Book Image

Windows Application Development Cookbook

By : Marcin Jamro
Book Image

Windows Application Development Cookbook

By: Marcin Jamro

Overview of this book

Need to ensure you can always create the best Windows apps regardless of platform? What you need are solutions to the biggest issues you can face, so you can always ensure you’re making the right choices and creating the best apps you can. The book starts with recipes that will help you set up the integrated development environment before you go ahead and design the user interface. You will learn how to use the MVVM design pattern together with data binding, as well as how to work with data in different file formats. Moving on, you will explore techniques to add animations and graphics to your application, and enable your solution to work with multimedia content. You will also see how to use sensors, such as an accelerometer and a compass, as well as obtain the current GPS location. You will make your application ready to work with Internet-based scenarios, such as composing e-mails or downloading files, before finally testing the project and submitting it to the Windows Store. By the end of the book, you will have a market-ready application compatible across different Windows devices, including smartphones, tablets, and desktops.
Table of Contents (11 chapters)

Choosing a file to open

In the previous examples, you have used files whose paths are defined directly in the code, either XAML or C#. However, sometimes it may be necessary to provide a user with the option of choosing a file to open. Of course, the suitable mechanism is available for UWP applications, as you will see in this recipe.

As an example, you will create a page with the Choose a file button. After clicking on it, the file picker will be presented, where a user can choose a particular file, restricting the options to .jpg files. When the operation is confirmed, the image is loaded and presented in the user interface.

Getting ready

To step through this recipe, you only need the automatically generated project.

How to do it...

To prepare an example that allows to present an image chosen by the user, perform the following steps:

  1. Add the Image control (where the chosen photo will be shown) and the button to the page by adjusting the content of the MainPage.xaml file, as follows:
      ...