How can I add a folder to a WPF solution?

Question

我正在编辑App.xaml文件，向其中添加新的资源字典，该字典是在应用程序的同一文件夹中创建的，但是App.xaml无法识别文件的存在，除非我通过手动将其添加到解决方案文件夹中：添加Existingfile或拖动它

Answer 1

I was getting the message "Error during the localization of the ResourceDictionary" despite of referencing a existing document, which wasn't in any assembly

<Application x:Class="Interface_de_Teste.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>
      <Canvas x:Key="sadf"></Canvas>
      <SolidColorBrush x:Key="123"></SolidColorBrush>
            <ResourceDictionary.MergedDictionaries>
                <ResourceDictionary Source="file:///C:/Users/jfrne/source/repos/Interface%20de%20Teste/Styles/Styles.xaml" />
      </ResourceDictionary.MergedDictionaries>
    </ResourceDictionary>
  </Application.Resources>
</Application>

But the code compiled despite the error by using this source format