Invalid XAML error updating from WP7

We are now seeing the beginning of the fast decline of Windows Phone 7 as it exits the market over the next several months, many of you will need to act to update your app to at least Windows Phone 8.  I did this for all of my WP7 apps and there was one error that was In just about every upgrade:

An error on this XAML namespace declaration:

xmlns:controls="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone.Controls"

Previous to Windows Phone 8, the Pivot and Panorama controls were part of a toolkit. The Windows Phone team did a solid by included these in the OS, they also added new controls like the LongListSelector to replace the toolkit’s ListPicker . These controls are now found in the Phone namespace.

It’s a very frustrating problem if you’re seeing it for the first time. Don’t worry, there is a really easy fix… Delete the xmlns:controls line and use only the xmlns:phone one or edit it and remove the “.Contols” part of the assembly pointer. Here is what it will look like after doing the edit option:

xmlns:controls="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone"

However, in many newer app templates, this is already used for the xmlns:phone declaration that looks like this:


xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone"

If you do have the xmlns:phone declaraiton, simply delete the bad line xmlns:controls line and change any UI controls on the page to use the phone one instead. For example

Change:

<controls:Pivot x:Name="MyPivot"> foo </controls:Pivot>

to

<phone:Pivot x:Name="MyPivot"> foo </phone:Pivot>

I hope this blog post was found when you searched for the error and it fixed it for you 🙂 Let me know if this doesn’t fix it for you and I’ll take a look at your XAML.

Happy coding!

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