如何在DataGridView中使用ProgressBar控件

Question

I want to use a ProgressBar control in C# when my DataGridView is loading data, but when I run my program I get an error:

Cross-thread operation not valid: Control 'dataGridView1' accessed from a thread other than the thread it was created on.

Code:

private readonly BackgroundWorker _bw = new BackgroundWorker();

public workerbloks()
{
    InitializeComponent();

    progressBar1.MarqueeAnimationSpeed = 30;

    // set Visible false before you start long running task
    progressBar1.Visible = false;
    _bw.DoWork += show_worked_bloks;
    _bw.RunWorkerCompleted += BW_RunWorkerCompleted;
}

private void button1_Click(object sender, EventArgs e)
{
    progressBar1.Show();
    _bw.RunWorkerAsync();
}

private void BW_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
    progressBar1.Hide();
}

public void show_worked_bloks(object sender, DoWorkEventArgs doWorkEventArgs)
{
    MYDBMS md = new MYDBMS();
    DataTable dt = new DataTable();
    clsWorkBloks clswb = new clsWorkBloks();

    try
    {
        dt = md.ExecuteSelectSQL(clswb.show_all_worked_bloks());
        dataGridView1.DataSource = dt;
    }
    catch
    {
    }
}

Answer 1

Execute the specified delegate asynchronously on the thread that the dataGridView1 underlying handle was created on.

dataGridView1.BeginInvoke((MethodInvoker)delegate
{
    this.dataGridView1.DataSource = dt;
});

As the progressbar is just marquee display. Simply bring it to front before running background worker.

progressBar1.BringToFront();
progressBar1.Show();
_bw.RunWorkerAsync();