Getting the list name from url with PowerShell

Question

I am trying to parse any given SharePoint URL and get back the site, web and list references using the code below. I would like to achieve this even if I provide the URL of an item. The code below works if i provide the URL of the list/library. If i provide the URL of an item in a list/library it throws an exception but also appears to work.

I do not understand why I am getting an exception when using an Item URL. What else do i need to do to make this work for any URL?

Code -

$listURL = "http://portal.contoso.com/sites/TEST/Shared%20Documents/Forms/AllItems.aspx"
$listURLWithItem= "http://portal.contoso.com/sites/TEST/Shared%20Documents/Test2.docx"
$site = New-Object Microsoft.SharePoint.SPSite($listURL)
$web = $site.OpenWeb()
$list = $web.GetListFromWebPartPageUrl($listURL)

"Output with list url-"
$site.url
$web.url
$list.Title

"Output when using item url-"
$site = New-Object Microsoft.SharePoint.SPSite($listURLWithItem)
$web = $site.OpenWeb()
$list = $web.GetListFromWebPartPageUrl($listURLWithItem)
$site.url
$web.url
$list.Title

The resulting output - with the second instance generating an exception

Output with list url-
http://portal.contoso.com/sites/TEST
http://portal.contoso.com/sites/TEST
Shared Documents

Output when using item url-
Exception calling "GetListFromWebPartPageUrl" with "1" argument(s): "Cannot complete this action.

Please try again."
At line:15 char:39
+ $list = $web.GetListFromWebPartPageUrl <<<< ($listURLWithItem)
    + CategoryInfo          : NotSpecified: (:) [], MethodInvocationException
    + FullyQualifiedErrorId : DotNetMethodException

http://portal.contoso.com/sites/TEST
http://portal.contoso.com/sites/TEST
Shared Documents

Answer 1

I had to check the URL and then call the appropriate method. Below is the script I finally put together and it is working for me so far.

if( $listURL.ToLower().Contains( "AllItems.aspx".ToLower() ) -or $listURL.ToLower().Contains( "DispForm.aspx".ToLower() ) )
{
    $site = New-Object Microsoft.SharePoint.SPSite($listURL)
    $web = $site.OpenWeb()

    $list=$web.GetListFromWebPartPageUrl($listURL);
    "Output with list url-"
    $site.url
    $web.url
    $list.Title
}
else
{
    $site = New-Object Microsoft.SharePoint.SPSite($listURL)
    $web = $site.OpenWeb()

    # Use GetListItem when URL contains list item, example - http://portal.contoso.com/Shared%20Documents/test.docx
    $listItem=$web.GetListItem($listURL);
    "Output with list item url-"
    $site.url
    $web.url
    $listItem.ParentList.Title
}

Answer 2

Please try the below script. I have tried to get the listitem object out of the url. A check is necessary if your Urls contain relative urls as well.

$site = New-Object Microsoft.SharePoint.SPSite($listURL)
$web = $site.OpenWeb()
$listitem=$web.GetListItem($listURL);
"Output with list url-"
$site.url
$web.url
$listitem.ParentList.Title

$site = New-Object Microsoft.SharePoint.SPSite($listURLWithItem)
$web = $site.OpenWeb()
$listitem=$web.GetListItem($listURLWithItem);
"Output with list url-"
$site.url
$web.url
$listitem.ParentList.Title

Answer 3

The page url you must provide is the url to the webpart page. The url you provide is the url to de actual document.

For example an url like

http://portal.contoso.com/sites/TEST/Shared%20Documents/Forms/DispForm.aspx?ID=1

should work.

SPList GetListFromWebPartPageUrl(string pageUrl)

pageUrlType: System.String
A string that contains the site-relative URL of a Web Part page, for example, /Lists/Announcements/AllItems.aspx.

See MSDN documentation for more information