c# - devexpress 进度条 performstep 方法未显示

Question

我需要在上传时将记录从 excel 表上传到 sql server 我需要在 devexpress 进度条中显示进度，并且也需要以上传 100 中的 1 的方式显示进度，并且它应该递增直到完成

Answer 1

创建一个BackgroundWorker并将进度报告回主 GUI 线程。然后使用来自 BackgroundWorker 的状态更新进度条值。

这是一个例子，它使用了一个常见的 WinForms ProgressBar 而不是 DevExpress ProgressBar，但原理是一样的。

public partial class Progress : Form
{
    readonly BackgroundWorker _worker = new BackgroundWorker();

    public Progress()
    {
        InitializeComponent();

        _worker.WorkerReportsProgress = true;
        _worker.DoWork += _worker_DoWork;
        _worker.ProgressChanged += WorkerProgressChanged;
        _worker.RunWorkerCompleted += WorkerRunWorkerCompleted;

        _worker.RunWorkerAsync();
    }


    private void _worker_DoWork(object sender, DoWorkEventArgs e)
    {
        var worker = sender as BackgroundWorker;

        // Simulate work (uploading Excel records to SQL Server)
        for (var i = 1; i <= 100; i++)
        {
            if (worker.CancellationPending)
            {
                e.Cancel = true;
                break;
            }

            // Upload some data here, Sleep(100) is just an example
            Thread.Sleep(100);

            // Calculate current progress and report
            worker.ReportProgress(i);
        }
    }

    void WorkerProgressChanged(object sender, ProgressChangedEventArgs e)
    {
        _progressBar.Value = e.ProgressPercentage;
    }

    void WorkerRunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
    {
        _progressBar.Value = 0;
    }
}