1、在程序加载的时候，取消文本框的自动换行，以及让两个按钮和文本框隐藏。
    2、点击登陆，判断是否登陆成功。
    3、自动换行功能。
    4、保存文本到一个指定目录下。

    image.png

    1. public partial class Form1 : Form
    2.     {
    3.         public Form1()
    4.         {
    5.             InitializeComponent();
    6.         }
    8.         private void textBox1_TextChanged(object sender, EventArgs e)
    9.         {
    11.         }
    13.         private void Form1_Load(object sender, EventArgs e)
    14.         {
    15.             txtWords.WordWrap = false;
    16.             btnWordWarp.Visible = false;
    17.             btnSave.Visible = false;
    18.             txtWords.Visible = false;
    19.             btnClose.Visible = false;
    20.         }
    22.         /// <summary>
    23.         /// ,用户点击登陆，判断是否登陆成功
    24.         /// </summary>
    25.         /// <param name="sender"></param>
    26.         /// <param name="e"></param>
    27.         private void btnLogin_Click(object sender, EventArgs e)
    28.         {
    29.             string name = txtName.Text.Trim();
    30.             string pwd = txtPwd.Text;
    31.             if (name == "admin" && pwd == "888888")
    32.             {
    33.                 MessageBox.Show("欢迎使用 <微咲> 简单记事本！");
    34.                 btnWordWarp.Visible = true;
    35.                 btnSave.Visible = true;
    36.                 txtWords.Visible = true;
    37.                 btnClose.Visible = true;
    39.                 lblName.Visible = false;
    40.                 lblPwd.Visible = false;
    41.                 txtName.Visible = false;
    42.                 txtPwd.Visible = false;
    43.                 btnLogin.Visible = false;
    44.                 btnReset.Visible = false;
    45.                 btnClose1.Visible = false;
    46.             }
    47.             else  //登陆失败
    48.             {
    49.                 MessageBox.Show("用户名或密码错误，请重新登陆！");
    50.                 //用户输入失败后，清空两个文本框
    51.                 txtName.Clear();
    52.                 txtPwd.Clear();
    53.                 //让焦点到TxtName中
    54.                 txtName.Focus();
    55.             }
    56.         }
    58.         /// <summary>
    59.         /// 用户点击重置
    60.         /// </summary>
    61.         /// <param name="sender"></param>
    62.         /// <param name="e"></param>
    63.         private void btnReset_Click(object sender, EventArgs e)
    64.         {
    65.             //用户点击重置后，清空两个文本框
    66.             txtName.Clear();
    67.             txtPwd.Clear();
    68.             //让焦点到TxtName中
    69.             txtName.Focus();
    70.         }
    72.         /// <summary>
    73.         /// 自动换行
    74.         /// </summary>
    75.         /// <param name="sender"></param>
    76.         /// <param name="e"></param>
    77.         private void btnWordWarp_Click(object sender, EventArgs e)
    78.         {
    79.             //当前是否自动换行
    80.             if (btnWordWarp.Text=="自动换行")
    81.             {
    82.                 //取消自动换行
    83.                 txtWords.WordWrap = true;
    84.                 btnWordWarp.Text = "取消自动换行";
    85.             }
    86.             else if(btnWordWarp.Text == "取消自动换行")
    87.             {
    88.                 txtWords.WordWrap = false;
    89.                 btnWordWarp.Text = "自动换行";
    90.             }
    91.         }
    93.         /// <summary>
    94.         /// 保存文本
    95.         /// </summary>
    96.         /// <param name="sender"></param>
    97.         /// <param name="e"></param>
    98.         private void btnSave_Click(object sender, EventArgs e)
    99.         {
    100.             using (FileStream fsWrite = new FileStream(@"C:\Users\46124\Desktop\记事本.txt", FileMode.Append, FileAccess.Write))
    101.             {
    102.                 string userInput = txtWords.Text.Trim()+"\n";
    103.                 byte[] buffer = System.Text.Encoding.Default.GetBytes(userInput);
    104.                 fsWrite.Write(buffer, 0, buffer.Length);
    105.             }
    106.             MessageBox.Show("保存成功");
    107.         }
    109.         private void btnClose_Click(object sender, EventArgs e)
    110.         {
    111.             this.Close();
    112.         }
    114.         private void btnClose1_Click(object sender, EventArgs e)
    115.         {
    116.             this.Close();
    117.         }
    118.     }