WPF Resources - the property can have only one child element if it uses an explicit collection tag

Question

I am trying to add a resource dictionary to a user control as follows:

User Control View/AllOrdersView.xaml

Resource Dictionary View/AllOrdersViewResources.xaml

Solution Explorer Showing the UserControl and ResourceDictionary

Error Message

Cannot add element to property 'Resources', because the property can have only one child element if it uses an explicit collection tag.

Troubleshooting Steps

• Ensure the build action of AllOrderViewResource.xaml is "page" as suggested in this question: Cannot find resource dictionary in WPF application

Answer 1

Your XAML is wrong. This is the right way to merge ResourceDictionaries:

<UserControl.Resources>
    <ResourceDictionary>
       <ResourceDictionary.MergedDictionaries>
           <ResourceDictionary Source="AllOrdersViewResources.xaml"/>
       </ResourceDictionary.MergedDictionaries>

       <!-- More resources here -->
    </ResourceDictionary>
</UserControl.Resources>