C#记住密码功能实现

来源：互联网发布：企业管理短信群发软件编辑：程序博客网时间：2024/05/06 06:48

无聊玩玩的小功能，希望给初学者带来一点点的激情，实现记住密码功能

首先创建一个类User.cs（用来编辑和获取用户名和密码）

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace 记住密码
{
[Serializable]
public class User
{
//#region 用户名
//private string loginId;
//public string LoginID
//{
// get { return loginId; }
// set { loginId = value; }
//}
//#endregion

//#region 用户密码
//private string pwd;
//public string Pwd
//{
// get { return pwd; }
// set { pwd = value; }
//}
//#endregion

public string LoginID { get; set; }
public string Pwd { get; set; }

}
}

接着创建一个窗体Form1.cs（显示和保存）

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.Runtime.InteropServices;
using System.Runtime.Serialization.Formatters.Binary;
using System.IO;

namespace 记住密码
{
public partial class Form1 : Form
{
Dictionary<string, User> dic = new Dictionary<string, User>();
private int len =0;
public Form1()
{
InitializeComponent();
}

private void button1_Click(object sender, EventArgs e)
{
if (MessageBox.Show("确定要退出吗？", "系统温馨提示", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes)
{
this.Close();
}

}

#region 窗体加载
/// <summary>
/// 窗体加载的时候获取data里面的账号
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void Form1_Load(object sender, EventArgs e)
{

User u = new User();
FileStream fs = new FileStream("data.txt", FileMode.OpenOrCreate);
if (fs.Length > 0)
{
BinaryFormatter bf = new BinaryFormatter();
dic = bf.Deserialize(fs) as Dictionary<string,User>;
foreach (var User in dic.Values)
{
comboBox1.Items.Add(User.LoginID);
}
if (comboBox1.Items.Count > 0)
{
comboBox1.SelectedIndex = comboBox1.Items.Count - 1;
}
}
fs.Close();
len = Convert.ToInt32( comboBox1.Text.Length);
}
#endregion
#region 登录按钮事件
/// <summary>
/// 单击按钮的时候判断是否保存用户信息，根据checkBox的chenck判断
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void button2_Click(object sender, EventArgs e)
{
User u = new User();
FileStream fs = new FileStream("data.txt", FileMode.Create);//文件创建
BinaryFormatter bf = new BinaryFormatter();//序列化
u.LoginID = comboBox1.Text.Trim();
if (checkBox1.Checked)
{
u.Pwd = textBox1.Text.Trim();
}
else
{
u.Pwd = "";
}
//判断字典中是否有相同的用户名，如果有，就移除字典中的用户名
if (dic.ContainsKey(u.LoginID))
{
dic.Remove(u.LoginID);
}
dic.Add(u.LoginID, u);
bf.Serialize(fs, dic);
fs.Close();

#region
//把保存的用户显示在控件中
FileStream Openfs = new FileStream("data.txt", FileMode.OpenOrCreate);
if (Openfs.Length > 0)
{
dic = bf.Deserialize(Openfs) as Dictionary<string, User>;

comboBox1.Items.Add(comboBox1.Text);

if (comboBox1.Items.Count > 0)
{
comboBox1.SelectedIndex = comboBox1.Items.Count - 1;
}
}
Openfs.Close();
#endregion

MessageBox.Show("登录成功！");

}
#endregion
#region 验证字典中是否有相同的用户名
/// <summary>
///
/// </summary>
public void DisplayUserInfo()
{

string key = comboBox1.Text.Trim();
if (dic.ContainsKey(key)==false)
{
return;
}
User u = dic[key];
textBox1.Text = u.Pwd.Trim();
checkBox1.Checked = comboBox1.Text.Trim().Length > 0 ? true : false;
}
#endregion

#region 更改属性值的时候触发
/// <summary>
///
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
DisplayUserInfo();
}
#endregion

private void comboBox1_TextChanged(object sender, EventArgs e)
{

if (len != Convert.ToInt32(comboBox1.Text.Length))
{
textBox1.Text = "";
DisplayUserInfo();

}
else
{
DisplayUserInfo();
}


}
}
}

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