TextBox中只能输入数字的几种常用方法(C#)

TextBox中只能输入数字的几种常用方法(C#)

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



private void TextBox_KeyPress(object sender, KeyPressEventArgs e)
   {
    if(e.KeyChar!=8&&!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;
    }

}


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<'0')||(e.KeyChar>'9'))//这是允许输入0-9数字
{
e.Handled = true;
}
}
} 





private void button1_Click(object sender, EventArgs e) 
{ 
string text = this.textBox1.Text; 
if (text != null) 
MessageBox.Show(text); 
}