page_type	products	languages	extensions
sample	office-onedrive ms-graph	csharp	contentType technologies services createdDate samples Microsoft Graph OneDrive 2/21/2017 10:21:21 AM

Microsoft Graph OneDrive Photo Browser sample

The Microsoft Graph OneDrive Photo Browser sample is a Windows Universal app that uses the Microsoft Graph .NET Client Library for C#/.NET. The sample app displays only items that are images from a user's OneDrive. Note that this sample does not work with OneDrive for Business.

The sample uses the v2.0 authentication endpoint, which enables users to sign in with either their personal or work or school Microsoft accounts.

Set up

Prerequisites

To run the sample, you will need:

• Visual Studio 2015, with Universal Windows App Development Tools Note: If you don't have Universal Windows App Development Tools installed, open Control Panel | Uninstall a program. Then right-click Microsoft Visual Studio and click Change. Select Modify and then choose Universal Windows App Development Tools. Click Update. For more info about setting up your machine for Universal Windows Platform development, see Build UWP apps with Visual Studio.
• Windows 10 (development mode enabled)
• Either a Microsoft or Office 365 for business account.
• Knowledge of Windows Universal app development

Download the sample

1. Download the sample from GitHub by choosing Clone in Desktop or Download Zip.
2. In Visual Studio, open the OneDrivePhotoBrowser.sln file and build it.

##Register and configure the app

1. Sign into the App Registration Portal using either your personal or work or school account.
2. Select Add an app.
3. Enter a name for the app, and select Create application. The registration page displays, listing the properties of your app.
4. Under Platforms, select Add platform.
5. Select Mobile application.
6. Copy the Client Id (App Id) value to the clipboard. You'll need to use it in the sample app. The app id is a unique identifier for your app.
7. Select Save.

After you've loaded the solution in Visual Studio, configure the sample to use the Client Id that you registered by adding it as a key in the Application.Resources node of the App.xaml file.

    <x:String x:Key="ida:ClientID">your Client Id</x:String>

Run the sample

1. With the sample open in Visual Studio, at the top, select Debug for Solution Configurations and x86 or x64 for Solution Platforms, and OneDrivePhotoBrowser for Startup project.
2. Check that you are running the sample on the Local Machine.
3. Press F5 or click Start to run the sample.

The OneDrive Photo Browser sample app will open the signed-in user's personal OneDrive, with only folders and images displayed. If the file is not an image, it will not show up in the OneDrive Photo Browser app. Select a folder to see all images in that folder. Select an image to see a larger display of the image, with scroll view.

API features

MSAL sign-in

Users can log in with either a Microsoft or Office 365 for business account.

After the user signs in, the AuthenticationHelper class returns an MSAL GraphServicesClient.

        public static GraphServiceClient GetAuthenticatedClient()
        {
            if (graphClient == null)
            {
                // Create Microsoft Graph client.
                try
                {
                    graphClient = new GraphServiceClient(
                        "https://graph.microsoft.com/v1.0",
                        new DelegateAuthenticationProvider(
                            async (requestMessage) =>
                            {
                                var token = await GetTokenForUserAsync();
                                requestMessage.Headers.Authorization = new AuthenticationHeaderValue("bearer", token);
                                // This header has been added to identify our sample in the Microsoft Graph service.  If extracting this code for your project please remove.
                                requestMessage.Headers.Add("SampleID", "uwp-csharp-photobrowser-sample");

                            }));
                    return graphClient;
                }

                catch (Exception ex)
                {
                    Debug.WriteLine("Could not create a graph client: " + ex.Message);
                }
            }

            return graphClient;
        }

Get thumbnails for an image in OneDrive

In this example, thumbnails are returned for an item, if it is an image. GetAsync() is used to get the item's properties.

           IEnumerable<DriveItem> items;

            var expandString = "thumbnails, children($expand=thumbnails)";

            // If id isn't set, get the OneDrive root's photos and folders. Otherwise, get those for the specified item ID.
            // Also retrieve the thumbnails for each item if using a consumer client.
            var itemRequest = string.IsNullOrEmpty(id)
                ? this.graphClient.Me.Drive.Root.Request().Expand(expandString)
                : this.graphClient.Me.Drive.Items[id].Request().Expand(expandString);

            var item = await itemRequest.GetAsync();
            items = item.Children == null
                ? new List<DriveItem>()
                : item.Children.CurrentPage.Where(child => child.Folder != null || child.Image != null);

More resources

• Microsoft Graph .NET Client Library
• Windows Universal apps - More information about Windows Universal apps

License

License

This project has adopted the Microsoft Open Source Code of Conduct. For more information see the Code of Conduct FAQ or contact opencode@microsoft.com with any additional questions or comments.