Can't add the converter while binding

Question

I've implemented the interface IValueConverter as shown here and I put it for now in the same file as my code-behind to the XAML (two classes, both in the same namespace but implementing IValueConverter and inheriting Window ).

public class BamseGurka : IValueConverter
{
  public object Convert(object v, Type t, object p, CultureInfo c) { ... }
  public object ConvertBack(object v, Type t, object p, CultureInfo c) { ... }
}

In XAML I added a label, the visibility of which is bound to the outcome that need to be converted, as shown here - "how to use value converter in XAML" .

<Label Name="ErrorMessage" ...
       Visibility="{Binding Converter={StaticResource BamseConverter}}" >

Since I'll want to use a really custom converter and not one that's been forseen by Microsoft (no booleans, integers or such), I need to refer my implementation (as opposed to eg BoolToVisibilityConverter ). I hoped that the intellisense would give me good suggestion on the matter but I ended up in adding a resource to the parent element (or window, or application) like so.

<StackPanel.Resources>
  <ComboCellBindingConverter x:Key="BamseConverter" />
</StackPanel.Resources>

And this raises two issues - first of all why do I get (and what is) ComboCellBindingConverter . And secondly, what am I supposed to put there instead (since that symbol can't be resolved and I need to point to my implementation anyway)?

Being sneaky, I tried to circumvent as follows but that only led to the same error.

<StackPanel.Resources>
  <BamseGurka x:Key="BamseConverter" />
</StackPanel.Resources>

Using the intellisense, I arrived at a new attribute in the window tag and the following setup.

xmlns:blopp="clr-namespace:The.Actual.Namespace" ...

<StackPanel.Resources>
  <blopp:BamseGurka x:Key="BamseConverter" />
</StackPanel.Resources>

Now, it complains about BamseGurka not being in the mentioned namespace, which is a bold lie because it is! And just for fun, when I switched BamseGurka for the name of the original class (the other one in the same file, remember?), the error was gone.

So I'm kind of at a loss here. Haven't used custom converters like this before. Suggestions? Google gave me a lot to go on if DataContext is null but nother better when it comes to converters.

Answer 1

For example if you put your converter to separate file located in "Converters" folder in root folder, you would register it in dictionary like that:

<ResourceDictionary
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:converters="clr-namespace:BamseGurka.Converters">

    <converters:BamseConverter x:Name="BamseConverter" />
</ResourceDictionary>

then you would just bind to it like you have done:

<Label Name="ErrorMessage" ...
       Visibility="{Binding Converter={StaticResource BamseConverter}}" >

of course, remember to set to what property you bind in Visibility, because for this moment it won't work.