从外部类访问XAML元素

Question

I made a switch on which the program should change all backgrounds of gieven elements. Therefore I made a new changer-class (View Model) which accesses every xaml file and changes the background color:

TheView1.xaml: (partial)

<ScrollView
    x:Name="myScrollView" [...]

TheView1.xaml.cs: (partial)

void switch_Toggled(object sender, ToggledEventArgs e)
    {
        if (themeSwitch.IsToggled)
        {
           ChangeBackground.ChangeColor();
        }
    }

ChangeBackgrounds.cs

public static class ChangeBackground
{
    TheView1 tv1 = new TheView1();
    public static void ChangeColor()
    {            
        tv1.myScrollView.BackgroundColor = [...];
        tv1.myButton.BackgroundColor = [...];
    }
}

VS then says "tv1 does not contain a definition for myScrollView and myButton". But they are clearly there, why does´nt it work?

Answer 1

If you are working with WPF try it with the MVVM Pattern and bind the background color.

I found an almost similar question here on stackoverflow: Change Button Background color through MVVM pattern in WPF