How to add ResourceDictionary programmatically?

Question

I'm new in C# WPF and only can rely on the internet to proceed my project. Currently, I have an issue on adding a ResourceDictionary name ThumbStyle.xaml that holds a few styles which needed to access in a class file named LineAdorner.cs.

Code from ThumbStyle.xaml:

<Style x:Key="LineMoveThumbStyle" TargetType="{x:Type Thumb}">
    <Setter Property="Cursor" Value="SizeAll"></Setter>
    <Setter Property="Width" Value="7"></Setter>
    <Setter Property="Height" Value="7"></Setter>
</Style>

<Style x:Key="LineResizeThumbStyle" TargetType="{x:Type Thumb}">
    <Setter Property="Width" Value="7"></Setter>
    <Setter Property="Height" Value="7"></Setter>
    <Setter Property="Cursor" Value="Hand"></Setter>
</Style>

Code from LineAdorner.cs:

this._moveThumb = new MoveThumb();
this._moveThumb.Style = (Style)Application.Current.FindResource("LineMoveThumbStyle");
this._visuals.Add(this._moveThumb);

this._startThumb = new LineStartPointThumb(_adornedLine);
this._startThumb.Style = (Style)Application.Current.FindResource("LineResizeThumbStyle");
this._visuals.Add(this._startThumb);

this._endThumb = new LineEndPointThumb(_adornedLine);
this._endThumb.Style = (Style)Application.Current.FindResource("LineResizeThumbStyle");
this._visuals.Add(this._endThumb);

As seen from above, I was attempted to use the "FindResource" method to retrieve the style from Thumbsytle.xaml into LineAdorner.cs. Yet The system throw me an error:

System.Windows.ResourceReferenceKeyNotFoundException occurred.
Message='LineMoveThumbStyle' resource not found.

Are there some steps I'm missing? Hope that anyone can help me out with this problem. Thank you very much.

Which resource dictionary is your LineResizeThumbStyle has been added to? Might find the ans here: https://stackoverflow.com/questions/618648/how-can-i-access-resourcedictionary-in-wpf-from-c-sharp-code — peeyush singh, Mar 08 '19 at 03:05
I guess the `ThumbStyle.xaml` is not merged into the available Resources of the `LineAdorner.cs`. You can add it similar to this: `ResourceDictionary r = new ResourceDictionary(); r.Source = new Uri("Uri/To/your/xaml"); Application.Current.Resources.MergedDictionaries.Add(r);` — LittleBit, Mar 08 '19 at 07:12
Why do you want to add the resource dictionary programmatically instead of referencing it in the app.xaml resources? — grek40, Mar 08 '19 at 07:26
Silly me.. Thank you all for your kind assistance.. in the end I noticed that I didnt add them into the app.xaml resources.. Shout out to @grek40 for reminding.. thanks mate — Ryan Gan, Mar 09 '19 at 14:37

score 4 · Answer 1 · answered Jan 06 '20 at 05:07

4

Application.Current.Resources.MergedDictionaries.Add(new ResourceDictionary
{
Source = new Uri("/DLLName;component/subFolder/dictionary.xaml", UriKind.RelativeOrAbsolute)
});

answered Jan 06 '20 at 05:07

Logikoz

61
1
4

score 1 · Answer 2 · answered Mar 08 '19 at 10:14

I don't quite get what you are trying to do, but will this help you? First, put your resource in a folder name Resources and then:

            var rsrc = "Resources/ThumbStyle.xaml";
            var currentRsrc = new Uri(rsrc, UriKind.RelativeOrAbsolute);
            Application.Current.Resources.MergedDictionaries[0] = new ResourceDictionary() { Source = currentRsrc };

Good luck!

How to add ResourceDictionary programmatically?

2 Answers2

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