CODEWITHSUNDEEP
c#wpfdynamicresource
nonForgivingJesus
nonForgivingJesus

Reputation: 593

WPF DynamicResource does not update anything

i have a problem that was asked here, but given solutions didn't help. I want to change background color of MainWindow's Grid from another window throught App global resources. The problem is, than i change backBrush dynamically, nothing happens. Moreover color initially is transparent. I tried different approaches of setting value in resources, like Application.Current.Resources["key"] = new_value and MainGrid.SetResourceReference(Grid.BackgroundProperty, "key") but nothing helps.

What am i doing wrong?

Apps resources looks like this:

<Application.Resources>
    <Color x:Key="backColor" R="255" G="0" B="255"/>
</Application.Resources>

Troubled part of MainWindow:

<Window.Resources>
        <SolidColorBrush x:Key="backBrush" Color="{DynamicResource backColor}"/>
    </Window.Resources>

    <Grid
        Name="MainGrid"
        Background="{DynamicResource backBrush}">

Code, corresponding to change in color:

this.Resources.Remove("backBrush");
this.Resources.Add("backBrush", 
                    new SolidColorBrush { Color = 
                        (Color)Application.Current.Resources["backColor"] });
MainGrid.SetResourceReference(Grid.BackgroundProperty, "backBrush");

I also tried set color like this:

Color newColor = (Color)Application.Current.Resources["backColor"];
Application.Current.Resources["backBrush"] = new SolidColorBrush { Color = newColor };

Upvotes: 2

Views: 1091

Answers (1)

Clemens
Clemens

Reputation: 128060

You forgot to set the Color's alpha value, which is zero by default:

<Application.Resources>
    <Color x:Key="backColor" R="255" G="0" B="255" A="255"/>
</Application.Resources>

Now you simply change the dynamic Brush resource by

Resources["backBrush"] = new SolidColorBrush(
    (Color)Application.Current.Resources["backColor"]);

Upvotes: 2

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