How to assign a dynamic resource style in code?

Question

I want to produce in code the equivalent of this in XAML:

<TextBlock
Text="Title:"
Width="{Binding FormLabelColumnWidth}"
Style="{DynamicResource FormLabelStyle}"/>

I can do the text and the width, but how do I assign the dynamic resource to the style:

TextBlock tb = new TextBlock();
            tb.Text = "Title:";
            tb.Width = FormLabelColumnWidth;
            tb.Style = ???

as others here have pointed out, the answer you marked as correct doesn't actually do what the question poses. There is another answer here that is. You should consider changing your answer accordingly because some people read the marked answer and nothing else and they will miss the correct info, which is what SO is all about. — Mark A. Donohoe, Sep 27 '15 at 08:02

score 220 · Answer 1 · edited Apr 23 '19 at 03:00

220

You should use FrameworkElement.SetResourceReference if you want true DynamicResource behaviour - ie updating of the target element when the resource changes.

tb.SetResourceReference(Control.StyleProperty, "FormLabelStyle")

edited Apr 23 '19 at 03:00

John Cummings

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answered Nov 18 '09 at 09:13

Samuel Jack

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If you're dealing with nested dictionaries this is definitely the way to go! – Oskar Henriksson Jul 08 '20 at 12:02

score 38 · Accepted Answer · answered Nov 18 '09 at 09:10

38

You can try:

tb.Style = (Style)FindResource("FormLabelStyle");

Enjoy!

answered Nov 18 '09 at 09:10

Alastair Pitts

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The answer von Samuel is better, since it is the equivalent of {DynamicResource} in XAML, while your answer changes tb.Style to the current value of the resource "FormLabelStyle". tb.Style does not change when the resource "FormLabelStyle" changes, though. – Daniel Albuschat Jul 05 '13 at 07:23
2

This is better if you are sure the resource will not change after this assignment. – Huseyin Yagli Mar 26 '18 at 08:42

score 13 · Answer 3 · answered Nov 24 '18 at 23:36

The original question was how to make it Dynamic, which means if the resource changes the control will update. The best answer above used SetResourceReference. For the Xamarin framework this is not available but SetDynamicResource is and it does exactly what the original poster was asking. Simple example

        Label title = new Label();
        title.Text = "Title";
        title.SetDynamicResource(Label.TextColorProperty, "textColor");
        title.SetDynamicResource(Label.BackgroundColorProperty, "backgroundColor");

Now calling:

        App.Current.Resources["textColor"] = Color.AliceBlue;
        App.Current.Resources["backgroundColor"] = Color.BlueViolet;

Causes the properties to change for all controls using the resource this way. This should work for any property.

score 3 · Answer 4 · edited Jul 04 '12 at 12:50

3

This should work:

tb.SetValue(Control.StyleProperty, "FormLabelStyle");

edited Jul 04 '12 at 12:50

answered Nov 18 '09 at 09:08

robert.oh.

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What's the difference between this method and `SetResourceReference`? – SepehrM Apr 30 '14 at 15:22
This is equivalent to `tb.Style = "FormLabelStyle"`. This is what the CLR wrapper does internally. – Palec Dec 11 '16 at 11:42
This throws an `ArgumentException`: `'FormLabelStyle' is not a valid value for property 'Style'.` If you use the equivalent `tb.Style = "FormLabelStyle";`, the semantics are the same (the CLR wrapper property calls the same code internally), but it fails in compile time because of strict type checking (which is good). – Palec Dec 11 '16 at 12:37

score 2 · Answer 5 · edited Jan 16 '20 at 11:03

2

Application.Current.Resources.TryGetValue("ResourceKey", out var value)

edited Jan 16 '20 at 11:03

sharkbait

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answered Jan 16 '20 at 05:27

Abdul Gani

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How to assign a dynamic resource style in code?

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