c＃usercontrol設置自定義屬性的選項列表

Question

我想創建一個自定義可摺疊面板用於我的項目之一。我設置它來顯示哪些邊應該能夠摺疊，並且它需要一個字符串輸入{"None", "Up", "Right", "Down", "Left", "All"};。

這是我到目前爲止有：

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; 
     } 
    } 
} 

有人能向我解釋如何讓設計師賦予用戶DirectionOptions列表作爲可能的值？他們可以選擇任何一個字符串作爲值。

Answer 1

用戶應該能夠選擇多個選項還是隻有一個？

如果它只是一個 - 那麼屬性應該是一個枚舉而不是一個列表。

像這樣的東西應該工作：

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 - 這是指南 - 我沒有測試的代碼，但應該把你在你想達到什麼樣的大方向。