resource dictionary null brush

Question

I am trying to have to "skin" resource dictionaries for a wpf application that I would like to be able to switch between. I want to be able to set the background property of several user controls to a key that is a solidcolorbrush in one dictionary and null in the other.

How do I make a resource value that is null? The following doesn't seem to work.

<SolidColorBrush x:Key="ticketBodyBG">{x:Null}</SolidColorBrush>

Is there a way to do this, or should I just use a transparent brush key?

No, I just wanted to know if setting it to null was a possibility. Since transparent black is roughly equivalent, its not a big deal. I just wanted to know. — Kyeotic, Oct 26 '11 at 16:49
I see, but I think you need to catch the difference between null and transparent, which you may or may not know. Please refere to [{x:Null} vs. Transparent?](http://stackoverflow.com/questions/5344699/xnull-vs-transparent) — Jin-Wook Chung, Oct 26 '11 at 17:03

score 1 · Accepted Answer · edited Oct 25 '13 at 18:32

1

You can't set to null value, simply left the Brush empty, it will automatically will set to Transparent like this -

<SolidColorBrush x:Key="ticketBodyBG"></SolidColorBrush>

edited Oct 25 '13 at 18:32

Dave Clemmer

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answered Oct 26 '11 at 16:34

Rohit Vats

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Default value will be empty if no color value is provided to Brush. – Rohit Vats Oct 26 '11 at 16:40

score 0 · Answer 2 · edited Oct 25 '13 at 18:31

0

Try:

<SolidColorBrush x:Key="ticketBodyBG" Color="#00000000"/>

It is equivalent to a null background (but is different from transparent i.e: the UIElement will not respond to hit testing)

edited Oct 25 '13 at 18:31

Dave Clemmer

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answered Oct 26 '11 at 16:24

Louis Kottmann

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Throws an exception: {"'' is not a valid value for property 'Color'."} – Kyeotic Oct 26 '11 at 16:26
This is still a transparent brush. – Kyeotic Oct 26 '11 at 16:42
No, transparent brush is #00ffffff. WPF treats it differently – Louis Kottmann Oct 26 '11 at 16:44
Those are both transparent. #00000000 is transparent black, #00ffffff is transparent white. I know they are treated differenly, but they are still transparent brushes. – Kyeotic Oct 26 '11 at 16:46

resource dictionary null brush

2 Answers2