Question

I’m using SharePoint web services in C#. I have my code working to check files and check them out using the Lists web service. I need to test to see if a file exists; I can find lots of examples for doing this using the object model API, but I can’t seem to find a straightforward way of doing this using web services.

Answer 1

This code may do, it’s a little rough, but demonstrates how to get a list of files based on the title.

        public static bool PageExists(string listName, string webPath, string pageTitle)         {             string pageId = '';             IntranetLists.Lists lists = new IntranetLists.Lists();             lists.UseDefaultCredentials = true;             lists.Url = webPath + '/_vti_bin/lists.asmx';             XmlDocument doc = new XmlDocument();             doc.LoadXml('<Document><Query><Where><Contains><FieldRef Name=\'Title\' /><Value Type=\'Text\'>' + pageTitle + '</Value></Contains></Where></Query><ViewFields /><QueryOptions /></Document>');             XmlNode listQuery = doc.SelectSingleNode('//Query');             XmlNode listViewFields = doc.SelectSingleNode('//ViewFields');             XmlNode listQueryOptions = doc.SelectSingleNode('//QueryOptions');              Guid g = GetWebID(webPath);              XmlNode items = lists.GetListItems(listName, string.Empty, listQuery, listViewFields, string.Empty, listQueryOptions, g.ToString());              }             return items.Count > 0;                     }          public static XmlNodeList XpathQuery(XmlNode xmlToQuery, string xPathQuery)         {             XmlDocument doc = new XmlDocument();             doc.LoadXml(xmlToQuery.OuterXml);             XmlNamespaceManager mg = new XmlNamespaceManager(doc.NameTable);             mg.AddNamespace('sp', 'http://schemas.microsoft.com/sharepoint/soap/');             mg.AddNamespace('z', '#RowsetSchema');                                                mg.AddNamespace('rs', 'urn:schemas-microsoft-com:rowset');             mg.AddNamespace('y', 'http://schemas.microsoft.com/sharepoint/soap/ois');             mg.AddNamespace('w', 'http://schemas.microsoft.com/WebPart/v2');             mg.AddNamespace('d', 'http://schemas.microsoft.com/sharepoint/soap/directory');             return doc.SelectNodes(xPathQuery, mg);         }