PowerShell cmdlet 显示属性，但无法通过“选择"显示它 [英] PowerShell cmdlet shows property, but it can't display it through 'select'

问题描述

我正在尝试执行以下语句.

I am trying to execute the following statement.

dir IIS:\Sites| foreach{ get-webapplication -site $_.Name} | select -first 1

结果是

Name             Application pool   Protocols    Physical Path
----             ----------------   ---------    -------------
i1               DefaultWebSite     http         C:\inetpub\hosts\DefaultWebSite\i1

但是当我执行下面的结果是空的

But when I execute the following the result is empty

dir IIS:\Sites| foreach{ get-webapplication -site $_.Name} | select -first 1 name

所以我查看了这个对象的属性

So I looked into the properties for this object

dir IIS:\Sites| foreach{ get-webapplication -site $_.Name} | select -first 1 | get-member | sort
Name | select Name, MemberType | format-table -auto

Name                                MemberType
----                                ----------
applicationPool                   NoteProperty
Attributes                            Property
ChildElements                         Property
ClearLocalData                          Method
Collection                        NoteProperty
ConfigurationPathType             NoteProperty
Copy                                    Method
Delete                                  Method
ElementTagName                        Property
enabledProtocols                  NoteProperty
Equals                                  Method
GetAttribute                            Method
GetAttributeValue                       Method
GetChildElement                         Method
GetCollection                           Method
GetHashCode                             Method
GetMetadata                             Method
GetParentElement                        Method
GetType                                 Method
Item                     ParameterizedProperty
ItemXPath                         NoteProperty
LoadProperties                          Method
Location                          NoteProperty
Methods                               Property
path                              NoteProperty
PhysicalPath                    ScriptProperty
PSPath                            NoteProperty
Schema                                Property
SetAttributeValue                       Method
SetMetadata                             Method
ToPSObject                              Method
ToString                                Method
Update                                  Method
UpdateCollection                        Method
virtualDirectoryDefaults          NoteProperty

所以没有名称"属性.get-webapplication 可以显示name属性，但是我们不能选择它是怎么回事?

So no 'Name' property. How is it that the get-webpplication can show the name property, but we cant select it?

推荐答案

WebAdministration 模块定义相关类型的默认格式.在这种情况下，您获得的 WebApplication 类型为 Microsoft.IIs.PowerShell.Framework.ConfigurationElement#site#application

The WebAdministration module defines default format for the concerned type. In this case, the WebApplication that you get is of type Microsoft.IIs.PowerShell.Framework.ConfigurationElement#site#application

如果查看模块下的文件iisprovider.format.ps1xml(通常位于C:\Windows\System32\WindowsPowerShell\v1.0\Modules\WebAdministration)，你会看到为该类型的Name指定的格式如下:

If you look at the file iisprovider.format.ps1xml under the module ( usually located at C:\Windows\System32\WindowsPowerShell\v1.0\Modules\WebAdministration), you will see that the format specified for the Name of this type is as below:

...
<TableColumnItem>
   <ScriptBlock>
        $name = $_.Path.Trim('/')
        $name
   </ScriptBlock>
</TableColumnItem>
...

因此该名称实际上是从 $_.Path.Trim('/') 获得的，因此您可以根据需要执行相同的操作:

Thus the name is actually got from $_.Path.Trim('/'), so you can do the same if you want:

get-webapplication -site "test" | select @{e={$_.Path.Trim('/')};l="Name"}

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