Winform TextBox中只能输入数字的几种常用方法(C#)

方法一：  

private void tBox_KeyPress(object sender, KeyPressEventArgs e)  

 {
            if (e.KeyChar == 0x20) e.KeyChar = (char);  //禁止空格键
            if ((e.KeyChar == 0x2D) && (((TextBox)sender).Text.Length == )) return;   //处理负数
            if (e.KeyChar > 0x20)
            {
                try
                {
                    double.Parse(((TextBox)sender).Text + e.KeyChar.ToString());
                }
                catch
                {
                    e.KeyChar = (char);   //处理非法字符
                }
            }
}  

方法二：  

private void TextBox_KeyPress(object sender, KeyPressEventArgs e)
 {
    if(e.KeyChar!=&&!Char.IsDigit(e.KeyChar))
    {
      e.Handled = true;
    }
}
或者  

private void TextBox_KeyPress(object sender, KeyPressEventArgs e)
{
    if(e.KeyChar!='\b'&&!Char.IsDigit(e.KeyChar))
    {
      e.Handled = true;
    }  

}  

方法三:  

private void textBox1_KeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e)
{
if(e.KeyChar!='\b')//这是允许输入退格键
{
if((e.KeyChar<'')||(e.KeyChar>''))//这是允许输入0-9数字
{
e.Handled = true;
}
}
}  

方法四:  

private void textBox1_Validating(object sender, CancelEventArgs e)
{
const string pattern = @"^\d+\.?\d+{1}quot;;
string content = ((TextBox)sender).Text;   

if (!(Regex.IsMatch(content, pattern)))
{
errorProvider1.SetError((Control)sender, "只能输入数字!");
e.Cancel = true;
}
else
errorProvider1.SetError((Control)sender, null);
}  

方法五:  

private void textBox1_KeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e)
{
if(e.KeyChar=='.' && this.textBox1.Text.IndexOf(".")!=-)
{
e.Handled=true;
}  

if(!((e.KeyChar>= && e.KeyChar<=) || e.KeyChar=='.' || e.KeyChar==))
{
e.Handled=true;
}  

}  

方法六：  

private void tbx_LsRegCapital_KeyPress(object sender, KeyPressEventArgs e)
{
            if (!Char.IsNumber(e.KeyChar) && !Char.IsPunctuation(e.KeyChar) && !Char.IsControl(e.KeyChar))
            {
                e.Handled = true;//消除不合适字符
            }
            else if (Char.IsPunctuation(e.KeyChar))
            {
                if (e.KeyChar != '.' || this.textBox1.Text.Length == )//小数点
                {
                    e.Handled = true;
                }
                if (textBox1.Text.LastIndexOf('.') != -)
                {
                    e.Handled = true;
                }
            }
  }    

方法七:  

利用ASCII码处理办法、
{  

            if ((e.KeyChar <=  || e.KeyChar >=) && (e.KeyChar != ) && (e.KeyChar != ))
              e.Handled = true;
================48代表0，57代表9，8代表空格，46代表小数点
}