The resource "x" could not be resolved.
Solution 1
WPF is unable to resolve the resource dictionary that you are trying to merge. When you create a merged dictionary, WPF follows a set of rules to attempt to resolve the URI. In your case, the URI is ambiguous, so WPF is unable to reliably resolve it.
Change the Source
URI in the App.xaml
to an absolute pack URI. For example, if you project is called MyProject
(i.e.: "MyProject" is the short assembly name), then you should change the Source
in App.xaml
to:
<ResourceDictionary
Source="/MyProject;component/AppStyles.xaml"/>
This assumes AppStyles.xaml
is in the root of MyProject
. You can optionally specify the authority, assembly version and public key information of the signed assembly. However, you should be safe with the short assembly name (MyProject, in the above example).
See this page on MSDN for further details on Pack URIs in WPF: http://msdn.microsoft.com/en-us/library/aa970069(v=vs.110).aspx
Solution 2
I also have this problem time to time in VS2010. Sometimes the problem will solve if I make a "Clean Solution" and a "Rebuild Solution". If that do not work I usually restart VS2010.
I have also renamed the Style x:Key to something else and the problem was gone. But I dont find this solution to be perfect...
<Application.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<!-- Load Infrastructure's Resource Dictionaries -->
<ResourceDictionary Source="/MyProject.Modules.Infrastructure;component/ResourceDictionaries/ResourceLibrary.xaml" />
</ResourceDictionary.MergedDictionaries>
<!-- Workaround for ResourceDictionary loading bug/optimization -->
<Style TargetType="{x:Type Rectangle}" />
</ResourceDictionary>
Reference to this question regarding the Workaround in my code sample: Trouble referencing a Resource Dictionary that contains a Merged Dictionary
Solution 3
you can create a common or infrastructure project from which other projects will reference. Add your resouce resources. Then create a pack URI. then reference in your usercontrol or window resources within a resource dictionary
<...Resources>
<ResourceDictionary>
<!-- Resource Dictionaries -->
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary
Source="pack://application:,,,/Common;component/Dictionaries/Styles.xaml"/>
</ResourceDictionary.MergedDictionaries>
In the usercontrol or use Window.Resources in the case of a window. This works for me.
Solution 4
it is possible to use the relative path to your appStyles.xaml folder. hope this helps.
something like below
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="../Resources/Styles.xaml"></ResourceDictionary>
</ResourceDictionary.MergedDictionaries>
<ResourceDictionary>
Solution 5
I had placed some Style in Window.Resources a this caused my problem
After deleting all styles from MainWindow problem disappeared.
Found second problem:
Problem was Platform Target set to x64.
After changing it to AnyCPU the resources in design works..
Chrisjan Lodewyks
Updated on December 06, 2020Comments
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Chrisjan Lodewyks over 3 years
I have recently upgraded to VS 2012, I had to as I needed to start using the .net 4.5 but that is besides the point. My problem is the following:
I have a
ResourceDictionary
in my main project calledAppStyles.xaml
, and in theApp.Xaml
I have the following:<ResourceDictionary> <ResourceDictionary.MergedDictionaries> <ResourceDictionary Source="AppStyles.xaml"/> <ResourceDictionary.MergedDictionaries> </ResourceDictionary>
In my
ResourceDictionary
there is a style, and I could then apply this style to any button in any of my projects by settingStyle={StaticResource MyButton}
.After upgrading to VS 2012 I noticed I get the error in the title a lot, and sometimes it stops me from debugging and sometimes it doesn't!
Is there a different way that I should be doing this or is there a problem in VS 2012?
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Chrisjan Lodewyks about 11 yearsI have cleaned, rebuilt, restarted and even restarted my computer! This error keeps popping up and it makes no sense, it was running perfectly one second and the next it could no longer compile!
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hijack about 11 yearsHmm. This is so strange. Have you tried to rename your Style keys?
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Chrisjan Lodewyks about 11 yearsYes I have, the problem remains! It does not stop me from compiling anymore, but none of my custom controls that use this style can be showed in design!
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superjos about 9 yearsswitching the dictionary build action to Resource does not change anything