“Dialogs must be user-initiated.” with SaveFileDialog in Silverlight 3

Question

I am working on a Silverlight 3 app with C#. I would like to allow the user to download an image from the Silverlight app. I am using SaveFileDialog to perform the file down

Answer 1

What this error message means is that you can only show a SaveFileDialog in response to a user initiated event, such as a button click. In the example you describe, you are not showing SaveFileDialog in response to a click, but rather in response to a completed http request (which is not considered a user initiated event). So, what you need to do to get this to work is, in the Completed event of the http request, show some UI to the user saying "download completed, click here to save the file to your computer", and when the user clicks on this message, display the SaveFileDialog.