Note: This article is submitted by Jeff Paries for Silverlight: Write and Win contest.Thanks a lot, Jeff! Hello All, Please drop a comment if you like it.

This article is compatible with the latest version of Silverlight.

Introduction

There have been many requests online regarding methods to go about sending content to a user from within a Silverlight application. Many Silverlight users have asked for a “Save File” dialog that can be leveraged to pass files out of an application. The technique described in this tutorial shows how you can leverage a standard HTML right-click dialog to allow a user to select the “Save Link/Target As” menu and pass any type of file from any type of object to the user, allowing them to save the file to any location they wish.

This article is compatible with the latest version of Silverlight.

Introduction

Silverlight helps for creating Rich Internet Applications (RIAs). It runs in the context of the browser. There is an isolated area, called sandbox, which holds the Silverlight application. But why is it necessary to restrict the Silverlight applications in such a way? The answer of this question is pretty simple - because of the security. Running such applications locally is dangerous. They may damage your computer or your data. So, there is a necessity to somehow restrict them. Thus, a Silverlight application runs in the sandbox.

In order to invoke a JavaScript function  we must access the DOM from the Silverlight application. This can be done with the help of the System.Windows.Browser.HtmlPage class. Here it is how it's done:

HtmlPage.Window.Invoke( "Function_Name", new object[] { //Array of paramaters that must be passed to the function } );

We call the Invoke method of the Window property, which takes the name of the function and an array of its arguments as parameters.

That's it!

This article is compatible with the latest version of Silverlight.

This tip is about adjusting the size of the Silverlight object in the Html to the size of the content in our Silverlight application. The example I will use will manipulate only the height, because the width can be manipulated in analogical way.

Let's start with explanation of how we're going to access the Silverlight object in the HTML. We use the HtmlPage object in the codebehind. With its help we invoke a javascript function, which will deal with Silverlight object in the mark up:

private void ResizeSilverlightOnject( double height )

{

    HtmlPage.Window.Invoke( "ResizeObject", new object[] { height } );

}