Access variable in code-behind from Resources in UserControl

问题

I have the following problem: I want to access one of these three vars, defined in XAML Resource

<UserControl.Resources>
    <ResourceDictionary>
        <ResourceDictionary.MergedDictionaries>
            <ResourceDictionary Source="../../Themes/MainStyle.xaml" />
        </ResourceDictionary.MergedDictionaries>
        <System:Int32 x:Key="maxVal">500</System:Int32>
        <System:Int32 x:Key="minVal">250</System:Int32>
        <System:Int32 x:Key="actualWidth">250</System:Int32>
    </ResourceDictionary>
</UserControl.Resources>

I want to access the value of "actualWidth" from Codebehind file like this:

private void MinMaxGraphicsMessageSink(bool minmax)
{
   actualWidth = minmax ? 900 : 300;
}

But this doesn't work. Can someone help?

回答1:

int maxVal = (Convert.ToInt32(FindResource("maxVal")));

similarly min value

int minVal = (Convert.ToInt32(FindResource("minVal")));

to set value of a resource you can do like this

var resourceDictionary = this.Resources;
resourceDictionary["actualWidth"] = somevalue;

回答2:

I think you can use

var max = (int)Application.Resources["maxValue"];

or something similar.

回答3:

use like this

(int)this.FindResource("actualWidth")

来源：https://stackoverflow.com/questions/6017042/access-variable-in-code-behind-from-resources-in-usercontrol