dat保存登陆密码

  
    

   
     winform
   
     --
   
     记住密码 收藏 

要引用IO包


   
     private
   
      
   
     string
   
      accountFilePath 
   
     =
   
      Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData) 
   
     +
   
     "
   
     \\accounts.dat 
   
     "
   
     ;


   
     private
   
      IDictionary
   
     <
   
     string
   
     , 
   
     string
   
     >
   
      accounts 
   
     =
   
      
   
     new
   
      SortedList
   
     <
   
     string
   
     , 
   
     string
   
     >
   
     ();


   
     ///
   
      
   
     <summary>
   
     
 
   
     ///
   
      记住密码
 
   
     ///
   
      
   
     </summary>
   
     

   
      
   
     private
   
      
   
     void
   
      ReloadAccounts()
 {
 
   
     this
   
     .txtUserName.AutoCompleteCustomSource.Clear();
 accounts.Clear();
 
   
     if
   
      (
   
     !
   
     File.Exists(accountFilePath))
 {
 
   
     return
   
     ;
 }
 
   
     using
   
      (StreamReader reader 
   
     =
   
      
   
     new
   
      StreamReader(accountFilePath))
 {
 
   
     while
   
      (
   
     true
   
     )
 {
 
   
     string
   
      username 
   
     =
   
      reader.ReadLine();
 
   
     if
   
      (
   
     string
   
     .IsNullOrEmpty(username)) 
   
     break
   
     ;
 
   
     string
   
      password 
   
     =
   
      reader.ReadLine();
 
   
     if
   
      (
   
     string
   
     .IsNullOrEmpty(password)) 
   
     break
   
     ;
 accounts.Add(username, password);
 txtUserName.AutoCompleteCustomSource.Add(username);
 }
 }
 }


   
     ///
   
      
   
     <summary>
   
     
 
   
     ///
   
      登录事件
 
   
     ///
   
      
   
     </summary>
   
     
 
   
     ///
   
      
   
     <param name="sender"></param>
   
     
 
   
     ///
   
      
   
     <param name="e"></param>
   
     

   
      
   
     private
   
      
   
     void
   
      btnLogin_Click(
   
     object
   
      sender, EventArgs e)
 {
 
   
     if
   
      (accounts.ContainsKey(
   
     this
   
     .txtUserName.Text))
 {
 accounts[
   
     this
   
     .txtUserName.Text] 
   
     =
   
      
   
     this
   
     .txtUserPass.Text;
 }
 
   
     else
   
     
 {
 accounts.Add(
   
     this
   
     .txtUserName.Text, 
   
     this
   
     .txtUserPass.Text);
 }

 
   
     using
   
      (StreamWriter writer 
   
     =
   
      
   
     new
   
      StreamWriter(accountFilePath))
 {
 
   
     foreach
   
      (KeyValuePair
   
     <
   
     string
   
     , 
   
     string
   
     >
   
      account 
   
     in
   
      accounts)
 {
 writer.WriteLine(account.Key);
 writer.WriteLine(account.Value);
 }
 }

 ReloadAccounts();

 
   
     string
   
      user 
   
     =
   
      
   
     this
   
     .txtUserName.Text.Trim(); 
 
   
     //
   
     加密
   
     

   
      
   
     string
   
      bbb 
   
     =
   
      Crypto.EncryptData(
   
     "
   
     jm
   
     "
   
     , 
   
     this
   
     .txtUserPass.Text.Trim());
 
   
     string
   
      pwd 
   
     =
   
      bbb;

 
   
     string
   
      filter 
   
     =
   
      
   
     "
   
     username='
   
     "
   
      
   
     +
   
      user 
   
     +
   
      
   
     "
   
     '
   
     "
   
      
   
     +
   
      
   
     "
   
      and password='
   
     "
   
      
   
     +
   
      pwd 
   
     +
   
      
   
     "
   
     '
   
     "
   
     ;

 DataTable loginTable 
   
     =
   
      manager.selectAll(
   
     "
   
     userlist
   
     "
   
     , 
   
     "
   
     *
   
     "
   
     , filter);

 
   
     if
   
      (
   
     this
   
     .txtUserName.Text.Trim() 
   
     ==
   
      
   
     ""
   
      
   
     ||
   
      bbb 
   
     ==
   
      
   
     ""
   
     )
 {
 MessageBox.Show(
   
     "
   
     用户名或密码不能为空！
   
     "
   
     );
 
   
     this
   
     .txtUserName.Focus();
 }
 
   
     else
   
      
   
     if
   
      (loginTable.Rows.Count 
   
     ==
   
      
   
     0
   
     )
 {
 MessageBox.Show(
   
     "
   
     用户名或密码错误！
   
     "
   
     );
 
   
     this
   
     .txtUserName.Focus();
 }
 
   
     else
   
     
 {
 MessageBox.Show(
   
     "
   
     登录成功！
   
     "
   
     );
 }
 } 

 
   
     //
   
     当鼠标离开用户名时自动获得密码
   
     

   
      
   
     private
   
      
   
     void
   
      txtUserName_Leave(
   
     object
   
      sender, EventArgs e)
 {
 
   
     string
   
      password 
   
     =
   
      
   
     string
   
     .Empty;
 
   
     if
   
      (accounts.TryGetValue(
   
     this
   
     .txtUserName.Text, 
   
     out
   
      password))
 
   
     this
   
     .txtUserPass.Text 
   
     =
   
      password;
 }



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     //
   
     blog.csdn.net/zhangjianjianjianjia/archive/2009/11/06/4776397.aspx