C#中身份证验证的功能模块(18位)

来源：互联网发布：软件打包编辑：程序博客网时间：2024/06/04 08:13

一段简单的身份证校验代码，由身份证的前17位计算第18位是否合法，作为处理身份证号的第一步。

具体算法参看：百度百科

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Windows.Forms;namespace IdCard{    public partial class Form1 : Form    {        public Form1()        {            InitializeComponent();        }        private bool CheckId(string id) {            int[] wQuan={7,9,10,5,8,4,2,1,6,3,7,9,10,5,8,4,2};            string checkWei = "10X98765432";            string number17 = id.Substring(0, 17);            string number18 = id.Substring(17);            int sum=0;            for (int i = 0; i < 17; i++) {                sum+=Convert.ToInt32(number17[i].ToString()) * wQuan[i];            }            int mod = sum % 11;            string result = checkWei[mod].ToString();            return (number18.Equals(result, StringComparison.OrdinalIgnoreCase));        }        private void button1_Click(object sender, EventArgs e)        {            string id = txtId.Text.Trim();            if (id.Length == 18) {                if (this.CheckId(id))                {                    MessageBox.Show("合法");                }                else {                    MessageBox.Show("不合法");                }            }            else            {                MessageBox.Show("身份证号码输入有误！");                return;            }        }        private void txtId_KeyPress(object sender, KeyPressEventArgs e)        {            if (e.KeyChar < '0' || e.KeyChar > '9') {                e.Handled = true;                //阻止数字以外字符            }            if ((txtId.SelectionStart == 17)&& (e.KeyChar == 'x' || e.KeyChar == 'X')) {                e.Handled = false;                //允许第18位为x/X            }            if (e.KeyChar == 8)            {                e.Handled = false;                //允许backspace输入            }        }    }}

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