Formatting - at once - all the files in a Visual Studio project

Question

I am interested in formatting all the files in a Visual Studio (ver. 2005) project all at once.

Currently, there is a way to format a single document by doing somet

Answer 1

Additional step needed for Visual Studio 2015

Phil Haack's solution posted by ANeves is perfect, but for some reason $item.FileCodeModel.Language always returns null in Visual Studio 2015 making the Format-Document skip all files and effectively do nothing.

To (hackily) work around this limitation you can replace the Get-Language function:

# Convert language guid to friendly name
function Get-Language($item) {
    if(!$item.FileCodeModel) {
        return $null
    }

    $kind = $item.FileCodeModel.Language
    switch($kind) {
        '{B5E9BD34-6D3E-4B5D-925E-8A43B79820B4}' { 'C#' }
        '{B5E9BD33-6D3E-4B5D-925E-8A43B79820B4}' { 'VB' }
        default { $kind }
    }
}

with the following variant that uses the file's extension instead of the Language GUID:

# Convert file extension to friendly language name
function Get-Language($item) {
   if(!$item.FileCodeModel) {
       return $null
   }

   $filename = $item.Name
   $ext = $filename.substring($filename.lastindexof('.'),
                              ($filename.length - $filename.lastindexof('.')))
   switch($ext) {
       '.cs' { 'C#' }
       '.vb' { 'VB' }
       # If you want to prevent re-formatting files that are not VB or C# source files 
       # (e.g. XML files in your project etc.), replace the following line with 
       # "default { $null }" (thanks to HHenn for this suggestion!)
       default { $ext }
   }            
}