using System;
using System.Collections.Generic;
using System.Text;
using System.Windows .Forms ;
using System.Text .RegularExpressions ;
using System.Globalization;
/* Updated at Jan 1st, 2009 By 水南(skyline-moon.blog.5d.cn)
* This code show you how to write a TextBox that allow only numeric data can be input
* License GNU/GPL
*
*/
namespace yourNameSpce-
{
public class NumTxtBox : TextBox
{
private bool isNumeric(string str)
{
Regex regex = new Regex(@"^[-+]?[0-9]*\.?[0-9]+$ ");
return regex.IsMatch(str);
}
bool allowSpace = false;
// Restricts the entry of characters to digits (including hex), the negative sign,
// the decimal point, and editing keystrokes (backspace).
protected override void OnKeyPress(KeyPressEventArgs e)
{
base.OnKeyPress(e);
NumberFormatInfo numberFormatInfo = System.Globalization.CultureInfo.CurrentCulture.NumberFormat;
string decimalSeparator = numberFormatInfo.NumberDecimalSeparator;
//string groupSeparator = numberFormatInfo.NumberGroupSeparator;
string negativeSign = numberFormatInfo.NegativeSign;
string positiveSign = numberFormatInfo.PositiveSign;
string keyInput = e.KeyChar.ToString();
//if (groupSeparator == ((char)160).ToString()) groupSeparator = " "; // workaround, change non-breaking space to normal space
if (Char.IsDigit(e.KeyChar) )
{
// Digits are OK
}
else if ((e.KeyChar == 'e' || e.KeyChar == 'E') && isNumeric(this.Text))
{
//2009-1-2(zenghuasen):Scientific(exponential) format data will be accepted here
}
else if (keyInput.Equals(decimalSeparator) || keyInput.Equals(positiveSign) ||
keyInput.Equals(negativeSign))
{
// Decimal separator is OK
}
else if (e.KeyChar == '\b')
{
// Backspace key is OK
}
// else if ((ModifierKeys & (Keys.Control | Keys.Alt)) != 0)
// {
// // Let the edit control handle control and alt key combinations
// }
else if (this.allowSpace && e.KeyChar == ' ')
{
}
else
{
// Consume this invalid key and beep
e.Handled = true;
// MessageBeep();
}
}
public int IntValue
{
get
{
return Int32.Parse(this.Text);
}
}
public decimal DecimalValue
{
get
{
return Decimal.Parse(this.Text);
}
}
public bool AllowSpace
{
set
{
this.allowSpace = value;
}
get
{
return this.allowSpace;
}
}
}
}
