What does “{x:Static}” mean in XAML?

It is a way to insert any static value into XAML. For example, if I have a class:

namespace A 
{ 
    public class MyConstants 
    {
        public static readonly string SomeConstantString = "BAM!";
    }
}

I can place it into a WPF UI using XAML like this:

<TextBlock Text="{x:Static A:MyConstants.SomeConstantString}" />

Notice, you will have to import the namespace in which MyConstants is defined into your XAML. So in the or element do something like:

xmlns:A="clr-namespace:A"

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