WinForm——记住密码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;
using System.IO;

namespace LoginAdmin
{
    class RWini
    {
        private string Path;

[DllImport("kernel32")]
        private static extern long WritePrivateProfileString(string section,string key,string val,string path);

[DllImport("kernel32")]
        private static extern int GetPrivateProfileString(string section,string key, string def, StringBuilder retVal, int size, string Path);

/// <summary>
        /// 构造函数
        /// </summary>
        /// <param name="INIPath"></param>
        public RWini(string INIPath)
        {
            Path=INIPath;
        }

/// <summary>
        /// 写入INI文件
        /// </summary>
        /// <param name="Section"></param>
        /// <param name="Key"></param>
        /// <param name="value"></param>
        public void WriteInivalue(string Section, string Key, string value)
        {
            File.SetAttributes(this.Path, FileAttributes.Normal);
            WritePrivateProfileString(Section, Key, value, this.Path);
            File.SetAttributes(this.Path, FileAttributes.ReadOnly);
        }

/// <summary>
        /// 读取INI文件
        /// </summary>
        /// <param name="Section"></param>
        /// <param name="Key"></param>
        /// <returns></returns>
        public string ReadInivalue(string Section, string Key)
        {
            StringBuilder temp = new StringBuilder(1024);
            int i = GetPrivateProfileString(Section, Key, "读取错误", temp, 1024, this.Path);
            return temp.ToString();
        }
    }
}

---

using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;
using Microsoft.Win32;

namespace LoginAdmin
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

private void Form1_Load(object sender, EventArgs e)
        {
            ReadINI();
            Roles();
            MessageBox.Show(textBox1.Text);
        }

private void Roles()
        {
            //文件操作读取-------StreamReader
            string filepath = "..\\..\\Roles.txt";
            StreamReader sr = new StreamReader(filepath, Encoding.Unicode);
            //string content = sr.ReadToEnd();//返回string
            string content = sr.ReadLine();
            sr.Close();

string[] arry = content.Split('\t');
            for (int i = 0; i < arry.Length; i++)
            {
                comboBox1.Items.Add(arry[i]);
            }
        }

/// <summary>
        /// 写入INI
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>

private void button1_Click(object sender, EventArgs e)
        {
            if (checkBox1.Checked == true)
            {
                string name = textBox1.Text;
                string password = textBox2.Text;
                string path = @"..\\..\\set.ini";
                RWini ini = new RWini(path);
                ini.WriteInivalue("mysystem", "username", name);
            }
        }

/// <summary>
        /// 读取ini
        /// </summary>
        private void ReadINI()
        {
            string path = Path.GetFullPath(@"..\\..\\set.ini");
            RWini ini = new RWini(path);
            textBox1.Text = ini.ReadInivalue("mysystem", "username");
        }

}

}

---

方法二：注册表

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;
using Microsoft.Win32;

namespace LoginAdmin
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

private void Form1_Load(object sender, EventArgs e)
        {
            Roles();
            HasRemember();
        }

private void button1_Click(object sender, EventArgs e)
        {
            if (checkBox1.Checked == true)
            {
                string name = textBox1.Text;
                string password = textBox2.Text;
                Remember(true, name, password);
            }
        }

/// <summary>
        /// 根据传入值记住密码
        /// </summary>
        /// <param name="remember">是否记录</param>
        /// <param name="userName">用户名</param>
        /// <param name="password">密码</param>
        private void Remember(bool remember,string userName,string password)
        {
            try{
                RegistryKey key=Registry.LocalMachine.OpenSubKey("SOFTWARE",true);
                key=key.CreateSubKey("CheckManage",RegistryKeyPermissionCheck.Default);
                if(remember)
                {
                    key.SetValue("username",userName);
                    key.SetValue("password",password);
                }
                else
                {
                    if(key.GetValue("username")!=null) key.DeleteValue("username");
                    if(key.GetValue("password")!=null) key.DeleteValue("password");
                }
            }
            catch
            {
            }
        }

/// <summary>
        /// 判断是否记住密码
        /// </summary>
        /// <returns></returns>
        private bool HasRemember()
        {
            try
            {
                RegistryKey key = Registry.LocalMachine.OpenSubKey("SOFTWARE\\CheckManage", true);
                object objU = key.GetValue("username");
                if (objU != null)
                {
                    this.textBox1.Text = objU.ToString();
                }
                object objP = key.GetValue("password");
                if (objP != null) this.textBox2.Text = objP.ToString();
                return objU != null && objP != null;
            }
            catch
            {
                return false;
            }
        }

private void Roles()
        {
            //文件操作读取-------StreamReader
            string filepath = "..\\..\\Roles.txt";
            StreamReader sr = new StreamReader(filepath, Encoding.Unicode);
            //string content = sr.ReadToEnd();//返回string
            string content = sr.ReadLine();
            sr.Close();

string[] arry = content.Split('\t');
            for (int i = 0; i < arry.Length; i++)
            {
                comboBox1.Items.Add(arry[i]);
            }
        }

}

}

---

总结：

方法一：写入数据库

方法二：写入文件——txt、xml、ini

方法三：注册表