C# 正则表达式限制输入-蒲公英云

C# 正则表达式限制输入

清疚 2023-10-18 19:30 213阅读 0赞

Winform 中：

建立一个类，方便以后使用，内容如下：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Text.RegularExpressions;
namespace UI
{
    public class TextSet
    {
        /// <summary>
        /// 限制只可输入数字
        /// </summary>
        /// <param name="e"></param>
        public static void setNumber(KeyPressEventArgs e)
        {
            if (e.KeyChar != '\b' && !Char.IsDigit(e.KeyChar))
            {
                e.Handled = true;
                MessageBox.Show("请输入数字！");
                return;
            }
        }
        /// <summary>
        /// 限制只能输入汉字或字母
        /// </summary>
        /// <param name="c"></param>
        public static void setChinese(KeyPressEventArgs e)
        {
            Regex rg = new Regex(@"^[\u4e00-\u9fa5a-zA-Z\b]+$"); //\b是退格键
            if (!rg.IsMatch(e.KeyChar.ToString()))
            {
                e.Handled = true;
                MessageBox.Show("只能输入汉字或字母！");
                return;
            }
        }
        /// <summary>
        /// 只能输入字母或数字
        /// </summary>
        /// <param name="e"></param>
        public static void setEnglishOrNum(KeyPressEventArgs e)
        {
            if ((e.KeyChar >= 'a' && e.KeyChar <= 'z') || (e.KeyChar >= 'A' && e.KeyChar <= 'Z')
   || (e.KeyChar >= '0' && e.KeyChar <= '9') || (e.KeyChar == 8))
            {
                e.Handled = false;
            }
            else
            {
                e.Handled = true;
                MessageBox.Show("密码只能是字母或者数字！");
                return;
            }
        }
    }
}

针对 Textbox 中的事件：

private void txtUserID_KeyPress(object sender, KeyPressEventArgs e)
    {
        TextSet.setNumber(e);
    }

WPF 中：

建立一个类，方便以后使用，内容如下：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using System.Windows.Input;
namespace UI
{
    public class Limit
    {
        /// <summary>
        /// 限制只能输入数字
        /// </summary>
        /// <param name="e"></param>
        public void limitnumber(TextCompositionEventArgs e)
        {
            Regex re = new Regex("[^0-9]+");
            e.Handled = re.IsMatch(e.Text);
        }
        /// <summary>
        /// 限制只能输入数字1到7
        /// </summary>
        /// <param name="e"></param>
        public bool limitnumberOneToServen(TextCompositionEventArgs e)
        {
            Regex re = new Regex("[^1-7]+");
            e.Handled = re.IsMatch(e.Text);
            return e.Handled;
        }
        /// <summary>
        /// 限制只能输入数字和小数点
        /// </summary>
        /// <param name="e"></param>
        public void limitnumber1(TextCompositionEventArgs e)
        {
            Regex re = new Regex("[^0-9.]+");
            e.Handled = re.IsMatch(e.Text);
        }
    }
}

针对 Textbox 中的事件：

private void TxtBoxID_PreviewTextInput(object sender, TextCompositionEventArgs e)
        {
            Limit limit = new Limit();
            limit.limitnumber(e);
        }