Set value in xaml using class field - wpf

Question

I have a DataGrid as:
<DataGrid Grid.Row="4" Name="grvAllCry" Margin="5,5,5,5" ItemsSource="{Binding}" AutoGenerateColumns="False">
<DataGrid.Columns>
<DataGridTemplateColumn Header="Rank" Width="10*" >
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<Label Content="{Binding Rank}" Foreground="#46BF6E"></Label>
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
</DataGrid.Columns>
</DataGrid>
As you can see, I set Foreground of row of DataGrid is "#46BF6E". But I have many DataGrid and I want to re-use this variables. Something like:
public static class Config
{
public static string MyGreen = "#46BF6E";
public static string MyRed = "#D14836";
public static string MyBlue = "#428BCA";
}
Is there a way I can create a class like that and use it's variable in many different xaml files? For examples:
<Label Content="{Binding Rank}" Foreground="MyGreen"></Label>
I dont know how to call variable from .cs file while in xaml file, pls help me.

Answer 1

You could create a new ResourceDictionary where you define a Brush resource:
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<SolidColorBrush x:Key="myBrush" Color="#46BF6E"/>
</ResourceDictionary>
If you want to be able to reference this resource throughout your entire application, you can then merge this resource dictionary into your App.xaml:
<Application x:Class="WpfApp1.App"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
StartupUri="MainWindow.xaml">
<Application.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="Dictionary1.xaml" />
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Application.Resources>
</Application>
...and reference the resource from any view using the StaticResource markup extension:
<Label Content="{Binding Rank}" Foreground="{StaticResource myBrush}"></Label>

Answer 2

it is possible to referense static property or field (including const fields) using {x:Static ...} extension. For Config class it should be:
<Label Content="{Binding Rank}" Foreground="{x:Static myNameSpace:Config.MyGreen}"/>
xaml file should include namespace definition of Config class (xmlsns:myNameSpace="....")
However, reusable elements are usually defined as Resources. Resources which are visible across the application are defined in App.xaml:
<Application.Resources>
<SolidColorBrush x:Key="MyGreen" Color="#46BF6E"/>
<SolidColorBrush x:Key="MyRed" Color="#D14836"/>
<SolidColorBrush x:Key="MyBlue" Color="#428BCA"/>
</Application.Resources>
such resources can be used from StaticResource/DynamicResource extension:
<Label Content="{Binding Rank}" Foreground="{StaticResource MyGreen}"/>