访问具有无效变量名称的管道变量属性

时间:2012-04-19 22:41:46

标签: powershell scripting pipeline

我正在编写一个powershell高级函数,它将从管道中获取输入。更具体地说,我将从import-csv输入。问题是我正在使用的csv文件的列标题使用对ps无效的语法。这是我的代码就像

function my-function{
    [CmdletBinding()]
    params
    (
        [Parameter(Mandatory=$false,ValueFromPipeline=$true,          
                    ValueFromPipelineByPropertyName=$true)]
        [string]$Id = $_.ID,


        [(Parameter(Mandatory=$false,ValueFromPipeline=$true,
                      ValueFromPipelineByPropertyName=$true)]
        [string]$IdRaw =  $_."ID(RAW)",
    )

    BEGIN{
         #Sets up a db connection
    }
    PROCESS{
         #Builds an insert query with csv members
    }
    END{
         #closes db connection
    }
}

ID,ID(RAW),Date Time,Date Time(RAW),Type,Type(RAW)
29874,29874,4/18/2012 23:58,41018.20753, Servername, ServernameRaw

当我使用我的csv输入执行此操作时,$ Id的值变为2905,而$ IdRaw变量采用整个$ _哈希表的字符串表示形式。只是为了详细说明任何有效名称{URL,ID,Status}的参数都可以。任何包含空格或(RAW)的都会收到整个$ _变量。

-Patrick

1 个答案:

答案 0 :(得分:3)

#Edit to include updated code
$x=import-csv c:\temp\testinput.csv

function my-function{
 [CmdletBinding()]
    param
    (
        [Parameter(Mandatory=$false,ValueFromPipeline=$true, ValueFromPipelineByPropertyName=$true)][string]$Id,
        [Parameter(Mandatory=$false,ValueFromPipeline=$true,ValueFromPipelineByPropertyName=$true)]
        [alias("ID(RAW)")][string]$IdRaw 
    )

    begin{
         #Sets up a db connection
         Write-Debug "Starting"
    }
    process {
         #Builds an insert query with csv members
         write-debug "IDRaw=$IDRaw"
    }
    end {
         #closes db connection
                 Write-Debug "Ending"

    }
}

$x | my-function
示例文件内容

ID,ID(RAW),日期时间,日期时间(RAW),类型,类型(RAW) 29874,29877,4 / 18/2012 23:58,41018.20753,Servername1,ServernameRaw1 29875,29878,4 / 19/2012 23:58,41018.20753,Servername2,ServernameRaw2 29876,29879,4 / 20/2012 23:58,41018.20753,Servername3,ServernameRaw3