Bulk upgrade VS2005 solutions to VS2008

Question

Is it possible to bulk upgrade (many at the same time) VS 2005 projects to VS 2008.

I know that I can open one at a time, however, I would like to select say 10 at a time to upgrade and add to a new solution.

Answer 1

I recently came across the same problem and used a Windows Powershell script to get Visual Studio to do the upgrading for me using the /upgrade command line switch

$slnFiles = ls C:\source -Filter *.sln -Recurse 
$devenv = "C:\Program Files (x86)\Microsoft Visual Studio 9.0\Common7\IDE\devenv.exe"
$i = 1
foreach ($sln in $slnFiles)
{
    "Upgrading Solution " + $i++ + ": " + $sln.FullName
    &$devenv /upgrade $sln.FullName
}
"Done!"

Answer 2

Slightly modified version of Casey's which is a for VS 2010 and waits for the conversion to complete. This also copies the solution file to one with an x before the .sln.

$slnFiles = ls "C:\projects\source\" -Filter *.sln -Recurse 
$devenv = "C:\Program Files (x86)\Microsoft Visual Studio 10.0\Common7\IDE\devenv.exe"
$i = 1
foreach ($sln in $slnFiles)
{
    "Upgrading Solution " + $i++ + ": " + $sln.FullName
    Start-Process -Wait $devenv -ArgumentList /NoSplash,/upgrade,$sln.FullName
    $name = $sln.name -replace ".sln", "x.sln" 
    Rename-Item $sln.FullName  -NewName $name
}
"Done!"