using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Runtime.Serialization.Formatters.Binary;

namespace Test
{
    [Serializable]
    public class Config
    {
        private static object objLock = new object();
        private const string CONFIG_FILE = "Config.dat";
        private static Config instance = new Config();

        private Config() { }
        private string  _name;
        private string  _pwd;
        public static string UserName
        {
            set { instance._name = value; }
            get { return instance._name; }
        }

        /// <summary>
        ///  密码 （加密）
        /// </summary>
        public static string UserPwd
        {
            set { instance._pwd = value; }
            get { return instance._pwd; }
        }

        private void Serialize()
        {
            try
            {
                FileStream fileStream = new FileStream(AppDomain.CurrentDomain.BaseDirectory + CONFIG_FILE, FileMode.OpenOrCreate, FileAccess.ReadWrite);
                BinaryFormatter b = new BinaryFormatter();
                b.Serialize(fileStream, this);
                fileStream.Close();
            }
            catch (Exception ex)
            {

            }
        }

        private bool UnSerialize()
        {
            try
            {
                if (File.Exists(AppDomain.CurrentDomain.BaseDirectory + CONFIG_FILE))
                {
                    FileStream fileStream = new FileStream(AppDomain.CurrentDomain.BaseDirectory + CONFIG_FILE, FileMode.Open, FileAccess.Read, FileShare.Read);
                    BinaryFormatter b = new BinaryFormatter();
                    Config c = (Config)b.Deserialize(fileStream);
                    this._name = c._name;
                    this._pwd = c._pwd;
                    fileStream.Close();
                    return true;
                }
            }
            catch (Exception ex)
            {

            }
            return false;
        }

        /// <summary>
        /// 保存系统设定
        /// </summary>
        public static void Save()
        {
            instance.Serialize();
        }

        /// <summary>
        /// 载入系统初始化设定
        /// </summary>
        public static void Load()
        {
            if (!instance.UnSerialize())
            {
                instance._name = string.Empty;
                instance._pwd = string.Empty;
                instance.Serialize();
            }
            instance.UnSerialize();
        }
    }
}
// 保存
Config.UserName = "Leon382";
Config.UserPwd="**********"
Config.Save();

// 取用
Config.Load();
string pwd=Config.UserPwd;

------解决方案--------------------
學習了
探讨

C# code

using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Runtime.Serialization.Formatters.Binary;

namespace Test
{
    [Serializable]
    p……


------解决方案--------------------
保存本地加密文件，打开的时候读取。

------解决方案--------------------
写文件 读文件 加密

------解决方案--------------------
添加项，选择Settings。

------解决方案--------------------
用户名和密码加密，写到本地，下次登录时从本地读取，解密，显示用户名和密码

------解决方案--------------------