.net - 在 Powershell 2 中声明第三方程序集类型的通用列表

Question

我正在尝试创建一个新的 Collections.Generic.List类型对象 Amazon.Cloudwatch.Model.Dimensions在 Powershell 2.0 中。

我可以创建一个 Amazon.Cloudwatch.Model.Dimensions对象成功:

> $dimension = New-Object Amazon.Cloudwatch.Model.Dimensions

我可以创建一个 Collections.Generic.List类型对象 string和:

> $list = New-Object Collections.Generic.List[string]

但是，当我尝试创建一个 Collections.Generic.List 时类型对象 Amazon.Cloudwatch.Model.Dimensions ，我收到以下错误:

> $list = New-Object Collections.Generic.List[Amazon.Cloudwatch.Model.Dimension]

New-Object : Cannot find type 
[Collections.Generic.List[Amazon.Cloudwatch.Model.Dimension]]: make sure the assembly containing this type is loaded.
At line:1 char:19
+ $list = New-Object <<<<  
Collections.Generic.List[Amazon.Cloudwatch.Model.Dimension]
    + CategoryInfo          : InvalidType: (:) [New-Object], 
PSArgumentException
    + FullyQualifiedErrorId : 
TypeNotFound,Microsoft.PowerShell.Commands.NewObjectCommand

相同的语句适用于 Powershell 3.0，因此看起来这是由 Powershell 2.0 泛型查找程序集的方式引起的。根据 another SO answer Powershell 2.0 中存在一个可能与此相关的错误:

However, there's an unfortunate catch. In PowerShell 2.0, there's a bug when you mix and match BCL and 3rd party types as type parameters. The latter need to be assembly qualified:

# broken over two lines for clarity with backtick escape
$o = new-object ('collections.generic.dictionary[[{0}],[{1}]]' -f `
    [type1].fullname, [type2].fullname)

Hope this helps. In PowerShell 3.0, this has been fixed.

我(有点)尝试过这个，但没有成功。

和 another SO answer建议通过以下方式进一步限定大会:

The solution is to specify the fully qualified assembly name for the generic parameter types. It's extremely ugly, but works:

$bar = new-object "System.Collections.Generic.Dictionary``2[[System.String, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089],[System.String, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]]"

我试过了:

> $list = New-Object "System.Collections.Generic.List``1[[Amazon.CloudWatch.Model.Dimension, AWSSDK.CloudWatch, Version=3.3.0.0, Culture=neutral, PublicKeyToken=885c28607f98e604]]"

也无功而返。

> $list = New-Object "System.Collections.Generic.List``1[[Amazon.CloudWatch.Model.Dimension, AWSSDK.CloudWatch, Version=3.3.0.0, Culture=neutral, PublicKeyToken=885c28607f98e604]]"
New-Object : Cannot find type 
[System.Collections.Generic.List`1[[Amazon.CloudWatch.Model.Dimension, AWSSDK.CloudWatch, Version=3.3.0.0, Culture=neutral, PublicKeyToken=885c28607f98e604]]]: make sure the assembly containing this type is loaded.
At line:1 char:22
+ $dimlist = New-Object <<<<  
"System.Collections.Generic.List``1[[Amazon.CloudWatch.Model.Dimension, AWSSDK.CloudWatch, Version=3.3.0.0, Culture=neutral, PublicKeyToken=885c28607f98e604]]"
    + CategoryInfo          : InvalidType: (:) [New-Object], PSArgumentException
    + FullyQualifiedErrorId : TypeNotFound,Microsoft.PowerShell.Commands.NewObjectCommand

任何建议将不胜感激。

注: Amazon.Cloudwatch.Model.Dimensions来自 The AWS SDK for .NET

Answer 1

这是在 powershell 2.0 版中进行测试的，使用了您在问题中链接到的帖子中的想法组合:

Add-Type -Path "C:\Program Files (x86)\AWS SDK for .NET\bin\Net35\AWSSDK.CloudWatch.dll"
$o = "System.Collections.Generic.List``1" -as "Type"
$o = $o.MakeGenericType("Amazon.Cloudwatch.Model.Dimension" -as "Type")
$list = [Activator]::CreateInstance($o)

$list.gettype() | select UnderlyingSystemType

UnderlyingSystemType
--------------------
System.Collections.Generic.List`1[Amazon.CloudWatch.Model.Dimension]