setting a Window DataContext to a property object of App

Question

I want to set in xaml, the DataContext of a window to a property object of App,
but I do not know how to configure the binding, I do not know the RelativeSource
of App to set in MainWindow.xaml

DataContext="{Binding RelativeSource=???? , Path=myAppProperty }"

and then use it, for example like this:

        <TextBlock Text="{Binding Path=myField}"/>

maybe, I should use another property of the binding instead of RelativeSource

could someone help?

Answer 1

Try two approaches:

<TextBlock Text="{Binding myAppProperty}" DataContext="{x:Static Application.Current}" . . .  />

<TextBlock Text="{Binding myAppProperty, Source={x:Static Application.Current}}"  . . . />

This assumes that App contains the corresponding property. A simple one is:

public string myAppProperty { get; set; } = "SomeText";