WinJS application With Windows Runtime Component To Access Native C# Code

Let's get started.

Step 1:

Firstly, create a WinJS project as discussed in in my following article. For that we will start with creating a blank Universal Windows App:

Create you first WinJS Application

Step 2:

Now we will add a Windows Runtime Component. For this, go to File, Add, then click New Project.

Step 3:

Under Other Languages, Visual C#, then Windows, elect Windows Runtime Component (Windows 8.1). Name it WinRuntimes and click OK.

Step 4:

Delete the default class ‘Class1’ and add a new class Service by right click ing the WinRuntimes project and add new class.

Step 5:

Name this class as Service and click Add.

In Service Class, make Service as sealed class and add function Hello() which returns string “Hello World”.

Complete code snippet is:

  1. using System;  
  2. using System.Collections.Generic;  
  3. using System.Linq;  
  4. using System.Text;  
  5. using System.Threading.Tasks;  
  7. namespace WinRuntimes  
  8. {  
  9.     public sealed class Service  
  10.     {  
  11.         public string Hello()  
  12.         {  
  13.             return "Hello World";  
  14.         }  
  15.     }  

Step 6:

Now we have to add this WinRuntimes as reference in our WinJS project. Right Click on References > Add Reference.

Step 7:

Under Projects, Solution, then select WinRuntimes and Click OK.

You will see a reference added in our WinJS project. Build this project or press Ctrl + Shift + B.
Step 8:

Add a script.js file and reference it in HTML similarly discussed in previous article.

Let us add the following things in HTML.

  • Button with click event.
  • Input field

Our complete HTML looks like:
  1. <!DOCTYPE html>  
  2. <html>  
  3. <head>  
  4.     <meta charset="utf-8" />  
  5.     <title>Hello_WinJS</title>  
  7.     <!-- WinJS references -->  
  8.     <link href="//Microsoft.WinJS.2.0/css/ui-dark.css" rel="stylesheet" />  
  9.     <script src="//Microsoft.WinJS.2.0/js/base.js"></script>  
  10.     <script src="//Microsoft.WinJS.2.0/js/ui.js"></script>  
  12.     <!-- Hello_WinJS references -->  
  13.     <link href="/css/default.css" rel="stylesheet" />  
  14.     <script src="/js/default.js"></script>  
  15.     <script src="js/script.js"></script>  
  16. </head>  
  17. <body>  
  18.     <p>Hello WinJS</p>  
  19.     <button onclick="getString()">Click Me</button>  
  20.     <input id="txtInput"/>  
  21. </body>  
  22. </html> 

Step 9:

In script.js, we will add getString() function with a service object that calls the method Hello() of WinRuntimes (Windows Runtime Component) like:

  1. function getString() {  
  2.     var service = new WinRuntimes.Service();  
  3.     var message = service.hello();  
  4.     document.getElementById("txtInput").value = message;  

Step 10:

Now we are ready to run our application, Press F5 and click on Click Me button. You will see “Hello World” in the input field that is retrieved from native C# code using Windows Runtime Component.

In the coming articles, I will show you how to do asynchronous operations in Runtime Components.
That’s it.

Thanks! Happy Coding.

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