Create folder in Document Library using Sharepoint 2010 Client Object Model

Question

I would like to check for the existence of a folder in s Sharepoint 2010 Document Library and if the folder is not found, create it. (I would then subsequently programmatically upload documents to that folder -- which I have figured out). Can someone
please help me figure out how to check for the extistence of and then create a folder using the Sharepoint 2010 Client Object Model?

Answer 1

You can use this:
public static void CreateFolder_ClientOM(string listName, string folderName)
ClientContext clientContext = new ClientContext("http://basesmc2008");
Web web = clientContext.Web;
List list = clientContext.Web.Lists.GetByTitle(listName);
clientContext.Load(clientContext.Site);
string targetFolderUrl = listName + "/" + folderName;
Folder folder = web.GetFolderByServerRelativeUrl(targetFolderUrl);
clientContext.Load(folder);
bool exists = false;
try
clientContext.ExecuteQuery();
exists = true;
catch (Exception ex)
if (!exists)
ContentTypeCollection listContentTypes = list.ContentTypes;
clientContext.Load(listContentTypes, types => types.Include
(type => type.Id, type => type.Name,
type => type.Parent));
var result = clientContext.LoadQuery(listContentTypes.Where
(c => c.Name == "Folder"));
clientContext.ExecuteQuery();
ContentType folderContentType = result.FirstOrDefault();
ListItemCreationInformation newItemInfo = new ListItemCreationInformation();
newItemInfo.UnderlyingObjectType = FileSystemObjectType.Folder;
newItemInfo.LeafName = folderName;
ListItem newListItem = list.AddItem(newItemInfo);
newListItem["ContentTypeId"] = folderContentType.Id.ToString();
newListItem["Title"] = folderName;
newListItem.Update();
clientContext.Load(list);
clientContext.ExecuteQuery();
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