using System; 

using System.Collections.Generic; 

using System.ComponentModel; 

using System.Drawing; 

using System.Data; 

using System.Linq; 

using System.Text; 

using System.Windows.Forms; 

  

namespace Pwd 

{ 

    public partial class CheckPwdStrength : UserControl 

    { 

        public CheckPwdStrength() 

        { 

            InitializeComponent(); 

        } 

  

        private string _pssword = string.Empty; 

  

        /// <summary> 

        /// 密码 

        /// </summary> 

        [Description(" 密码" ), Category(" 密码验证设置" ), Browsable(true)] 

        public string Pssword 

        { 

            get { return _pssword; } 

            set 

            { 

                _pssword = value; 

                // 执行密码强度验证 

                CheckPwd(); 

            } 

        } 

  

        #region   检查密码强度 

  

        /// <summary> 

        /// 检查字符是属于哪一类 

        /// </summary> 

        /// <param name="_in"></param> 

        /// <returns></returns> 

        private int CharMode(int _in) 

        { 

            if (_in >= 48 && _in <= 57) // 数字   

                return 1; 

            if (_in >= 65 && _in <= 90) // 大写字母   

                return 2; 

            if (_in >= 97 && _in <= 122) // 小写   

                return 4; 

            else 

                return 8; // 特殊字符   

        } 

  

        /// <summary> 

        /// 计算出当前密码当中一共有多少种模式 

        /// </summary> 

        /// <param name="_num"></param> 

        /// <returns></returns> 

        private int BitTotal(int _num) 

        { 

            int modes = 0; 

            for (int i = 0; i < 4; i++) 

            { 

                // 逐位运算 

                if ((_num & 1) == 0) 

                    modes++; 

                // 右移位运算 

                _num >>= 1; 

            } 

            return modes; 

        } 

  

        /// <summary> 

        /// 检查强度，返回密码的强度级别 

        /// </summary> 

        /// <param name="_pwd"></param> 

        /// <returns></returns> 

        private int CheckStrong(string _pwd) 

        { 

            // 判断密码长度是否大于6位 

            if (_pwd.Length <= 6) 

            { 

                return 0; // 密码太短   

            } 

            else 

            { 

                int Modes = 0; 

                for (int i = 0; i < _pwd.Length; i++) 

                { 

                    // 获取密码字符串字节数组 

                    byte[] by_pwd = System.Text.Encoding.Default.GetBytes(_pwd); 

                    // 或赋值运算 

                    Modes |= CharMode(by_pwd[i]); 

                } 

                return BitTotal(Modes); 

            } 

        } 

  

        #endregion 

  

        #region   执行密码强度验证 

  

        /// <summary> 

         /// 执行密码强度验证 

        /// </summary> 

        private void CheckPwd() 

        { 

            if (Pssword.Trim().ToString().Length == 0) 

            { 

                // 弱 

                lblWeak.Visible = false;