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Код


    public class FsItem
    {
        public string Name { get; set; }
        public bool IsDirectory { get; set; }
    }

    // Start the service and browse to http://<machine_name>:<port>/Service1/help to view the service's generated help page
    // NOTE: By default, a new instance of the service is created for each call; change the InstanceContextMode to Single if you want
    // a single instance of the service to process all calls.    
    [ServiceContract]
    [AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)]
    [ServiceBehavior(InstanceContextMode = InstanceContextMode.PerCall)]
    // NOTE: If the service is renamed, remember to update the global.asax.cs file
    public class Service1
    {
        // TODO: Implement the collection resource that will contain the SampleItem instances

        [WebGet(UriTemplate = "/?path={path}")]
        public List<FsItem> GetCollection(string path)
        {
            DirectoryInfo di = new DirectoryInfo(path);
            List<FsItem> rv = new List<FsItem>();
            
            rv.AddRange(di.GetFiles().Select(x => new FsItem() { Name = x.Name, IsDirectory = false }));
            rv.AddRange(di.GetDirectories().Select(x => new FsItem() { Name = x.Name, IsDirectory = true }));

            return rv;
        }

    }

Код


        private void ListBox_Loaded(object sender, RoutedEventArgs e)
        {
            ListBox lb = (ListBox)sender;
            string serviceBaseUrl = "http://localhost:3404/Service1/";
            string query = "?path=c:\temp";

            WebClient client = new WebClient();
            client.DownloadStringCompleted += new DownloadStringCompletedEventHandler(SearchRecipesByNameCompleted);
            client.DownloadStringAsync(new Uri(serviceBaseUrl + query, UriKind.Absolute));

        }

        void SearchRecipesByNameCompleted(object sender, DownloadStringCompletedEventArgs e)
        {
            XDocument xml = XDocument.Parse(e.Result);

            var dirInfoList = xml.Descendants("ArrayOfFsItem")
                .Nodes()
                .Select(node => ((XElement)node).Element("Name"));

            resultLB.ItemsSource = dirInfoList.ToList();
        }