C# 如何实现记住用户名和密码？

Question

C#中如何实现记住登陆窗口中的用户名和密码信息呢？当我退出程序后，再次打开程序，用户名和密码框记录上次登录时输入的内容。求解、、给个详细代码更好了~

Answer 1

可以放在用户范围(User Scrope)的配置中(Settings.Settings)。
也可以放在注册表HKCU（当前用户）下。当然最好加密保存。

Answer 2

使用cookie
                        HttpCookie cookie_name = new HttpCookie("name");
                        HttpCookie cookie_code = new HttpCookie("code");
                        cookie_name.Value = TextMobile.Text.Trim();
                        cookie_code.Value = TextCode.Text.Trim();
                        cookie_name.Expires = DateTime.Now.AddYears(1);
                        cookie_code.Expires = DateTime.Now.AddYears(1);
                        Response.Cookies.Add(cookie_name);
                        Response.Cookies.Add(cookie_code);

Answer 3

保存信息到app.config或XML，再下次登录时查询app.config或XML获取密码
自定义类，通过静态属性

Answer 4

楼上正解 一般保存到app.config中，Cookie 也可以

Answer 5

你先讲清楚是桌面程序还是Web程序...机制都不一样，方法也不一样...

Answer 6

呵呵，抱歉的说下，不是Web程序，是手机端程序...

Answer 7

//判断是否保存
               if (checkBoxSave.Checked)
                {
                        SaveUserDefault(txtBoxLocation.Text, txtBoxUsername.Text, txtBoxPassword.Text,
                        cboBoxRole.Text);
                }
                else
                {
                        DeleteUserDefault();
                }
//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)
            {
                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 = RegistryAccess.GetStringRegistryValue("sys_info" + (i + 1).ToString(), dedault);
                }
            }
            catch (System.Exception ex)
            {
                userInfo = null;
            }
            return userInfo;
            
        }//注册表操作
// Method for retrieving a Registry Value.
        static public string GetStringRegistryValue(string key, string defaultValue)
        {
            RegistryKey rkCompany;
            RegistryKey rkApplication;            rkCompany = Registry.CurrentUser.OpenSubKey(SOFTWARE_KEY, false).OpenSubKey(COMPANY_NAME, false);
            if (rkCompany != null)
            {
                rkApplication = rkCompany.OpenSubKey(APPLICATION_NAME, true);
                if (rkApplication != null)
                {
                    foreach (string sKey in rkApplication.GetValueNames())
                    {
                        if (sKey == key)
                        {
                            return (string)rkApplication.GetValue(sKey);
                        }
                    }
                }
            }
            return defaultValue;
        }        // Method for storing a Registry Value.
        static public void SetStringRegistryValue(string key, string stringValue)
        {
            RegistryKey rkSoftware;
            RegistryKey rkCompany;
            RegistryKey rkApplication;            rkSoftware = Registry.CurrentUser.OpenSubKey(SOFTWARE_KEY, true);
            rkCompany = rkSoftware.CreateSubKey(COMPANY_NAME);
            if (rkCompany != null)
            {
                rkApplication = rkCompany.CreateSubKey(APPLICATION_NAME);
                if (rkApplication != null)
                {
                    rkApplication.SetValue(key, stringValue);
                }
            }
        }        static public void DeleteRegistryValue(string key)
        {
            RegistryKey rkSoftware;
            RegistryKey rkCompany;
            RegistryKey rkApplication;            rkSoftware = Registry.CurrentUser.OpenSubKey(SOFTWARE_KEY, true);
            rkCompany = rkSoftware.OpenSubKey(COMPANY_NAME,true);
            if (rkCompany != null)
            {
                rkApplication = rkCompany.OpenSubKey(APPLICATION_NAME,true);
                if (rkApplication != null)
                {
                    rkApplication.DeleteValue(key);
                }
            }
            //Registry.CurrentUser.DeleteSubKey(key) ;
        }//可以自己加密一下

Answer 8

把登陆名称和密码保存到Cookie里面，页面打开时，读取Cookie显示在输入框里就可以。
写cookie
HttpCookie cookie = new HttpCookie("Info");//定义cookie对象以及名为Info的项
DateTime dt = DateTime.Now;//定义时间对象
TimeSpan ts=new TimeSpan(1,0,0,0);//cookie有效作用时间，具体查msdn
cookie.EXPires = dt.Add(ts);//添加作用时间
cookie.Values.Add("userid","aaa");//增加属性
cookie.Values.Add("password","bbbb");
Response.AppendCookie(cookie);//确定写入cookie中 
  读取cookie
if(Request.Cookies["Info"]!=null)
{
     string userId=Convert.ToString(Request.Cookies["Info"].Values["userid"]);
     string password=Convert.ToString(Request.Cookies["Info"].Values["password"]);
}

Answer 9

把用户名密码保存到本地文件，如xml或ini文件，txt都可以...记得要加密...每次启动时，从文件读取信息填充登录界面即可...没啥难度啊...

Answer 10

想记住用户名和密码就得把信息保存在哪个地方.这些地方可以是: 用户配置文件\XML文件\TXT\INI\注册表\任何你可以写入并读取的文件...最关键的是加密.