这是一个模拟示例

Here is a mock up example

private async void button1_Click(object sender, EventArgs e)
{

    progressBar1.Value = 0;

    var progress = new Progress<int>(percent =>
    {
        progressBar1.PerformStep();
        if (percent == progressBar1.Maximum)
        {
            MessageBox.Show("Finished");
        }
    });

    await Task.Run(() => Processing(progress));

}