Question

我点击datagridview按钮时尝试将数据重新加载到refresh，但点击后数据未刷新。使用MySQL数据库，当我启动程序时，我进入数据库管理器SQLYog并手动在该行中进行更改。之后，我切换到我的应用程序，然后按下刷新按钮以执行应用程序工作但没有任何事情发生。我不知道我做错了什么，网格中的数据没有刷新......

这是我的代码：

class MainWindow : Form
{
    private MySqlDataAdapter adapter;
    private MySqlCommandBuilder cmd;
    private BindingSource bs = new BindingSource();
    private DataGridView dataGridView1;
    private DataTable dt = new DataTable();

    // Constructor
    public MainWindow()
    {
        this.InitializeComponent();
    }
    // Get data
    public void GetData(string sql)
    {        
        using (var conn = new MySqlConnection(Properties.Settings.Default.connString))
        {
            try
            {
                conn.Open();
                adapter = new MySqlDataAdapter(sql, conn);
                cmd = new MySqlCommandBuilder(adapter);
                adapter.Fill(dt);
                bs.DataSource = dt;                           
            }
            catch (MySqlException ex)
            {
                MessageBox.Show(ex.Message);
            }
        }           
    }

    // Load
    private void MainWindow_Load(object sender, EventArgs e)
    {
        dataGridView1.DataSource = bs;
        GetData("SELECT * FROM grupe_artikala");
    }

   // Reload click
    private void reload_Click(object sender, EventArgs e)
    {
        GetData(adapter.SelectCommand.CommandText);
    }
}

Answer 1

试试这个：

    class MainWindow : Form
    {
    private MySqlDataAdapter adapter;
    private MySqlCommandBuilder cmd;
    private BindingSource bs = new BindingSource();
    private DataGridView dataGridView1;
    private DataTable dt = new DataTable();
    String sql = "SELECT * FROM grupe_artikala";

    // Constructor
    public MainWindow()
    {
        this.InitializeComponent();
    }
    // Get data
    public void GetData(string sql)
    {        
        using (var conn = new MySqlConnection(Properties.Settings.Default.connString))
        {
            try
            {
                conn.Open();
                adapter = new MySqlDataAdapter(sql, conn);
                cmd = new MySqlCommandBuilder(adapter);
                adapter.Fill(dt);
                bs.DataSource = dt;                           
            }
            catch (MySqlException ex)
            {
                MessageBox.Show(ex.Message);
            }
        }           
    }

    // Load
    private void MainWindow_Load(object sender, EventArgs e)
    {
        dataGridView1.DataSource = bs;
        GetData(sql);
    }

   // Reload click
    private void reload_Click(object sender, EventArgs e)
    {
        dataGridView1.DataSource = null;
        dataGridView1.DataSource = bs;
        GetData(sql);
        datagridview1.update();
        datagridview1.refresh();
    }
}

Answer 2

你应该写这个。这可能会解决您的问题

class MainWindow : Form
{
    private MySqlDataAdapter adapter;
    private MySqlCommandBuilder cmd;
    private BindingSource bs = new BindingSource();
    private DataGridView dataGridView1;
    private DataTable dt = new DataTable();

    // Constructor
    public MainWindow()
    {
        this.InitializeComponent();
    }
    // Get data
    public void GetData(string sql)
    {        
        using (var conn = new MySqlConnection(Properties.Settings.Default.connString))
        {
            try
            {
                conn.Open();
                adapter = new MySqlDataAdapter(sql, conn);
                cmd = new MySqlCommandBuilder(adapter);
                adapter.Fill(dt);
                bs.DataSource = dt;                           
            }
            catch (MySqlException ex)
            {
                MessageBox.Show(ex.Message);
            }
        }           
    }

    // Load
    private void MainWindow_Load(object sender, EventArgs e)
    {
        dataGridView1.DataSource = bs;
        String sql = "SELECT * FROM grupe_artikala";
    }

   // Reload click
    private void reload_Click(object sender, EventArgs e)
    {
        GetData(sql);
    }
}

C＃data to datagridview不会重新加载

2 个答案: