.net c# TextBox只能输入整数或小数

.net c# winform TextBox 限制只能输入整数或小数

只需要处理 KeyPress 事件即可,代码如下

        private void ztxtthere_KeyPress(object sender, KeyPressEventArgs e)
        {
            if (char.IsNumber(e.KeyChar)) { e.Handled = false; }
            else
            {
                string str = ztxtthere.Text;
                if (e.KeyChar == Convert.ToChar("。") || e.KeyChar == Convert.ToChar("."))
                {
                    int i_d = 0;
                    for (int i = 0; i < str.Length; i++)
                    {
                        if (str.Substring(i, 1) == ".")
                        {
                            e.Handled = true;
                            i_d++;
                            return;
                        }
                    }
                    if (i_d == 0)
                    {
                        e.KeyChar = Convert.ToChar(".");
                        e.Handled = false;
                    }
                }
                else if (e.KeyChar == '\b') { e.Handled = false; }
                else { e.Handled = true; }
            }
        }

        private void ztxtfour_KeyPress(object sender, KeyPressEventArgs e)
        {
            if (!char.IsDigit(e.KeyChar) && e.KeyChar != '\b' && e.KeyChar != '.')
            {
                e.Handled = true;  //非以上键则禁止输入
            }
            string str = ztxtfour.Text;
            if (e.KeyChar == '0' && str.Trim() == "") e.Handled = true; //禁止第一个字符就输入0
            if (e.KeyChar == '.' && str.Trim() == "") e.Handled = true; //禁止第一个字符就输入小数点
            if (e.KeyChar == '.' && str.Contains(".")) e.Handled = true; //禁止输入多个小数点
        }