I'm having trouble referencing a xaml resource dictionary file, leading to a runtime error saying 'resource x can't be found' when referring to a ResourceDictionary inside of . But using the Window.Resources node instead works.
working code:
<Window.Resources>
<ResourceDictionary Source="Resources\Template_1.xaml">
</ResourceDictionary>
</Window.Resources>
my malfunctioning code:
<Application.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="Resources\Template_1.xaml"/>
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Application.Resources>
My problem is I need the dictionary in application scope.
I'm accessing it as StaticResource and the build action of Template_1 is set as 'Page'
Any suggestions?
Edit:
this is the structure of Template_1.xaml
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:self="clr-namespace:Application_1"
>
<ControlTemplate x:Key="dict_TabContent" x:Shared="true" >
<DockPanel>
...
</DockPanel>
</ControlTemplate>
</ResourceDictionary>
Related
I have a Styles.xaml that groups many ResourceDictionarys inside a MergedDictionary.
I imported Styles.xaml in my UserControl.Resources
<UserControl.Resources>
<ResourceDictionary Source="Dictionaries\Styles.xaml" />
</UserControl.Resources>
but when I try to add a converter
<UserControl.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="Dictionaries\Styles.xaml" /> <--! Exception -->
</ResourceDictionary.MergedDictionaries>
<BooleanToVisibilityConverter x:Key="BooleanToVisibilityConverter"/>
</ResourceDictionary>
</UserControl.Resources>
it raises
ArgumentNullException: Value cannot be null.
Parameter name: item
Wrapping the converter inside another MergedDictionary has no effect.
How can I solve this?
Thank you all!
SOLVED
I eventually figured it out: the Exception was raised inside one the .xaml files, but Visual Studio does not provide enough info to locate the faulty line.
Following code does work.
<UserControl.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="Dictionaries\Styles.xaml" />
</ResourceDictionary.MergedDictionaries>
<BooleanToVisibilityConverter x:Key="BooleanToVisibilityConverter"/>
</ResourceDictionary>
</UserControl.Resources>
Try this
<UserControl.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="pack://application:,,,/PROJECTNAMESPACE (TestProject.Something);component/Dictionaries/Styles.xaml" />
</ResourceDictionary.MergedDictionaries>
<BooleanToVisibilityConverter x:Key="BooleanToVisibilityConverter"/>
</ResourceDictionary>
</UserControl.Resources>
File app.xaml
<Application.Resources>
<ResourceDictionary>
<SolidColorBrush x:Key="appBrush" Color="Red"/>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="Dictionary1.xaml"/>
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Application.Resources>
File Dictionary1.xaml
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<ControlTemplate x:Key="ct">
<Rectangle Fill="{StaticResource appBrush }"/>
</ControlTemplate>
</ResourceDictionary>
Then MainWindow uses the template defined.
<Control Template="{StaticResource ct}"/>
Run. It says cannot find appBrush. What's the problem?
Note, changing StaticResource to DynamicResource definitely lets it work. But what is the reason forcing me to make the change?
Change your App.xaml to this and it will work:
<Application.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary>
<SolidColorBrush x:Key="appBrush" Color="Red"/>
</ResourceDictionary>
<ResourceDictionary Source="Dictionary1.xaml"/>
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Application.Resources>
I believe it is related to how resources are merged together. In these type of situations, I always use a Brushes.xaml resource dictionary to define all my brushes, and merge that in ahead of any other resource dictionaries.
in order to clean up my code, I'm trying to split my app.xaml into seperate resource dictionaries. This works at runtime, but not at design time:
snipped in app.xaml
<Application.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="/;component/Theme/Colors.xaml" />
<ResourceDictionary Source="/;component/Theme/Styles.xaml" />
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Application.Resources>
Colors.xaml
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<SolidColorBrush x:Key="backgroundBrush" Color="Gold"/>
</ResourceDictionary>
Styles.xaml
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<Style TargetType="StatusBar">
<Setter Property="Background" Value="{StaticResource backgroundBrush}" />
</Style>
</ResourceDictionary>
Snipped of MainWindow.xaml
<Window x:Class="test.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="test" Width="800" Height="600" >
<StatusBar Name="statusBar" DockPanel.Dock="Bottom">
<StatusBarItem Content="{Binding statusMessage}" />
</StatusBar>
DesignView gives the error:
Error 8 '{DependencyProperty.UnsetValue}' is not a valid value for property 'Background'. C:\Daten\DotNet\test\test\MainWindow.xaml 123
If I put backgroundBrush directly into app.xaml like so:
<Application.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="/;component/Theme/Colors.xaml" />
<ResourceDictionary Source="/;component/Theme/Styles.xaml" />
<ResourceDictionary>
<SolidColorBrush x:Key="backgroundBrush" Color="Gold"/>
</ResourceDictionary>
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Application.Resources>
DesignView has no problems.
So is there a way to tell DesignView where to find backgroundBrush, if this brush is placed into a seperate resource dictionary?
Thats the problem with StaticResource isnt it. It needs the resource key resolved explicitly using shared \ merged \ direct resource dictionaries hierarchically up.
There are two options...
merge Colors.xaml dictionary in Styles.xaml
OR
in Styles.xaml refer the bursh using DynamicResource.
In case Resources are in different assemblies than that where MainWindow resides and the one dictionary is refering to the other dictionary. In that case reference is not resolved. This bug is already reported at Microsoft site in case your target framework is 4.0. However they have provided a workaround for it. Simply add the empty style in your Resource dictionaries and it will work fine like this -
<Application.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="/;component/Theme/Colors.xaml" />
<ResourceDictionary Source="/;component/Theme/Styles.xaml" />
</ResourceDictionary.MergedDictionaries>
<Style TargetType="{x:Type Window}"/>
</ResourceDictionary>
</Application.Resources>
For further refernce please look at this link - https://connect.microsoft.com/VisualStudio/feedback/details/555322/global-wpf-styles-are-not-shown-when-using-2-levels-of-references#details
Try
{StaticResource ApplicationPageBackgroundThemeBrush}
for your status bar background value
I Have a ResourceDictionary Generic.xaml which consists of a set of other resource dictionaries, this is achieved by merging dicionaries. If no resources other than merged dictionaries are defined in my Generic.xaml, during the runtime no styles gets applied.
However if I define any styles in the Gerneric.xaml all starts to work properly.
So the example below doesn't work (this is from my Generic.xaml)
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="pack://application:,,,/Resources;component/ResourceDictionaries/CommonControls/CommonControlsResources.xaml"/>
</ResourceDictionary.MergedDictionaries>
<!--<Style TargetType="{x:Type ToolTip}"/>-->
And here is the working version:
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="pack://application:,,,/Resources;component/ResourceDictionaries/CommonControls/CommonControlsResources.xaml"/>
</ResourceDictionary.MergedDictionaries>
<Style TargetType="{x:Type ToolTip}"/>
Why is that happening?
Edit:
To pin point the problem I have created a sample solution. So the structure of the project is following:
ProjectA WPF Windows Application
ProjectC Class Library, containing styles which are share among all project in the solution folder.
Here is the ProjectA:
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="pack://application:,,,/ProjectC;component/Themes/ThemeZ.xaml"/>
</ResourceDictionary.MergedDictionaries>
<!--<Style TargetType="{x:Type ToolTip}"/>-->
</ResourceDictionary>
<Application x:Class="MergedResourceDictionaryIssue.App"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
StartupUri="MainWindow.xaml">
<Application.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="/Themes/Generic.xaml"/>
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Application.Resources>
</Application>
<Window x:Class="MergedResourceDictionaryIssue.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525">
<Grid>
<Button/>
</Grid>
</Window>
Here is the ProjectC:
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<!-- Styles for all our buttons, let make them all red squares -->
<Style TargetType="{x:Type Button}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate>
<Grid Width="50"
Height="50"
Background="Red" />
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</ResourceDictionary>
And again if I uncomment the code in the ResourceDictionary project renders as expected, but otherwise the resource dictionary is simply ignored.
According to me, a Dictionary can only contain :
- merged dictionaries
- OR styles
Edit : They are discussing about it here It's a "known" issue and the trick that you used is the currently workaround.
I am following prism to build wpf application. In my application, there is a helper class library where I defined resources and styles which is going to be used by multiple class libraries in the solution.
But I am getting error when I try to set a resource to Style attribute of a window. The window is in differnt class library as of a resource.
The error that I am getting is :
Cannot find resource named '{resourceName}'. Resource names are case sensitive. Error at object 'MyWindow' in markup file
I used the following code but it is not working
<Window x:Class="Class1" Style="{StaticResource resourceName}">
<Window.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="pack://application:,,,/classlibrary;component/Dictionary/resource1.xaml" /> </ResourceDictionary.MergedDictionaries>
< /ResourceDictionary>
< /Window.Resources>
</Window>
You need to use the DynamicResource markup extension. The reason for this is because the external ResourceDictionary you import is declared in your xaml after the style is set for your Window. A working example of setting a Window's style with a style defined in a referenced class library is below:
The "MainWindow" xaml:
<Window x:Class="WpfApplication3.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525"
Style="{DynamicResource TestStyle}">
<Window.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary
Source="pack://application:,,,/ClassLibrary1;component/Styles.xaml">
</ResourceDictionary>
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Window.Resources>
<Grid>
</Grid>
</Window>
The ResourceDictionary (defined in a file named Styles.xaml) in a class library:
<ResourceDictionary
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<Style x:Key="TestStyle" TargetType="Window">
<Setter Property="Background">
<Setter.Value>
<SolidColorBrush Color="Green"></SolidColorBrush>
</Setter.Value>
</Setter>
</Style>
</ResourceDictionary>
You can use a pack URL to get a resource dictionary from another assembly. Check this thread.
Here is an example of a resource dictionary read from a Common assembly:
<Application.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="pack://application:,,,/Common;component/styles.xaml"/>
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Application.Resources>