Question

I want to create a custom control (derived from Control class), and when I drag this custom control to a form in designer, I can only change its width. This feature is same as single-line textbox.

Update: My application is Windows Form.

Answer 1

See http://www.windowsdevelop.com/windows-forms-general/how-to-set-that-a-control-resizes-in-width-only-9207.shtml.

You override SetBoundsCore and define a Designer to remove top and bottom resize handles.

using System;
using System.ComponentModel;
using System.Windows.Forms;
using System.Windows.Forms.Design;

namespace MyControlProject
{
    [Designer(typeof(MyControlDesigner))]
    public class MyControl : Control
    {
        protected override void SetBoundsCore(int x, int y, int width, int height, BoundsSpecified specified)
        {
            height = 50;
            base.SetBoundsCore(x, y, width, height, specified);
        }
    }

    internal class MyControlDesigner : ControlDesigner
    {
        MyControlDesigner()
        {
            base.AutoResizeHandles = true;
        }
        public override SelectionRules SelectionRules
        {
            get
            {
                return SelectionRules.LeftSizeable | SelectionRules.RightSizeable | SelectionRules.Moveable;
            }
        }
    }
}