Select-Object cmdlet 中输出的可变字段数
Variable number of fields to output in Select-Object cmdlet
假设我有一个包含描述多个实体的数据的 Obj。
我想像这样输出它(CSV,HTML,格式-Table,随便什么):
Property Code Property descr. Entity1 Entity2 Entity3
abs_de234 abs prop for de 132 412 412
abs_fe234 abs prop for fe 423 432 234
... ... ... ... ...
我会使用类似的东西:
$ObjData | % {Select-Object @{Label = "Property Code"; Expression = {$_.propcode}}, @{Label = "Property Desc."; Expression = {$_.descr}}, @{Label = "Entity1"; Expression = {$_.entity1}}, @{Label = "Entity2"; Expression = {$_.entity2}},@{Label = "Entity3"; Expression = {$_.entity3}} }| Format-Table
但是,如果我的对象具有可变数量的实体怎么办?假设这些属性都在一个数组中:
$EntityList = @('Entity1', 'Entity2', 'Entity4', 'Entity5', 'Entity5')
如何根据$EntityList
构建对应的Select-Object
命令?
更新:基于 Select-Object
的帮助:
Select-Object
[-InputObject <PSObject>]
[[-Property] <Object[]>]
[-ExcludeProperty <String[]>]
[-ExpandProperty <String>]
[-Unique]
[-Last <Int32>]
[-First <Int32>]
[-Skip <Int32>]
[-Wait]
[<CommonParameters>]
这是否意味着我应该可以只使用 Select-Object -Property $EntityList
?
| % {Select-Object
不要使用 %
(ForEach-Object
cmdlet)通过管道传输到 Select-Object
- 直接通过管道 到 Select-Object
.
@{Label = "Entity1"; Expression = {$_.entity1}}
除非需要更改标签(属性)名称的大小写,只需将entity1
传递给Select-Object
即可。
与任何接受 array 对象的 cmdlet 参数一样,您可以自由地将数组作为数组文字传递(元素通过 ,
) 或作为先前构造的数组通过变量传递:
# Properties that need renaming.
# Note: Unless you need to *transform* the input property value,
# you don't strictly need a *script block* ({ ... }) and can use
# a *string* with the property name instead.
# E.g., instead of {$_.propcode} you can use 'propcode'
$propDefs =
@{Label = "Property Code"; Expression = {$_.propcode}},
@{Label = "Property Desc."; Expression = {$_.descr}}
# Add properties that can be extracted as-is:
$propDefs += 'Entity1', 'Entity2', 'Entity4', 'Entity5', 'Entity5'
# Note: Passing the array *positionally* implies binding to the -Property parameter.
$ObjData | Select-Object $propDefs # add Format-Table, if needed, for display formatting
演示:
# Sample input object
$ObjData = [pscustomobject] @{
propcode = 'pc'
descr = 'descr'
Entity1 = 'e1'
Entity2 = 'e2'
Entity3 = 'e3'
Entity4 = 'e4'
Entity5 = 'e5'
}
$propDefs =
@{Label = "Property Code"; Expression = {$_.propcode}},
@{Label = "Property Desc."; Expression = {$_.descr}}
$propDefs += 'Entity1', 'Entity2', 'Entity3', 'Entity4', 'Entity5'
$ObjData | Select-Object $propDefs
以上结果:
Property Code : pc
Property Desc. : descr
Entity1 : e1
Entity2 : e2
Entity3 : e3
Entity4 : e4
Entity5 : e5
假设我有一个包含描述多个实体的数据的 Obj。 我想像这样输出它(CSV,HTML,格式-Table,随便什么):
Property Code Property descr. Entity1 Entity2 Entity3
abs_de234 abs prop for de 132 412 412
abs_fe234 abs prop for fe 423 432 234
... ... ... ... ...
我会使用类似的东西:
$ObjData | % {Select-Object @{Label = "Property Code"; Expression = {$_.propcode}}, @{Label = "Property Desc."; Expression = {$_.descr}}, @{Label = "Entity1"; Expression = {$_.entity1}}, @{Label = "Entity2"; Expression = {$_.entity2}},@{Label = "Entity3"; Expression = {$_.entity3}} }| Format-Table
但是,如果我的对象具有可变数量的实体怎么办?假设这些属性都在一个数组中:
$EntityList = @('Entity1', 'Entity2', 'Entity4', 'Entity5', 'Entity5')
如何根据$EntityList
构建对应的Select-Object
命令?
更新:基于 Select-Object
的帮助:
Select-Object
[-InputObject <PSObject>]
[[-Property] <Object[]>]
[-ExcludeProperty <String[]>]
[-ExpandProperty <String>]
[-Unique]
[-Last <Int32>]
[-First <Int32>]
[-Skip <Int32>]
[-Wait]
[<CommonParameters>]
这是否意味着我应该可以只使用 Select-Object -Property $EntityList
?
| % {Select-Object
不要使用 %
(ForEach-Object
cmdlet)通过管道传输到 Select-Object
- 直接通过管道 到 Select-Object
.
@{Label = "Entity1"; Expression = {$_.entity1}}
除非需要更改标签(属性)名称的大小写,只需将entity1
传递给Select-Object
即可。
与任何接受 array 对象的 cmdlet 参数一样,您可以自由地将数组作为数组文字传递(元素通过 ,
) 或作为先前构造的数组通过变量传递:
# Properties that need renaming.
# Note: Unless you need to *transform* the input property value,
# you don't strictly need a *script block* ({ ... }) and can use
# a *string* with the property name instead.
# E.g., instead of {$_.propcode} you can use 'propcode'
$propDefs =
@{Label = "Property Code"; Expression = {$_.propcode}},
@{Label = "Property Desc."; Expression = {$_.descr}}
# Add properties that can be extracted as-is:
$propDefs += 'Entity1', 'Entity2', 'Entity4', 'Entity5', 'Entity5'
# Note: Passing the array *positionally* implies binding to the -Property parameter.
$ObjData | Select-Object $propDefs # add Format-Table, if needed, for display formatting
演示:
# Sample input object
$ObjData = [pscustomobject] @{
propcode = 'pc'
descr = 'descr'
Entity1 = 'e1'
Entity2 = 'e2'
Entity3 = 'e3'
Entity4 = 'e4'
Entity5 = 'e5'
}
$propDefs =
@{Label = "Property Code"; Expression = {$_.propcode}},
@{Label = "Property Desc."; Expression = {$_.descr}}
$propDefs += 'Entity1', 'Entity2', 'Entity3', 'Entity4', 'Entity5'
$ObjData | Select-Object $propDefs
以上结果:
Property Code : pc
Property Desc. : descr
Entity1 : e1
Entity2 : e2
Entity3 : e3
Entity4 : e4
Entity5 : e5