
Mandatory=$True,
ParameterSetName="Default"
)]
[Parameter(
Position=1,
Mandatory=$True,
ParameterSetName="New-Event:ByDate"
)]
[Parameter(
Position=1,
Mandatory=$True,
ParameterSetName="New-Event:ByTimestamp"
)]
[ValidateNotNullOrEmpty()]
[String]$Text,
[Parameter(
Position=2,
Mandatory=$False,
ParameterSetName="New-Event:ByDate"
)]
[ValidateNotNullOrEmpty()]
[datetime]$DateHappened,
[Parameter(
Position=2,
Mandatory=$False,
ParameterSetName="New-Event:ByTimestamp"
)]
[ValidateNotNullOrEmpty()]
[Double]$TimestampHappened,
[Parameter(
Position=3,
Mandatory=$False,
ParameterSetName="Default"
)]
[Parameter(
Position=3,
Mandatory=$False,
ParameterSetName="New-Event:ByDate"
)]
[Parameter(
Position=3,
Mandatory=$False,
ParameterSetName="New-Event:ByTimestamp"
)]
[String]$SomeOtherParam,
...
这是我打电话时得到的Get-Help：
PS> get-help New-Event
NAME
New-Event
SYNOPSIS
Post an event to the stream.
SYNTAX
New-Event [-Title] <String> [-Text] <String> [[-TimestampHappened] <Double>] [[-Priority] <String>] [[-Hostname] <String>] [[-Tags] <String[]>] [[-AlertType] <String>] [<CommonParameters>]
New-Event [-Title] <String> [-Text] <String> [[-DateHappened] <DateTime>] [[-Priority] <String>] [[-Hostname] <String>] [[-Tags] <String[]>] [[-AlertType] <String>] <String>] [<CommonParameters>]
New-Event [-Title] <String> [-Text] <String> [[-Priority] <String>] [[-Hostname] <String>] [[-Tags] <String[]>] [[-AlertType] <String>] [<CommonParameters>]
但是，当我尝试仅使用两个强制参数调用函数时，出现以下错误：
New-Event -Title test -Text text
New-Event : Parameter set cannot be resolved using the specified named parameters.
At line:1 char:1
+ New-Event -Title test -Text text
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : InvalidArgument: (:) [New-Event], ParameterBindingException
+ FullyQualifiedErrorId : AmbiguousParameterSet,New-Event
我在这里遗漏了一些东西，但我不知道是什么......
如何获得两个互斥且可选的参数？