task5_mvvm/task5_avalonia_mvvm_start/Views/CalculatorView.axaml

<UserControl xmlns="https://github.com/avaloniaui"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
             x:Class="task5_avalonia_mvvm_start.CalculatorView"
			 x:DataType="vm:MainWindowViewModel"
			 xmlns:vm="using:task5_avalonia_mvvm_start.ViewModels">
	<Grid>
		<StackPanel Classes="spBackground">
			<TextBlock Classes="headerCalc" Text="Выберите арифметическую операцию"></TextBlock>
			<StackPanel Classes="spAriphmetic">
				<ComboBox Classes="cbAriphm" ItemsSource="{Binding CalculatorVM.OperationsList}" SelectedItem="{Binding CalculatorVM.SelectedOperation}">
					<ComboBox.ItemTemplate>
						<DataTemplate>
							<TextBlock Text="{Binding Name}"/>
						</DataTemplate>
					</ComboBox.ItemTemplate>
				</ComboBox>
				<StackPanel Classes="spNums" Orientation="Horizontal">
					<TextBox Classes="tbNum" Text="{Binding CalculatorVM.Num1}"></TextBox>
					<TextBlock Classes="tbNum" Text="{Binding CalculatorVM.SelectedSign}"></TextBlock>
					<TextBox Classes="tbNum" Text="{Binding CalculatorVM.Num2}"></TextBox>
				</StackPanel>
			</StackPanel>
			<Button Classes="bCalc" Command="{Binding CalculatorVM.ToCalculate}">Вычислить</Button>
			<TextBlock Classes="headerCalc">Результат:</TextBlock>
			<TextBlock Classes="footerCalc" Text="{Binding CalculatorVM.Result}"></TextBlock>
		</StackPanel>
	</Grid>
</UserControl>