.net c# TextBox限制只能输入数字,小数点并最大到2位

.net c# winform TextBox 限制只能输入数字,小数点并最大到2位

只需要处理 KeyPress 事件即可,代码如下

        private void ztxtfive_KeyPress(object sender, KeyPressEventArgs e)
        {
            if ((e.KeyChar < 48 || e.KeyChar > 57) && e.KeyChar != 8 && e.KeyChar != (char)('.') && e.KeyChar != (char)('-'))
            {
                e.Handled = true;
            }

            if (e.KeyChar == (char)('-'))
            {
                if ((sender as TextBox).Text != "") { e.Handled = true; }
            }

            if (((TextBox)sender).Text == "-" && e.KeyChar == (char)('.'))
            {
                e.Handled = true;
            }

            if (e.KeyChar == 45 && (((TextBox)sender).SelectionStart != 0 || ((TextBox)sender).Text.IndexOf("-") >= 0))
                e.Handled = true;

            if (e.KeyChar == (char)('.') && ((TextBox)sender).Text == "")
            {
                e.Handled = true;
            }
            if (e.KeyChar == (char)('.') && ((TextBox)sender).Text.IndexOf('.') != -1)
            {
                e.Handled = true;
            }
            if (e.KeyChar != '\b' && (((TextBox)sender).SelectionStart) > (((TextBox)sender).Text.LastIndexOf('.')) + 2 && ((TextBox)sender).Text.IndexOf(".") >= 0)
                e.Handled = true;

            if (e.KeyChar != '\b' && ((TextBox)sender).SelectionStart >= (((TextBox)sender).Text.LastIndexOf('.')) && ((TextBox)sender).Text.IndexOf(".") >= 0)
            {
                if ((((TextBox)sender).SelectionStart) == (((TextBox)sender).Text.LastIndexOf('.')) + 1)
                {
                    if ((((TextBox)sender).Text.Length).ToString() == (((TextBox)sender).Text.IndexOf(".") + 3).ToString())
                        e.Handled = true;
                }
                if ((((TextBox)sender).SelectionStart) == (((TextBox)sender).Text.LastIndexOf('.')) + 2)
                {
                    if ((((TextBox)sender).Text.Length - 3).ToString() == ((TextBox)sender).Text.IndexOf(".").ToString()) e.Handled = true;
                }
            }

            if (e.KeyChar != (char)('.') && e.KeyChar != 8 && ((TextBox)sender).Text == "0")
            {
                e.Handled = true;
            }
        }