如何使UserControl锁定到一定的高度？

Question

不允许用户TextBox垂直调整控件的大小.a的高度TextBox被锁定到文本框应该是理想的高度.

更重要的是,Visual Studio甚至不提供垂直拖动句柄:

我如何为我提供相同的机制UserControl？

Answer 1

我将详细阐述汉斯的评论.您可以将专用代码(称为Designer)与UserControl相关联,以便在将其放置在Visual Studio中的表单上时,用户在配置控件的方式上受到限制.

1. System.Design在项目中添加引用.

2. 使用以下示例代码:

   [Designer(typeof(FixedHeightUserControlDesigner))]
   public partial class FixedHeightUserControl : UserControl
   {
       private const int FIXED_HEIGHT = 25;
   
       protected override void OnSizeChanged(EventArgs e)
       {
           if (this.Size.Height != FIXED_HEIGHT)
               this.Size = new Size(this.Size.Width, FIXED_HEIGHT);
   
           base.OnSizeChanged(e);
       }
   
       public FixedHeightUserControl()
       {
           InitializeComponent();
   
           this.Height = FIXED_HEIGHT;
       }
   }
   
   public class FixedHeightUserControlDesigner : ParentControlDesigner
   {
       private static string[] _propsToRemove = new string[] { "Height", "Size" };
   
       public override SelectionRules SelectionRules
       {
           get { return SelectionRules.LeftSizeable | SelectionRules.RightSizeable | SelectionRules.Moveable; }
       }
   
       protected override void PreFilterProperties(System.Collections.IDictionary properties)
       {
           base.PreFilterProperties(properties);
           foreach (string p in _propsToRemove)
               if (properties.Contains(p))
                   properties.Remove(p);
       }
   }