通過哈希表數組篩選csv文件

Question

我正在嘗試的是使用哈希表（來自數據庫的用戶信息）數組篩選csv文件（恰好是weblog）。

#$data is from a database. (about 500 items) Type: System.Data.DataTable 
$users = @() 
foreach($row in $data) 
{ 
    $userItem = @{ 
     LoginId = $row[0] 
     LastName = $row[3] 
     FirstName = $row[4] 
     LastAccess = $null 
    } 
    $users += $userItem 
} 
#Log files are about 14,000 lines long 
$logfiles = Get-ChildItem $logFolder -Recurse | where {$_.Extension -eq ".log"} | Sort-Object BaseName -Descending 
foreach($log in $logfiles) 
{ 
    $csvLog = Import-Csv $log.FullName -Header ("Blank","LoginId","Date") 
    $u = $users | Select {&_.LoginId} 
    $filteredcsvLog = $cvsLog | Where-Object { $u -contains $_.LoginId} 
    #This returns null 
    .... 

} 

這似乎不起作用，我錯過了什麼。我的猜測是，我需要將數組變成[string []]，但我似乎無法做到這一點。

Answer 1

而不是做哈希表的數組，我會做定製的哈希表對象如：

$users = @{} 
foreach($row in $data) 
{ 
    $userItem = new-object psobject -property @{ 
     LoginId = $row[0] 
     LastName = $row[3] 
     FirstName = $row[4] 
     LastAccess = $null 
    } 
    $users[$userItem.LoginId] = $userItem 
} 

然後過濾更容易和更快：

foreach($log in $logfiles) 
{ 
    $csvLog = Import-Csv $log.FullName -Header ("Blank","LoginId","Date") 
    $filteredcsvLog = $cvsLog | Where-Object { $users[$_.LoginId} } 
    .... 
}