SharePoint 2010 Client Object Model, get folder Item

Task: you need to apply permissions to the existing folder in the document library. But it can be done only for ListItem which corresponds to this folder. How to get this ListItem?

Resolution: In SharePoint Object model you can use SPFolder.Item property. But SCOM Folder doesn't have such prop. You need to use CAML query to get this item:

m_rootTrgUrl = web URL
mm_trgParentWebId = web ID
m_trgListId = existing list ID
srvRelativeURL = folder server-relative URL


using (var clientContext = new ClientContext(m_rootTrgUrl))
{
var trgWeb = clientContext.Site.OpenWebById(m_trgParentWebId);
var trgList = trgWeb.Lists.GetById(m_trgListId);
var query = new CamlQuery();
query.ViewXml = "<View Scope=\"RecursiveAll\"> " +
      "<Query>" +
   "<Where>" +
   "<And>" +
     "<Eq>" +
       "<FieldRef Name=\"FSObjType\" />" +
       "<Value Type=\"Integer\">1</Value>" +
     "</Eq>" +
     "<Eq>" +
       "<FieldRef Name=\"Title\"/>" +
       "<Value Type=\"Text\">" + folderName + "</Value>" +
     "</Eq>" +
   "</And>" +
   "</Where>" +
   "</Query>" +
   "</View>";

query.FolderServerRelativeUrl = srvRelativeURL;

var folderItems = trgList.GetItems(query);

clientContext.Load(trgList);
clientContext.Load(folderItems);
clientContext.ExecuteQuery();

switch (folderItems.Count)
{
 // process query result
}
}