winform textbox 只能输入数字和小数点

Question

winform textbox 只能输入数字和小数点

Answer 1

keypress事件按照我下面写的吧 ，如果想用正则表达式就是楼上的 textBox1.KeyPress +=new KeyPressEventHandler(textBox1_KeyPress);
        private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
        {
            if (char.IsNumber(e.KeyChar) || e.KeyChar == '.'||char.IsControl(e.KeyChar))
            {
                e.Handled = false;
            }
            else
            {
                e.Handled = true;
            }
        }

Answer 2

控制只能输入整数或小数(供TextBox注册KeyPress事件)#region 控制只能输入整数或小数(供TextBox注册KeyPress事件)
        /**//// <summary>
        /// 控制只能输入整数或小数
        /// (小数位最多位4位，小数位可以自己修改)
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void Txb_Decimal_KeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e)
        {
            if(!(((e.KeyChar >= '0') && (e.KeyChar <= '9')) || e.KeyChar <= 31))
            {
                if(e.KeyChar == '.')
                {
                    if ( ((TextBox)sender).Text.Trim().IndexOf('.') > -1)
                        e.Handled   = true;
                }
                else
                    e.Handled = true;
            }    
            else
            {
                if( e.KeyChar <= 31 )
                {
                    e.Handled = false ;
                }
                else if( ((TextBox)sender).Text.Trim().IndexOf('.') > -1 )
                {
                    if( ((TextBox)sender).Text.Trim().Substring(((TextBox)sender).Text.Trim().IndexOf('.') + 1 ).Length >= 4)
                        e.Handled = true ;
                }                
            }
        }
        #endregion