Winforms将Enum绑定到单选按钮

Posted 2021-04-05

如果我有三个单选按钮，将它们绑定到具有相同选择的枚举的最佳方法是什么？例如

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

public enum MyChoices
{
    Choice1,
    Choice2,
    Choice3
}

答案

我知道这是一个老问题，但它是第一个出现在我的搜索结果中的问题。我想出了一种将单选按钮绑定到枚举，甚至字符串或数字等的通用方法。

    private void AddRadioCheckedBinding<T>(RadioButton radio, object dataSource, string dataMember, T trueValue)
    {
        var binding = new Binding(nameof(RadioButton.Checked), dataSource, dataMember, true, DataSourceUpdateMode.OnPropertyChanged);
        binding.Parse += (s, a) => { if ((bool)a.Value) a.Value = trueValue; };
        binding.Format += (s, a) => a.Value = ((T)a.Value).Equals(trueValue);
        radio.DataBindings.Add(binding);
    }

然后在表单的构造函数或表单加载事件上，在每个RadioButton控件上调用它。 dataSource是包含你的枚举属性的对象。我确保dataSource实现了INotifyPropertyChanged接口，在枚举属性setter中触发了OnPropertyChanged事件。

AddRadioCheckedBinding(Choice1RadioButton, dataSource, "MyChoice", MyChoices.Choice1);
AddRadioCheckedBinding(Choice2RadioButton, dataSource, "MyChoice", MyChoices.Choice2);

另一答案

你能创建三个布尔属性：

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"));
}

然后绑定到MyChoice_Choice1和其他人？

另一答案

我只是想加上我目前正在做的方式。这样没有“约束力”，但希望它能做同样的工作。

欢迎评论。

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;
    }
}