Static class as resource for xaml in wpf

I try to use a static class as ResourceDirectory with StaticResources but it dont works.

Class:

  static class GlobalDefinitions
    {
        public const string Parameter = "Parameter";
    }

View:

xmlns:global="clr-namespace:Project.Global"

 <DataGridTextColumn Header="{Binding Source={global:GlobalDefinitions,Path=Parameter}"/>

Does anyone know why?

I try to use a static class as ResourceDirectory with StaticResources but it dont works.

Use the x:Static markup extension:

<DataGridTextColumn
    Header="{Binding Source={x:Static global:GlobalDefinitions.Parameter}}"/>

I will typically declare my class as a resource...

Given a class:

public class MyClass
{
  // 
}

Declare the resource (this is how it would look in App.xaml):

<Application.Resources>
  <ResourceDictionary>
      <myNamespace:MyClass x:Key="MyClass" />
  </ResourceDictionary>
</Application.Resources>

Then you can use it as a binding source e.g.:

<Window 
    DataContext="{Binding Source={StaticResource MyCLass}}"
    >
</Window> 

WPF will create an instance of the class as needed to resolve the binding. For this approach to work, the class must have a parameterless constructor.

The class "Locator" pattern works this way; you could have underlying static members, but they would need to be wrapped by instance members.