比较 2 个 csv 文件的不同列

Question

I am trying to compare 2 colums in 2 csv files with eachother so that i can check if there are differences in the 2 files. Because 1 of the files is a export from a incident management system, the headers that are being used are different. This means that i have to compare the items under the first header of the first file(Meldings-nummer) to the ones under the second header of the second file, which is Incidentnummer.

I got it to work if the headers are the same, using following code. However, this doesnt work using different headernames and it also doesn´t show the results.

$firstFile = read-host - prompt "Please input exact file location of first .csv file"
$secFile = read-host - prompt "Please input exact file location of second .csv file"
$ff = Import-Csv $firstFile
$sf = Import-Csv $secFile
Compare-Object -referenceobject $ff -differenceobject $sf -includeequal |Where-Object {$_.SideIndicator -ne "=="} |Select -ExpandProperty InputObject

Or, using the easier version that shows only meldings-nummer:

$file1 = import-csv -Path "C:\Users\Documents\scripts\Powershell\Overzicht_Meldingen_2015-10-21.csv" 
$file2 = import-csv -Path "C:\Users\Documents\scripts\Powershell\Overzicht_Meldingen_2015-10-21aangepast.csv" 
Compare-Object $file1 $file2 -property Meldings-nummer

This is the one that´s preferred, but then with the flexibility of the first one(having to manually enter the file location)

Does anyone know how to, or have any tips so i can archieve the comparing of different columns and showing them?

UPDATE I just found some code that i adjusted. I think this should compare the 2 files and give a new file that shows the differences. Even though it executes fine and gives me the file, there is nothing in the file except for the text 'Wijziging'.

 $OldCSV = import-csv -Path "C:\Users\Documents\scripts\Powershell\Overzicht_Meldingen_2015-10-21.csv" 
 $NewCSV = import-csv -Path "C:\Users\Documents\scripts\Powershell\Overzicht_Meldingen_2015-10-21aangepast.csv" 

 $output = @()  
     forEach ($Column in $OldCsv) {      
        $result = $NewCSV | Where-Object {$Column."Meldings-nummer" -eq          $_.Incidentnummer}  
        $Melding = if ($Column.Powerstate -ne $result.PowerState)    {"Previous: " + $Column."Meldings-nummer" + " | Now:" + $result.Incidentnummer}  
         $output += New-object PSObject -property @{  
         #VMname = $Column.Name  
         Wijziging = $Melding  

       }  
     }  
   $output | select-object Wijziging | Export-Csv -Path    C:\Users\Documents\scripts\Powershell\Changes.csv -NoTypeInformation  

Answer 1

thanks for al the help but i think i solved it myself using the following code.

$file1 = import-csv -Path "C:\Users\Documents\scripts\Powershell\Overzicht_Meldingen_2015-10-21.csv" -header Meldings-nummer
$file2 = import-csv -Path "C:\Users\Documents\scripts\Powershell\Tweedelijns_incidenten14.csv" -header Incidentnummer 
Where-Object {$File1."Meldings-nummer" -ne $file2.Incidentnummer}
Compare-Object $file1 $file2

Now i can put the finishing touch in it so it ask for the csv files like in the first code

Answer 2

Assuming the first file has the Meldings-nummer in ascending sequence and the second file has the Incidentnummer in ascending sequence, you could do it like this:

[int] $i = 0
[int] $j = 0
while ($i -le $ff.Count)
{
    if ($ff[$i].'Meldings-nummer' -lt $sf[$j].IncidentNummer -or $j -gt $sf.Count)
    { 
        Write-Host ("Meldings-nummer {0} not in second file." -f $ff[$i].'Meldings-nummer')
        $i++
    }
    while ($ff[$i].'Meldings-nummer' -gt $sf[$j].IncidentNummer -or $i -gt $ff.Count)
    {
        if ($j -ge $sf.Count)
            { break }
        Write-Host ("IncidentNummer {0} not in first file." -f $sf[$j].IncidentNummer)
        $j++
    }
    if ($ff[$i].'Meldings-nummer' -eq $sf[$j].IncidentNummer)
    { 
        $j++ 
        $i++
    }
}