SharePoint 2010 - Client Object Model - Add attachment to ListItem

Question

I have a SharePoint List to which I\'m adding new ListItems using the Client Object Model. Adding ListItems is not a problem and works great.

Now I want to add att

Answer 1

I've used and tried this one on my CSOM (SharePoint Client Object Model) application and it works for me

using (ClientContext context = new ClientContext("http://spsite2010"))
                {

                    context.Credentials = new NetworkCredential("admin", "password");
                    Web oWeb = context.Web;
                    List list = context.Web.Lists.GetByTitle("Tasks");
                    CamlQuery query = new CamlQuery();
                    query.ViewXml = "New Task Created";
                    ListItemCollection listItems = list.GetItems(query);
                    context.Load(listItems);
                    context.ExecuteQuery();
                    FileStream oFileStream = new FileStream(@"C:\\sample.txt", FileMode.Open);
                    string attachmentpath = "/Lists/Tasks/Attachments/" + listItems[listItems.Count - 1].Id + "/sample.txt";
                    Microsoft.SharePoint.Client.File.SaveBinaryDirect(context, attachmentpath, oFileStream, true);
                }

Note: Only works if item folder has been created already