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Question

我能够打印出if..elseif..else的最终结果，如下所示：

clear-host
$errorCode = 0
$object = "InstanceName", "DatabaseName", "PrinicipalName", "PrinicipalType", "Permission", "ObjectTypeLevel", "ObjectName"
$logfile = "C:\temp\cep\gogo.csv"
$oldFile = "C:\temp\cep\Book1.csv"
$newFile = "C:\temp\cep\Book2.csv"
if ((Test-Path $oldFile) -And (Test-Path $newFile)) {
    $impFileOld = Import-Csv $oldFile -Header $object | Sort-object -Property $object -unique 
    $impFileNew = Import-Csv $newFile -Header $object | Sort-object -Property $object -unique 
    $result = Compare-Object $impFileOld $impFileNew -Property $object -PassThru
    $result | %{if ($_.SideIndicator -eq '=>') {write-host "book2"} #show result
        elseif($_.SideIndicator -eq '<=') {write-host "book1"}
            else {Add-Content $logfile "no changes found."
                    #$errorCode = 0    
                }
            }
    } else {
            Add-Content $logfile "files does not exist!"
            #$errorCode = 1            
            exit 1
};

但是当我用select-object替换它并将最终结果写入另一个.cvs文件时，似乎连接丢失了＆＃39;或通过infor：请在下面的代码：

clear-host
$errorCode = 0
$object = "InstanceName", "DatabaseName", "PrinicipalName", "PrinicipalType", "Permission", "ObjectTypeLevel", "ObjectName"
$logfile = "C:\temp\cep\gogo.csv"
$oldFile = "C:\temp\cep\Book1.csv"
$newFile = "C:\temp\cep\Book2.csv"
if ((Test-Path $oldFile) -And (Test-Path $newFile)) {
    $impFileOld = Import-Csv $oldFile -Header $object | Sort-object -Property $object -unique 
    $impFileNew = Import-Csv $newFile -Header $object | Sort-object -Property $object -unique 
    $result = Compare-Object $impFileOld $impFileNew -Property $object -PassThru
    $result | %{if ($_.SideIndicator -eq '=>') {Select-Object $object | export-csv $logfile -NoTypeInfo} #cannot print result to .csv file  ????
        elseif($_.SideIndicator -eq '<=') {Select-Object $object | export-csv $logfile -NoTypeInfo} 
            else {Add-Content $logfile "no changes found."
                    #$errorCode = 0    
                }
            }
    } else {
            Add-Content $logfile "files does not exist!"
            #$errorCode = 1            
            exit 1
};

Answer 1

您的代码存在多个问题，而且不会让您受到攻击。

1. 你不能像在foreach中那样选择（代码中的％）
2. 没有必要测试Sideindicator，因为你总是在同一个文件中记录而你没有在比较命令中使用-IncludeEqual选项
3. 你测试是否改变它的不正确
4. -Passthru选项不是必需的
5. 在import-csv之后不需要排序，因为比较命令比较字段
6. 您可以简化代码以获得更好的可用性

如果你提出一个简化版本：

cls
$object = "InstanceName", "DatabaseName", "PrinicipalName", "PrinicipalType", "Permission", "ObjectTypeLevel", "ObjectName"
$logfile = "C:\temp\cep\gogo.csv"
$oldFile = "C:\temp\cep\Book1.csv"
$newFile = "C:\temp\cep\Book2.csv"

if (!(Test-Path $oldFile) -Or !(Test-Path $newFile)) 
{
    Add-Content $logfile "files does not exist!"
    exit 1
}

$impFileOld = Import-Csv $oldFile -Header $object 
$impFileNew = Import-Csv $newFile -Header $object 
$result = Compare $impFileOld $impFileNew -Property $object

if ($result -eq $null)
{
    Add-Content $logfile "no changes found." 
}
else
{
   $result | where SideIndicator -eq '=>' | select $object | sort $object | export-csv "C:\temp\cep\gogoBook2.csv" -NoType
   $result | where SideIndicator -eq '<=' | select $object | sort $object | export-csv "C:\temp\cep\gogoBook1.csv" -NoType
}