c# usercontrol 设置自定义属性的选项列表

Question

我正在尝试创建一个自定义可折叠面板以用于我的一个项目。我将它设置为显示哪些边应该能够折叠，它需要一个字符串输入 {"None", "Up", "Right", "Down", "Left", "All"}; 。

这是我目前所拥有的:

public partial class CollapsiblePanel : UserControl
{
    # region Collapse Direction
    List<string> DirectionOptions = new List<string> { "None", "Up", "Right", "Down", "Left", "All" };
    [Browsable(true), DefaultValue("All"), Description("Direction panel collapses. 0-none, 1-up, 2-right, 3-down, 4-left, 5-all")]
    [ListBindable(true), Editor(typeof(ComboBox), typeof(UITypeEditor))]
    private string _direction = "All";
    public List<string> Direction
    {
        get { return DirectionOptions; }
        set
        {
            DirectionOptions = value;
            callCollapseDirectionChanged();
        }
    }

    public event Action CollapseDirectionChanged;
    protected void callCollapseDirectionChanged()
    {
        Action handler = CollapseDirectionChanged;
        DisplayButtons();
        if (handler != null)
        {
            handler();
        }
    }
    # endregion

    public CollapsiblePanel()
    {
        InitializeComponent();
    }

    private void DisplayButtons()
    {
        switch (_direction)
        {
            case "None":
                buttonDown.Visible = false;
                buttonUp.Visible = false;
                buttonRight.Visible = false;
                buttonLeft.Visible = false;
                break;

            case "Up":
                buttonDown.Visible = false;
                buttonUp.Visible = true;
                buttonRight.Visible = false;
                buttonLeft.Visible = false;
                break;

            case "Right":
                buttonDown.Visible = false;
                buttonUp.Visible = false;
                buttonRight.Visible = true;
                buttonLeft.Visible = false;
                break;

            case "Down":
                buttonDown.Visible = true;
                buttonUp.Visible = false;
                buttonRight.Visible = false;
                buttonLeft.Visible = false;
                break;

            case "Left":
                buttonDown.Visible = false;
                buttonUp.Visible = false;
                buttonRight.Visible = false;
                buttonLeft.Visible = true;
                break;

            case "All":
                buttonDown.Visible = true;
                buttonUp.Visible = true;
                buttonRight.Visible = true;
                buttonLeft.Visible = true;
                break;
        }
    }
}

有人可以向我解释如何让设计者为用户提供 DirectionOptions 列表作为可能的值吗？他们可以选择任何一个字符串作为值。

Answer 1

用户应该能够选择多个选项还是只能选择一个？

如果只有一个 - 那么该属性应该是枚举而不是列表。

像这样的东西应该可以工作:

public partial class CollapsiblePanel : UserControl
{
    public enum CollapseDirection
    {
        None,
        Up,
        Right,
        Down,
        Left,
        All
    }

    # region Collapse Direction

    [Browsable(true), DefaultValue("All"), Description("Direction panel collapses. 0-none, 1-up, 2-right, 3-down, 4-left, 5-all")]
    [ListBindable(true), Editor(typeof(ComboBox), typeof(UITypeEditor))]
    private CollapseDirection _direction = CollapseDirection.All;
    public CollapseDirection Direction
    {
        get { return _direction; }
        set
        {
            _direction = value;
            callCollapseDirectionChanged();
        }
    }

    public event Action CollapseDirectionChanged;
    protected void callCollapseDirectionChanged()
    {
        Action handler = CollapseDirectionChanged;
        DisplayButtons();
        if (handler != null)
        {
            handler();
        }
    }
    # endregion

    public CollapsiblePanel()
    {
        InitializeComponent();
    }

    private void DisplayButtons()
    {
        switch (_direction)
        {
            case CollapseDirection.None:
                buttonDown.Visible = false;
                buttonUp.Visible = false;
                buttonRight.Visible = false;
                buttonLeft.Visible = false;
                break;

            case CollapseDirection.Up:
                buttonDown.Visible = false;
                buttonUp.Visible = true;
                buttonRight.Visible = false;
                buttonLeft.Visible = false;
                break;

            case CollapseDirection.Right:
                buttonDown.Visible = false;
                buttonUp.Visible = false;
                buttonRight.Visible = true;
                buttonLeft.Visible = false;
                break;

            case CollapseDirection.Down:
                buttonDown.Visible = true;
                buttonUp.Visible = false;
                buttonRight.Visible = false;
                buttonLeft.Visible = false;
                break;

            case CollapseDirection.Left:
                buttonDown.Visible = false;
                buttonUp.Visible = false;
                buttonRight.Visible = false;
                buttonLeft.Visible = true;
                break;

            case CollapseDirection.All:
                buttonDown.Visible = true;
                buttonUp.Visible = true;
                buttonRight.Visible = true;
                buttonLeft.Visible = true;
                break;
        }
    }
}

• 注意 - 这是指南 - 我还没有测试代码，但这应该让你了解你想要实现的目标的大体方向。