---
lang: ja-jp
breaks: true
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# WPF Comboboxにenumをバインドして選択値を取得・変更する 2022-08-01

:::info
WinUI 3で同じことをやってみたがうまくいかないので、WPFでも試してみる。
※正常に動作する。。。
:::


## MainWindow.xaml

<Window x:Class="WpfApp1.MainWindow"
		xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
		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"
		xmlns:local="clr-namespace:WpfApp1"
		mc:Ignorable="d"
		Title="MainWindow" Height="450" Width="800">
	<Window.DataContext>
		<local:MainWindowModelView />
	</Window.DataContext>
	<Grid>
		<StackPanel>
			<ComboBox 
				ItemsSource="{Binding Path=EnumSamples}" 
				SelectedValue="{Binding Path=EnumSample}"
				/>
			<Button x:Name="getValueButton" Click="getValueButton_Click">値の取得</Button>
			<TextBlock x:Name="viewValueTextBlock"></TextBlock>
			<Button x:Name="changeValueButton" Click="changeValueButton_Click">値の変更</Button>

		</StackPanel>
	</Grid>
</Window>

## MainWindow.xaml.cs

namespace WpfApp1;

/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
    MainWindowModelView viewModel;

    public MainWindow()
    {
        InitializeComponent();

        viewModel = (MainWindowModelView)DataContext;
    }

    private void getValueButton_Click(object sender, RoutedEventArgs e)
    {
        viewValueTextBlock.Text = viewModel.EnumSample?.ToString();
    }

    private void changeValueButton_Click(object sender, RoutedEventArgs e)
    {
        viewModel.EnumSample = EnumSamples.EEE;
    }
}

## MainWindowModelView.cs

namespace WpfApp1;

public enum EnumSamples
{
    AAA,
    BBB,
    CCC,
    DDD,
    EEE
}

public class MainWindowModelView:
    INotifyPropertyChanged
{
    public IEnumerable<EnumSamples> EnumSamples
    {
        get 
        { 
            return Enum.GetValues<EnumSamples>(); 
        }
    }

    private EnumSamples? m_enumSample;

    public EnumSamples? EnumSample { get { return this.m_enumSample; } set { if (value == this.m_enumSample) { return; } this.m_enumSample = value; OnPropertyChanged(nameof(EnumSample)); } }

    public event PropertyChangedEventHandler PropertyChanged;
    public event PropertyChangedEventHandler PropertyChanged_EnumSample;
    private void OnPropertyChanged([System.Runtime.CompilerServices.CallerMemberName] string propertyName = null)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        switch (propertyName)
        {
            case nameof(EnumSample):
                PropertyChanged_EnumSample?.Invoke(this, new PropertyChangedEventArgs(propertyName));
                break;
        }
    }
}

###### tags: `WPF` `Combobox` `enum` `Bind`