WPF - Confusion with namespaces and "odd" errors

Question

I've been trying to get my head around XAML and it's namespaces and I just cannot seem to get the logics of things. For example, I'm trying to animate a gridrow's GridLength property following a tutorial. I can get the sample code to run just fine. But trying to actually port the features into my own code seems to be impossible. I always run into odd errors which doesn't occur in the source code. Animating the GridLength property isn't possible, so I need to create a new .vb file containing the code making it possible.

But trying to actually reach what's in there I can't get to work.

In my Window.xaml file I have this at the top:

xmlns:gridanim="clr-namespace:HDI_WPF_GridAnimation_vb"

Which targets a GridLengthAnimation.vb file. In that file you have this:

Imports System.Windows.Media.Animation
Imports System.Windows

Public Class GridLengthAnimation
    Inherits AnimationTimeline

Back in the Window.xaml, getting contact with "GridLengthAnimation" is impossible:

<gridanim:GridLengthAnimation></gridanim:GridLengthAnimation>

I get an error message saying:

The name "GridLengthAnimation" does not exist in the namespace "clr-namespace:HDI_WPF_GridAnimation_vb".

What is causing the issue?

Answer 1

I dont see your nameSpace declaration around your class

  Imports System.Windows.Media.Animation
  Imports System.Windows
  Namespace HDI_WPF_GridAnimation_vb
   Public Class GridLengthAnimation
      Inherits AnimationTimeline