Passing through StaticResource style defined in XAML in C# codebehind

Question

I am building a WPF application. XAML used for front end and C# for code behind

I have the following section of code that generates my XAML for me dynamically.

if (station_item.Checker_Setup.First().Checker_Log.OrderByDescending(log => log.date).First().Status.status_key == 2) { Path path = new Path(); path.Data = new RectangleGeometry(new Rect(0, 0, 19, 21), 3, 3); path.Style = "{StaticResource statusIndicatorRed}"; TextBlock block = new TextBlock(); block.Text = station_item.station_name; WrapBox.Children.Add(path); WrapBox.Children.Add(block); }

However where I have

path.Style = "{StaticResource statusIndicatorRed}";

I get the following error

Cannot implicitly convert type String to System.Windows.Style

The style is defined in my MainWindow.xaml as follows

<Style x:Key="statusIndicatorRed" TargetType="Path"> <Setter Property="Fill" Value="#B2203D" /> <Setter Property="Width" Value="19px" /> <Setter Property="HorizontalAlignment" Value="Left" /> <Setter Property="ToolTipService.ShowDuration" Value="30000" /> <Setter Property="Cursor" Value="Help" /> </Style>

How would I pass this style through in my code behind? Is this even a good way to do things?

You would need to place the resource where your code-behind set up has access to it. For example path.Style = (Style)App.Current.Resources["statusIndicatorRed"]; if the resource is defined in App.xaml or in a ResourceDictionary referenced by App.Xaml. — Silvermind
– Silvermind, Commented Jul 4, 2014 at 9:53
Aha! I thought the issue could be that the code behind had no way of seeing where this style was defined. Thanks for the help I shall make the changes needed then. — ocajian
– ocajian, Commented Jul 4, 2014 at 9:56
@Silvermind would best practice be to define my style in a seperate file referenced by App.Xaml? — ocajian
– ocajian, Commented Jul 4, 2014 at 9:58
Yes, using seperate ResourceDictionaries to group styles is a good idea. — Silvermind
– Silvermind, Commented Jul 4, 2014 at 10:10

ocajian · Accepted Answer · 2014-07-04 10:13:19Z

This is what I did to fix the issue:

I created a new ResourceDictionary named Styles.xaml

In my App.xaml I referenced the resource as follows

<Application.Resources> <ResourceDictionary Source="Styles.xaml" /> </Application.Resources>

In my codebehind I called the resource as follows

path.Style = (Style)App.Current.Resources["statusIndicatorRed"];

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