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To reduce the amount of data transferred from server to client, you can specify precisely the properties you want to be populated with data. Listings 12 29 and 12 30 both return only the Url and Id properties of the Site object and the Title property of the Web object. Listing 12 29. Retrieving Only Some Site and Web Properties (C#) public void Example06() { ClientContext ctx = new ClientContext("http://clserver"); Site oSite = ctx.Site; Web oWeb = ctx.Web; ctx.Load(oSite, s => s.Id, s => s.Url); ctx.Load(oWeb, w => w.Title); ctx.ExecuteQuery(); Console.WriteLine("Site-ID: " + oSite.Id + "\r\nSite-URL: " + oSite.Url + "\r\nWeb-Title: " + oWeb.Title); } The console output of Listing 12 29 looks like this: Site-ID: ff845efa-f800-41ec-8349-d26d3fb4063b Site-URL: http://clserver Web-Title: SharePoint 2010 Book Project Instead of lambda expressions, with JavaScript you have to define the properties as function parameters, as shown in Listing 12 30.

Listing 12 30. Retrieving Only Some Site and Web Properties (JavaScript) function example06() { var ctx = new SP.ClientContext.get_current(); this.site = ctx.get_site(); this.web = ctx.get_web(); ctx.load(this.site, "Id", "Url"); ctx.load(this.web, "Title"); ctx.executeQueryAsync( Function.createDelegate(this, this.onSucceededCallback), Function.createDelegate(this, this.onFailedCallback)); } function onSucceededCallback(sender, args) { alert('Site-ID: ' + this.site.get_id() + '\r\nSite-URL: ' + this.site.get_url() + '\r\nWeb-Title: ' + this.web.get_title()); } The resulting alert box for Listing 12 30 is shown in Figure 12 19.

SMPTETimeCode = TimeCode.FromTicks(MediaSource.Position.Ticks, TimeCode.ParseFrameRate(FrameRate)).ToString(); } //plug into the thumb to pause play while it is being dragged void HorizontalThumb_DragStarted(object sender, DragStartedEventArgs e) { if (MediaSource != null && MediaSource.CurrentState == MediaElementState.Playing) MediaSource.Pause(); } void HorizontalThumb_DragCompleted(object sender, DragCompletedEventArgs e) { if (MediaSource != null) { MediaSource.Position = new TimeSpan(0, 0, 0, 0,

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Modifying the properties of a web site or another client object is similar to retrieving data. Instead of using the Load or LoadQuery methods, you call the Update method. After that, remember that the modification will not be sent back to the server until ExecuteQuery or ExecuteQueryAsync is executed (see Listings 12 31 and 12 32). Listing 12 31. Updating Web Site Properties (C#) public void Example07() { ClientContext ctx = new ClientContext("http://clserver/blog"); Web oWeb = ctx.Web; oWeb.Title = "This is a new title"; oWeb.Description = "This is a new description"; oWeb.Update(); ctx.ExecuteQuery(); }

(int)(this.Value * MediaSource.NaturalDuration.TimeSpan.TotalMilliseconds / (this.Maximum - this.Minimum))); } MediaSource.Play(); } //media element download progress changed private void MediaSource_DownloadProgressChanged(object sender, RoutedEventArgs e) { if (elemDownloadProgressIndicator != null) { elemDownloadProgressIndicator.Width = (MediaSource.DownloadProgress * this.ActualWidth); if (textDownloadPercent != null) textDownloadPercent.Text = string.Format("{0:##.##} %", MediaSource.DownloadProgress * 100); } } //state changes on the MediaElement private void MediaSource_CurrentStateChanged(object sender, RoutedEventArgs e) { switch (MediaSource.CurrentState) { case MediaElementState.Playing: if (textDuration != null) textDuration.Text = string.Format("{0:00}:{1:00}:{2:00}:{3:000}", MediaSource.NaturalDuration.TimeSpan.Hours, MediaSource.NaturalDuration.TimeSpan.Minutes, MediaSource.NaturalDuration.TimeSpan.Seconds, MediaSource.NaturalDuration.TimeSpan.Milliseconds); if (disptimerPlayProgressUpdate.IsEnabled == false) disptimerPlayProgressUpdate.Start(); break; case MediaElementState.Paused: if (disptimerPlayProgressUpdate.IsEnabled) disptimerPlayProgressUpdate.Stop(); break; case MediaElementState.Stopped: if (disptimerPlayProgressUpdate.IsEnabled) disptimerPlayProgressUpdate.Stop(); break;

Listing 12 32. Updating Web Site Properties (JavaScript) function example07() { var ctx = new SP.ClientContext.get_current(); this.web = ctx.get_web(); this.web.set_title("This is a new title"); this.web.set_description("This is a new description"); this.web.update(); ctx.executeQueryAsync( Function.createDelegate(this, this.onSucceededCallback), Function.createDelegate(this, this.onFailedCallback)); }

To create a new web site, you need a client object called WebCreationInformation that contains a set of properties for the new web site. Listing 12 33 creates a new team site using the team site web template STS#0. Listing 12 33. Creating a New Web Site (C#) public void Example08() { string siteUrl = "http://clserver"; string tsDescription = "A new Team site."; int tsLanguage = 1033; string tsTitle = "Team Site"; string tsUrl = "teamSite"; bool tsInheritPermissions = false; string webTemplate = "STS#0"; ClientContext ctx = new ClientContext(siteUrl); Web oWebsite = ctx.Web; WebCreationInformation webCreateInfo = new WebCreationInformation(); webCreateInfo.Description = tsDescription; webCreateInfo.Language = tsLanguage; webCreateInfo.Title = tsTitle; webCreateInfo.Url = tsUrl; webCreateInfo.UseSamePermissionsAsParentSite = tsInheritPermissions; webCreateInfo.WebTemplate = webTemplate; Web oNewWeb = oWebsite.Webs.Add(webCreateInfo); ctx.Load(oNewWeb, website => website.ServerRelativeUrl, website => website.Created); ctx.ExecuteQuery();

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