App.xaml

<Application x:Class="YarcheTextEditor.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:local="clr-namespace:YarcheTextEditor"
             xmlns:views="clr-namespace:YarcheTextEditor.Views"
             xmlns:vm="clr-namespace:YarcheTextEditor.ViewModels"
             StartupUri="Views\MainWindow.xaml">
    <Application.Resources>
        <ResourceDictionary>
            <DataTemplate DataType="{x:Type vm:LoadFileViewModel}">
                <views:LoadFilePage />
            </DataTemplate>
            <DataTemplate DataType="{x:Type vm:WorkFileViewModel}">
                <views:WorkFilePage />
            </DataTemplate>
            <ResourceDictionary.MergedDictionaries>
                <ResourceDictionary Source="Dictionaries\ImagesDictionary.xaml"/>
                <ResourceDictionary Source="Dictionaries\StylesDictionary.xaml"/>
            </ResourceDictionary.MergedDictionaries>
        </ResourceDictionary>
    </Application.Resources>
</Application>