【源码】仿qq记住登录信息

注册表操作类

using System;
using System.Collections.Generic;
using System.Text;
using Microsoft.Win32;
using System.Security.AccessControl;
namespace Zone
{
    /// <summary>
    /// 类似qq一样保存当前登录用户的信息
    /// </summary>
    public class SaveUserPwd
    {
        private static string _CompanyName="PuTian_Ltd";
        private static string _ApplicationName = "PT_SmsSend";

        /// <summary>
        /// 设置注册表项的公司名称
        /// </summary>
        public string CompanyName
        {
            set { _CompanyName = value; }
            get { return _CompanyName; }
        }

        /// <summary>
        /// 设置应用程序的名称
        /// </summary>
        public string ApplicationName
        {
            set { _ApplicationName = value; }
            get { return _ApplicationName; }
        }

        
        //保存用户信息 
        public void SaveUserDefault(string location, string username, string pwd, string role)
        {
            try
            {
                SetStringRegistryValue("sys_info1", location);
                SetStringRegistryValue("sys_info2", username);
                SetStringRegistryValue("sys_info3", pwd); 
                SetStringRegistryValue("sys_info4", role);
            }
            catch (System.Exception ex)
            {
                throw ex;
                //InfoHandler.ShowException(ex);
            }
        }
        public void DeleteUserDefault()
        {
            try
            {
                DeleteRegistryValue("sys_info1");
                DeleteRegistryValue("sys_info2");
                DeleteRegistryValue("sys_info3");
                DeleteRegistryValue("sys_info4");
            }
            catch (System.Exception ex)
            {

            }
        }
        /// 获取用户保存的登录信息     
        public string[] LoadUserDefault()
        {
            string[] userInfo = new string[4];
            try
            {
                for (int i = 0; i < 4; i++)
                {
                    string dedault = "";
                    string value = GetStringRegistryValue("sys_info" + (i + 1).ToString(), dedault);

                }
            }
            catch (System.Exception ex)
            {
                userInfo = null;
            }
            return userInfo;
        }

        //注册表操作
        public string GetStringRegistryValue(string key, string defaultValue)
        {
            RegistryKey rkCompany;
            RegistryKey rkApplication;
            rkCompany = Registry.CurrentUser.OpenSubKey("SOFTWARE", false).OpenSubKey(_CompanyName, false);
            if (rkCompany != null)
            {
                rkApplication = rkCompany.OpenSubKey(_ApplicationName, true);
                if (rkApplication != null)
                {
                    foreach (string sKey in rkApplication.GetValueNames())
                    {
                        if (sKey == key)
                        {
                            return (string)rkApplication.GetValue(sKey);

                        }

                    }
                }
            }
            return defaultValue;
        }



        public void DeleteRegistryValue(string key)
        {
            RegistryKey rkSoftware;
            RegistryKey rkCompany;
            RegistryKey rkApplication;
            rkSoftware = Registry.CurrentUser.OpenSubKey("SOFTWARE", true);
            if (rkSoftware == null)
            {
                Registry.CurrentUser.CreateSubKey("SOFTWARE");
            }
            rkCompany = rkSoftware.OpenSubKey(_CompanyName, true);
            if (rkCompany != null)
            {
                rkApplication = rkCompany.OpenSubKey(_ApplicationName, true);
                if (rkApplication != null)
                {
                    rkApplication.DeleteValue(key);
                }
            }
            //Registry.CurrentUser.DeleteSubKey(key) ;  
        }

        /// <summary>
        /// 通用使用时，注意PuTianHuaXin变量的改变
        /// </summary>
        /// <param name="key"></param>
        /// <param name="stringValue"></param>
        public void SetStringRegistryValue(string key, string stringValue)
        {
            RegistryKey rkSoftware;
            RegistryKey rkCompany;
            RegistryKey rkApplication;
            rkSoftware = Registry.CurrentUser.OpenSubKey("SOFTWARE", true);
            if (rkSoftware == null)
            {
                Registry.CurrentUser.CreateSubKey("SOFTWARE");
            }
            rkCompany = rkSoftware.CreateSubKey(_CompanyName);
            if (rkCompany != null)
            {
                rkApplication = rkCompany.CreateSubKey(_ApplicationName);
                if (rkApplication != null)
                {                    
                    rkApplication.SetValue(key, stringValue);
                }
            }
        } 
    }
}

调用的方法   

       void SaveUserPwds()
        {
                       

            if (checkBox1.Checked)
            {
                saveUserPwd.SaveUserDefault("show", textBox1.Text.Trim(), DESEncrypt.Encrypt(textBox2.Text.Trim

(),"putiansms"), "用户");
            }
            else
            {
                saveUserPwd.DeleteUserDefault();
            } 
        }
        void LoadUserAndPwd()
        {
            string Show = saveUserPwd.GetStringRegistryValue("sys_info1", "");
            if (Show == "show") checkBox1.Checked = true;
            textBox1.Text = saveUserPwd.GetStringRegistryValue("sys_info2", "");
            textBox2.Text = DESEncrypt.Decrypt(saveUserPwd.GetStringRegistryValue("sys_info3", ""), "putiansms");
        }