CodeWalker/CodeWalker.WinForms/TextBoxFix.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace CodeWalker.WinForms
{
    public partial class TextBoxFix : TextBox
    {
        public TextBoxFix()
        {
            InitializeComponent();
        }

        protected override void OnPaint(PaintEventArgs pe)
        {
            base.OnPaint(pe);
        }

        protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
        {
            //Fix for Ctrl-A not working in multiline textboxes.
            const int WM_KEYDOWN = 0x100;
            var keyCode = (Keys)(msg.WParam.ToInt32() & Convert.ToInt32(Keys.KeyCode));
            if ((msg.Msg == WM_KEYDOWN && keyCode == Keys.A) && (ModifierKeys == Keys.Control) && Focused)
            {
                SelectAll();
                return true;
            }
            return base.ProcessCmdKey(ref msg, keyData);
        }
    }
}