Setting permissions on a folder

Question

2010, c# server object model

I'm trying to programmatically assign permissions to specific folders in a document library (see my original post here) but I'm hung up on selecting a folder as an SPListItem. In the past I've always used SPFolder to create and manipulate folders, but I can't figure out how to cast that as an SPListItem which is necessary for permission editing. Any insight or even just links to articles are appreciated!

Edit: The SPFolder.Item property is what I'm looking for, but I've run into a new problem trying to use it. I'm picking the folder by building a string for its Url and then calling the GetFolder method on the SPWeb. When I then call the .Item property on it, I get the exception "The object specified does not belong to a list." I'm guessing that's because I called it off the SPWeb and not an SPList, but I don't know another way to select that specific folder. See the code below for an example.

string fullPath = parentFolder + projectFolder + phase1Folder; // This is a dynamically generated Url
//For example, "site/web/Document Library 1/Project Name/Phase 1"
SPFolder oFolder = oWeb.GetFolder(fullPath);
SPListItem oItem = oFolder.Item; // This is where the exception is thrown

Answer 1

Use the SPFolder.Item property. A generic example:

foreach (SPFolder folder in collFolders)
{
  SPListItem item = folder.Item
}