如何使用 PowerShell Get-Member cmdlet [英] How to use PowerShell Get-Member cmdlet

问题描述

一个新手问题:

命令:

[Math] | Get-Member

返回 System.RuntimeType 的所有成员.这是为什么?

Returns all members of System.RuntimeType. Why is that?

还有命令:

Get-Member -InputObject [Math]

返回System.String 的所有成员.如果 [Math] 在这里被解释为字符串，我怎样才能使它成为一个数学对象?

Returns all members of System.String. If [Math] is interpreted as string here, how can I make it a math object?

另外，Get-member 是否接受任何位置参数?我怎么知道?

Also, does Get-member takes any positional parameters? How can I tell?

推荐答案

您正在从 [Math] 获得 System.RuntimeType，因为它就是这样.它是一个类类型，而不是该特定类型的对象.您实际上还没有构建 [Math] 对象.如果您键入:

You are getting a System.RuntimeType from [Math] because that is what it is. It's a Class type as opposed to an object of that particular type. You haven't actually constructed a [Math] object. You will get the same output if you typed:

[String] | gm

但是，如果您从 String 类型构造一个字符串对象，您将获得字符串成员:

However, if you constructed a string object from the String type, you would get the string members:

PS C:\> [String]("hi") | gm


   TypeName: System.String

Name             MemberType            Definition
----             ----------            ----------
Clone            Method                System.Object Clone()
CompareTo        Method                System.Int32 CompareTo(Object value), System.Int32 CompareTo(String strB)
Contains         Method                System.Boolean Contains(String value)
CopyTo           Method                System.Void CopyTo(Int32 sourceIndex, Char[] destination, Int32 destinationIn...
etc...

因为 System.Math 只有静态成员，所以不能构造它的对象.要查看它的成员，您可以使用 System.RuntimeType 的 GetMembers() 函数:

Since System.Math has only static members, you can't construct an object of it. To see it's members you can use the GetMembers() function of System.RuntimeType:

[Math].GetMethods()

您可以使用 format-* cmdlet 之一来格式化输出:

You can use one of the format-* cmdlets to format the output:

[Math].GetMethods() | format-table

哦，我应该补充一点，要调用静态成员之一，您可以这样做:

Oh, and I should add, to invoke one of the static members, you would do it like this:

[Math]::Cos(1.5)

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