Silverlight 4 now supports printing functionality using the Printing APIs. Using the APIs, you can now print your whole application screen or a portion of the application. Also, you can customize the look while you printing your part/full application.
In this post, I will step you guys to the depth of the printing API. Don’t forget to share your thoughts. Suggestions are always welcome. This will help me to improve my articles.
Begin with XAML Design
Let us start with a new blank Silverlight application project. Open Visual Studio 2010 and click on File –> New –> Project or just press CTRL + SHIFT + N to open up the new project dialog. Now expand the “Visual C#” section and select “Silverlight”. From the right pane, select “Silverlight Application”, choose the location to create the project and give a proper name (here I am using “
Silverlight4.PrintingAPI.Demo” as the project name). Click “OK” which will bring up another dialog. Select “Silverlight 4” & hit OK to create the blank Silverlight application.
Visual Studio will automatically create a “MainPage.xaml” for you and display inside your Visual Studio IDE. You can now design your application as per your need. Let us add some contents inside the page:
Here I am adding a “
Border”, a “
TextBlock” a “
ProgressBar” and a “
Button” inside the main Grid panel “
LayoutRoot” inside the “MainPage.xaml”. We will start our printing job once we click on the button. Hence, added the Click event with the button.
Here is the full XAML inside the UserControl/Page:
If you run your application now, it will look similar to this:
Begin with Code
This is all about the design part of our sample application. If you run your application now & click the button, it will not do anything for you. You may ask “Why?” and answer is we didn’t write any code for the printing. So, let’s jump to that section. Let us write the code for printing this page from the Silverlight application when we press the button. As we already registered the
Click_Event to the button, you will find the event implementation inside the code behind file “MainPage.xaml.cs”. Write the following code inside that to create the
PrintDocument and ask the browser to print your application:
Now, run your application & once it opens inside the browser, click on the “Print” button. If you have already installed a printer to your PC, you will notice that the Printer option page opens up in your desktop. Select the desired printer of your choice & click “Print”. This will print your entire application.
So what next? Can we print a small portion of the application? The answer is “Yes, why not?” Let's do a small trick to print a small portion. Ready to go? Hmmm… Open your XAML file “MainPage.xaml”. You will see that there is a
Canvas inside the
Grid which contains the
textblock and the
button is set outside the
Canvas named “
cnvContainer”. Let us print only the canvas part of the application. Go to your “MainPage.xaml.cs” file and modify the click event implementation. The latest code will look like this:
If you look into the implementation, you will see that I have modified the
PrintPage implementation only. Earlier the
PageVisual was set to grid “
LayoutRoot” and now it has been changed to canvas “
cnvContainer”. Run your application & click on the Print button. The same print option will popup. Select your printer and click print again. This will print only the portion we had selected in the
PageVisual. If you recall the previous printed page, there was a button inside the page but now it is not there. Why? Because our
cnvContainer which we selected for the printing doesn’t contain the “Print” button.
I think, this will give you an idea of the printing functionality of Silverlight 4 and now you can proceed to include the same inside your application. You can customize the print view as per your need. This will be beneficial to print out the “Admit Card”, “User entered text”, etc. from your Silverlight application.