Winforms Bind Enum to Radio Buttons

Question

If I have three radio buttons, what is the best way to bind them to an enum which has the same choices? e.g.

[] Choice 1
[] Choice 2
[] Choice 3

public enum MyChoices
{
    Choice1,
    Choice2,
    Choice3
}

Answer 1

Add a dictionary with Dictionary and add all your radiobuttons there with the id of your enum then change your enum to this:

public enum MyChoices
{
    Choice1 =1,
    Choice2 =2,
    Choice3 =4
}

And get the enum by this:

RadioButtons[(int)MyChoices.Choice1]

edit:changed my answer

Answer 2

Could you create three boolean properties:

private MyChoices myChoice;

public bool MyChoice_Choice1
{
    get { return myChoice == MyChoices.Choice1; }
    set { if (value) myChoice = MyChoices.Choice1; myChoiceChanged(); }
}

// and so on for the other two

private void myChoiceChanged()
{
    OnPropertyChanged(new PropertyChangedEventArgs("MyChoice_Choice1"));
    OnPropertyChanged(new PropertyChangedEventArgs("MyChoice_Choice2"));
    OnPropertyChanged(new PropertyChangedEventArgs("MyChoice_Choice3"));
}

then bind to MyChoice_Choice1 and the others?

Answer 3

I just thought I'd add the way that I'm currently doing it. There's no 'binding' as such but hopefully it does the same job.

Comments welcome.

public enum MyChoices
{
    Choice1,
    Choice2,
    Choice3
}

public partial class Form1 : Form
{
    private Dictionary<int, RadioButton> radButtons;
    private MyChoices choices;

    public Form1()
    {
        this.InitializeComponent();
        this.radButtons = new Dictionary<int, RadioButton>();
        this.radButtons.Add(0, this.radioButton1);
        this.radButtons.Add(1, this.radioButton2);
        this.radButtons.Add(2, this.radioButton3);

        foreach (var item in this.radButtons)
        {
            item.Value.CheckedChanged += new EventHandler(RadioButton_CheckedChanged);
        }
    }

    private void RadioButton_CheckedChanged(object sender, EventArgs e)
    {
        RadioButton button = sender as RadioButton;
        foreach (var item in this.radButtons)
        {
            if (item.Value == button)
            {
                this.choices = (MyChoices)item.Key;
            }
        }
    }

    public MyChoices Choices
    {
        get { return this.choices; }
        set
        {
            this.choices = value;
            this.SelectRadioButton(value);
            this.OnPropertyChanged(new PropertyChangedEventArgs("Choices"));
        }
    }

    private void SelectRadioButton(MyChoices choiceID)
    {
        RadioButton button;
        this.radButtons.TryGetValue((int)choiceID, out button);
        button.Checked = true;
    }
}