PowerShell Select-Object Property和ExpandProperty的差别

Posted 2021-12-11 师万物的博客

环境配置说明

• Windows 21H1
• PSVersion 5.1.19041.1320

 

示例

PS C:\\Users\\admin> Get-Alias | Select-Object  -Property ModuleName | Get-Member

   TypeName:Selected.System.Management.Automation.AliasInfo

Name        MemberType   Definition                    
----        ----------   ----------                    
Equals      Method       bool Equals(System.Object obj)
GetHashCode Method       int GetHashCode()             
GetType     Method       type GetType()                
ToString    Method       string ToString()             
ModuleName  NoteProperty string ModuleName=   

PS C:\\Users\\admin> Get-Alias | Select-Object  -ExpandProperty ModuleName | Get-Member

   TypeName:System.String

Name             MemberType            Definition                                                               
----             ----------            ----------                                                               
Clone            Method                System.Object Clone(), System.Object ICloneable.Clone()                  
CompareTo        Method                int CompareTo(System.Object value), int CompareTo(string strB), int IC...
Contains         Method                bool Contains(string value)                                              
CopyTo           Method                void CopyTo(int sourceIndex, char[] destination, int destinationIndex,...
EndsWith         Method                bool EndsWith(string value), bool EndsWith(string value, System.String...
Equals           Method                bool Equals(System.Object obj), bool Equals(string value), bool Equals...
GetEnumerator    Method                System.CharEnumerator GetEnumerator(), System.Collections.IEnumerator ...
GetHashCode      Method                int GetHashCode()                                                        
GetType          Method                type GetType()                                                           
GetTypeCode      Method                System.TypeCode GetTypeCode(), System.TypeCode IConvertible.GetTypeCode()

.....

• -ExpandProperty ModuleName 的返回类型是 System.String ，更适合作参数，适用范围较广

PS C:\\Users\\admin> Get-Alias | Select-Object  -Property ModuleName | Select-Object -First 10

ModuleName                  
----------                  

Microsoft.PowerShell.Utility

PS C:\\Users\\admin> Get-Alias | Select-Object  -ExpandProperty ModuleName | Select-Object -First 10

Microsoft.PowerShell.Utility

 

学习资料

• PowerShell 版本 + 工具
• PowerShell/PowerShell
• 51CTO社区

 

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