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

Kishor Bikram Oli
8y
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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:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace WinRuntimes
{
public sealed class Service
{
public string Hello()
{
return "Hello World";
}
}
}

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:

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>Hello_WinJS</title>
<link href="//Microsoft.WinJS.2.0/css/ui-dark.css" rel="stylesheet" />
<script src="//Microsoft.WinJS.2.0/js/base.js"></script>
<script src="//Microsoft.WinJS.2.0/js/ui.js"></script>
<link href="/css/default.css" rel="stylesheet" />
<script src="/js/default.js"></script>
<script src="js/script.js"></script>
</head>
<body>
<p>Hello WinJS</p>
<button onclick="getString()">Click Me</button>
<input id="txtInput"/>
</body>
</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:

function getString() {
var service = new WinRuntimes.Service();
var message = service.hello();
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.

Read more articles on Universal Windows Apps:

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