Little Registry Cleaner/Common Tools/TreeViewAdv/NumericTextBox.cs

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using System;
using System.ComponentModel;
using System.Windows.Forms;
using System.Globalization;


namespace Common_Tools.TreeViewAdv
{
	/// <summary>
	/// Restricts the entry of characters to digits, the negative sign,
	/// the decimal point, and editing keystrokes (backspace).
	/// It does not handle the AltGr key so any keys that can be created in any
	/// combination with AltGr these are not filtered
	/// </summary>
	public class NumericTextBox : TextBox
	{
		private const int WM_PASTE = 0x302;
		private NumberStyles numberStyle = NumberStyles.AllowDecimalPoint | NumberStyles.AllowLeadingSign;

		/// <summary>
		/// Restricts the entry of characters to digits, the negative sign,
		/// the decimal point, and editing keystrokes (backspace).
		/// It does not handle the AltGr key
		/// </summary>
		/// <param name="e"></param>
		protected override void OnKeyPress(KeyPressEventArgs e)
		{
			base.OnKeyPress(e);

			e.Handled = invalidNumeric(e.KeyChar);
		}


		/// <summary>
		/// Main method for verifying allowed keypresses.
		/// This does not catch cut paste copy ... operations.
		/// </summary>
		/// <param name="key"></param>
		/// <returns></returns>
		private bool invalidNumeric(char key)
		{
			bool handled = false;

			NumberFormatInfo numberFormatInfo = CultureInfo.CurrentCulture.NumberFormat;
			string decimalSeparator = numberFormatInfo.NumberDecimalSeparator;
			string negativeSign = numberFormatInfo.NegativeSign;

			string keyString = key.ToString();

			if (Char.IsDigit(key))
			{
				// Digits are OK
			}
			else if (AllowDecimalSeparator && keyString.Equals(decimalSeparator))
			{
				if (Text.IndexOf(decimalSeparator) >= 0)
				{
					handled = true;
				}
			}