How to use powershell to reorder CSV columns

Question

Input file:

column1;column2;column3
data1a;data2a;data3a
data1b;data2b;data3b

Goal: output file with reordered columns, say

Answer 1

It's great that people came with their solutions based on pure .NET. However, I would fight for the simplicity, if possible. That's why I upvoted all of you ;)

Why? I tried to generate 1.000.000 records and store it in CSV and then reorder the columns. Generating the csv was in my case much more demanding then the reordering. Look at the results.

It took only 1,8 minute to reorder the columns. For me it's pretty decent result. Is it ok for me? -> Yes, I don't need to try to find out quicker solution, it's good enough -> saved my time for some other interesting stuff ;)

# generate some csv; objects have several properties
measure-command { 
    1..1mb | 
    % { 
        $date = get-date
        New-Object PsObject -Property @{
            Column1=$date
            Column2=$_
            Column3=$date.Ticks/$_ 
            Hour = $date.Hour
            Minute = $date.Minute
            Second = $date.Second
            ReadableTime = $date.ToLongTimeString()
            ReadableDate = $date.ToLongDateString()
        }} | 
    Export-Csv d:\temp\exported.csv 
}

TotalMinutes      : 6,100025295

# reorder the columns
measure-command { 
    Import-Csv d:\temp\exported.csv | 
        Select ReadableTime, ReadableDate, Hour, Minute, Second, Column1, Column2, Column3 | 
        Export-Csv d:\temp\exported2.csv 
}

TotalMinutes      : 2,33151559833333