The exercise is to let you get familiar with loading images in C#.

? Create a folder, and place at least three images in it.

? Use project Example Set2.zip/Playland as a starting point, make a simple photo viewer, which contains a button that can be used to scroll through the images in the folder. When you reached the last image in the folder, the next image to be displayed should be the first image in the folder.

? You may place the image folder at the same location as the executables (for example: bin/Debug/Images), so it will be included in the submission. Hardcode the directory path is Ok for this exercise.

MainWindow.xaml:

MainWindow.xaml.cs:

using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Windows; using System.Windows.Controls; using System.Windows.Data; using System.Windows.Documents; using System.Windows.Input; using System.Windows.Media; using System.Windows.Media.Imaging; using System.Windows.Navigation; using System.Windows.Shapes; using System.Windows.Forms;

using System.IO;

// image came from: // http://www.iconseeker.com/png/art-toys/blue-toy.html

namespace Playland { ///

/// Interaction logic for MainWindow.xaml ///

public partial class MainWindow : Window { public MainWindow() { InitializeComponent();

Image myImage = new Image(); myImage.Width = 128; string path = System.IO.Path.Combine(Environment.CurrentDirectory, @"blue-toy.png"); // Create source BitmapImage myBitmapImage = new BitmapImage(); //BitmapImage myBitmapImage = new BitmapImage( new Uri (path));

// BitmapImage.UriSource must be in a BeginInit/EndInit block myBitmapImage.BeginInit();

//// Path.Combine requires using System.IO //// http://stackoverflow.com/questions/5560653/image-source-does-not-locate-image-file-in-working-directory //// "The problem is that without the full path, WPF assumes it is a relative path to an embedded resource, not a file on disk." //string path = System.IO.Path.Combine(Environment.CurrentDirectory, @"blue-toy.png"); //// If you remove System.IO you can experience the issue of a conflict between the same named thing in two different name spaces. //// For use of @"" see: http://msdn.microsoft.com/en-us/library/vstudio/362314fe.aspx

myBitmapImage.UriSource = new Uri(path);

//// To save significant application memory, set the DecodePixelWidth or //// DecodePixelHeight of the BitmapImage value of the image source to the desired //// height or width of the rendered image. If you don't do this, the application will //// cache the image as though it were rendered as its normal size rather then just //// the size that is displayed. //// Note: In order to preserve aspect ratio, set DecodePixelWidth //// or DecodePixelHeight but not both. myBitmapImage.DecodePixelWidth = 128; myBitmapImage.EndInit(); //set image source myImage.Source = myBitmapImage;

canvas1.Children.Add(myImage); Canvas.SetLeft(myImage, 150); } } }