用c# 编写 初始化：生成一个大小为n的数组，随机初始化其中[1, n]个数字，并按数字升序排列图形并显示。 专注力训练：生成一个大小为m*m的矩阵，用随机图片填满方阵中的每个位置。每个图片下方设置一个文本框，用户可以输入数字。计时开始，并显示所用时间。当用户点击结束按钮时，计时结束，显示本次用时和正确率（正确标准：用户输入数字与初始化时图片对应数字相同）。 历史记录：使用数据库或文件记录每个n和m下的最好成绩。查询不同n和m时，查询历史最好成绩。查询某一n和某一m时，查询该n和m下所有的历史成绩。

以下是用 C# 编写的示例代码，实现了上述三个功能：

1. 生成并显示初始化数组

static void Main(string[] args)
{
    int n = 10;
    int[] arr = new int[n];
    Random random = new Random();
    int numCount = random.Next(1, n+1);
    for (int i = 0; i < numCount; i++)
    {
        int num = random.Next(1, n+1);
        while (Array.IndexOf(arr, num) >= 0)
        {
            num = random.Next(1, n+1);
        }
        arr[i] = num;
    }
    Array.Sort(arr);
    foreach (int num in arr)
    {
        Console.Write(num + " ");
    }
}

2. 生成并显示矩阵，并计时用户输入和正确率

static void Main(string[] args)
{
    int m = 5;
    Bitmap[] images = new Bitmap[m * m];
    for (int i = 0; i < m * m; i++)
    {
        images[i] = new Bitmap("image" + i + ".jpg");
    }
    int correctCount = 0;
    Stopwatch stopwatch = new Stopwatch();
    stopwatch.Start();
    for (int i = 0; i < m * m; i++)
    {
        PictureBox pictureBox = new PictureBox();
        pictureBox.Image = images[i];
        pictureBox.SizeMode = PictureBoxSizeMode.StretchImage;
        pictureBox.BorderStyle = BorderStyle.FixedSingle;
        TextBox textBox = new TextBox();
        textBox.Width = pictureBox.Width;
        textBox.Top = pictureBox.Bottom;
        textBox.KeyPress += (sender, e) =>
        {
            if (e.KeyChar == (char)Keys.Enter)
            {
                int inputNum;
                if (int.TryParse(textBox.Text, out inputNum))
                {
                    if (inputNum == i + 1)
                    {
                        correctCount++;
                    }
                }
                pictureBox.Enabled = false;
                textBox.Enabled = false;
                if (correctCount == m * m)
                {
                    stopwatch.Stop();
                    MessageBox.Show("用时：" + stopwatch.ElapsedMilliseconds / 1000.0 + "秒，正确率：" + (correctCount * 100.0 / (m * m)) + "%");
                }
            }
        };
        pictureBox.Controls.Add(textBox);
        pictureBox.Left = (i % m) * pictureBox.Width;
        pictureBox.Top = (i / m) * pictureBox.Height;
        pictureBox.Parent = this;
    }
}

3. 使用 SQLite 数据库记录历史成绩

static void Main(string[] args)
{
    string dbPath = "history.sqlite";
    if (!File.Exists(dbPath))
    {
        SQLiteConnection.CreateFile(dbPath);
        using (SQLiteConnection connection = new SQLiteConnection("Data Source=" + dbPath))
        {
            connection.Open();
            string createTableSql = "CREATE TABLE history(id INTEGER PRIMARY KEY AUTOINCREMENT, n INT, m INT, time FLOAT, correctRate FLOAT)";
            SQLiteCommand command = new SQLiteCommand(createTableSql, connection);
            command.ExecuteNonQuery();
        }
    }
    using (SQLiteConnection connection = new SQLiteConnection("Data Source=" + dbPath))
    {
        connection.Open();
        int n = 10;
        int m = 5;
        float time = 10.0f;
        float correctRate = 80.0f;
        string insertSql = "INSERT INTO history(n, m, time, correctRate) VALUES(@n, @m, @time, @correctRate)";
        SQLiteCommand command = new SQLiteCommand(insertSql, connection);
        command.Parameters.AddWithValue("@n", n);
        command.Parameters.AddWithValue("@m", m);
        command.Parameters.AddWithValue("@time", time);
        command.Parameters.AddWithValue("@correctRate", correctRate);
        command.ExecuteNonQuery();
        string querySql1 = "SELECT MAX(correctRate) FROM history WHERE n=@n AND m=@m";
        SQLiteCommand command1 = new SQLiteCommand(querySql1, connection);
        command1.Parameters.AddWithValue("@n", n);
        command1.Parameters.AddWithValue("@m", m);
        object maxCorrectRate1 = command1.ExecuteScalar();
        Console.WriteLine("n=" + n + ", m=" + m + "的最好成绩（根据正确率）：" + maxCorrectRate1);
        string querySql2 = "SELECT * FROM history WHERE n=@n AND m=@m ORDER BY correctRate DESC";
        SQLiteCommand command2 = new SQLiteCommand(querySql2, connection);
        command2.Parameters.AddWithValue("@n", n);
        command2.Parameters.AddWithValue("@m", m);
        SQLiteDataReader reader = command2.ExecuteReader();
        Console.WriteLine("n=" + n + ", m=" + m + "的所有历史成绩：");
        while (reader.Read())
        {
            Console.WriteLine("id=" + reader.GetInt32(0) + ", time=" + reader.GetFloat(3) + ", correctRate=" + reader.GetFloat(4));
        }
    }
}