C# 使用backgroundworker问题需要帮助来解决此问题

当我按下btn_Connect时，backgroundworker将启动，但当它到达时，在我单击messagebox上的ok后提示messagebox，它将再次运行并显示messagebox，当我再次单击btn_Connect时，它将执行相同的操作，并且它将递增，因此第一次单击是第二次单击btn_Connect时显示messagebox的两倍三次。如何解决这个问题,

这是我的密码：

private void testConnection()
    {
        backgroundWorker.ReportProgress(15);

        txt.createConnectionFile(txtServerName.Text, txtDatabase.Text, txtUserName.Text, txtPassword.Text);

        backgroundWorker.ReportProgress(30);

        cn.createConnection();

        backgroundWorker.ReportProgress(60);

        try
        {
            backgroundWorker.ReportProgress(80);

            cn.openConnection();

            MessageBox.Show("Connected!", "Connection Success", MessageBoxButtons.OK, MessageBoxIcon.Information);
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message, "Connection Error", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
        }

        backgroundWorker.ReportProgress(100);
    }

    private void backgroundWorker_ProgressChanged(object sender, ProgressChangedEventArgs e)
    {
        progressBar.Value = e.ProgressPercentage;
    }

    private void backgroundWorker_DoWork(object sender, DoWorkEventArgs e)
    {
        testConnection();
    }
private void btnConnect_Click(object sender, EventArgs e)
    {
        progressBar.Visible = true;
        backgroundWorker.WorkerReportsProgress = true;
        backgroundWorker.WorkerSupportsCancellation = true;
        backgroundWorker.ProgressChanged += backgroundWorker_ProgressChanged;
        backgroundWorker.DoWork += backgroundWorker_DoWork;

        backgroundWorker.RunWorkerAsync();
    }

---

我注意到的一点是，每次单击按钮时，您都会连接DoWork和RunWorkerCompleted事件

根据上面的代码，我怀疑第一次单击按钮时它会运行一次，然后按钮会再次启用。下次单击按钮时，它将运行两次，下次运行三次，以此类推

您需要在单击按钮之外连接事件。例如，在OnLoad中

如果无法执行此操作，请将单击代码替换为

private void btnConnect_Click(object sender, EventArgs e)
    {
        progressBar.Visible = true;
        backgroundWorker.WorkerReportsProgress = true;
        backgroundWorker.WorkerSupportsCancellation = true;
        backgroundWorker.ProgressChanged -= backgroundWorker_ProgressChanged;
        backgroundWorker.ProgressChanged += backgroundWorker_ProgressChanged;

        backgroundWorker.DoWork -= backgroundWorker_DoWork;
        backgroundWorker.DoWork += backgroundWorker_DoWork;

        backgroundWorker.RunWorkerAsync();
    }