BackgroundWorker 不在 VSTO 中工作

Question

我有一个后台工作人员。在调用工人之前，我禁用了一个按钮并使 gif 可见。然后我调用 runworkerasync 方法，它运行良好，直到完成。在“RunWorkerCompleted()”上，我得到一个跨线程错误。知道为什么吗？

    private void buttonRun_Click(object sender, EventArgs e)
    {
        if (comboBoxFiscalYear.SelectedIndex != -1 && !string.IsNullOrEmpty(textBoxFolderLoc.Text))
        {
            try
            {
                u = new UpdateDispositionReports(
                    Convert.ToInt32(comboBoxFiscalYear.SelectedItem.ToString())
                    , textBoxFolderLoc.Text
                    , Properties.Settings.Default.TemplatePath
                    , Properties.Settings.Default.ConnStr);
                this.buttonRun.Enabled = false;
                this.pictureBox1.Visible = true;

                BackgroundWorker bw = new BackgroundWorker();
                bw.DoWork += new DoWorkEventHandler(bw_DoWork);
                bw.RunWorkerCompleted += new RunWorkerCompletedEventHandler(bw_RunWorkerCompleted);
                bw.RunWorkerAsync();
                //backgroundWorker1.RunWorkerAsync();
            }
            catch (Exception ex)
            {
                MessageBox.Show("Unable to process.\nError:" + ex.Message, Properties.Settings.Default.AppName);
            }
        }
    }

    void bw_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
    {
        buttonRun.Enabled = true;
        pictureBox1.Visible = false;
    }

    void bw_DoWork(object sender, DoWorkEventArgs e)
    {
        u.Execute();
    }

Answer 1

这似乎是 VSTO 和 BackgroundWorker 的问题。

解决方案是here。

基本上你需要调用

System.Threading.SynchronizationContext.SetSynchronizationContext(new WindowsFormsSynchronizationContext());

在您致电RunWorkerAsync 之前。效果很好。

为了避免每次您在 AddIn 的主类中有一个静态成员并重用它时都实例化该对象。这样您只需实例化一次。

Answer 2

关于在与控件相同的线程上运行后台工作程序的 VSTO。没有把握。我必须检查InvokeRequired

    private void buttonRun_Click(object sender, EventArgs e)
    {
        if (comboBoxFiscalYear.SelectedIndex != -1 && !string.IsNullOrEmpty(textBoxFolderLoc.Text))
        {
            try
            {
                u = new UpdateDispositionReports(
                    Convert.ToInt32(comboBoxFiscalYear.SelectedItem.ToString())
                    , textBoxFolderLoc.Text
                    , Properties.Settings.Default.TemplatePath
                    , Properties.Settings.Default.ConnStr);
                this.buttonRun.Enabled = false;
                this.pictureBox1.Visible = true;

                BackgroundWorker bw = new BackgroundWorker();
                bw.DoWork += new DoWorkEventHandler(bw_DoWork);
                bw.RunWorkerCompleted += new RunWorkerCompletedEventHandler(bw_RunWorkerCompleted);
                bw.RunWorkerAsync();
                //backgroundWorker1.RunWorkerAsync();
            }
            catch (Exception ex)
            {
                MessageBox.Show("Unable to process.\nError:" + ex.Message, Properties.Settings.Default.AppName);
            }
        }
    }
    delegate void ReenableRunCallback();

    private void ReenableRun()
    {
        if (this.buttonRun.InvokeRequired)
        {
            ReenableRunCallback r = new ReenableRunCallback(ReenableRun);
            this.buttonRun.Invoke(r, null);
        }
        else
            this.buttonRun.Enabled = true;
    }
    private void HideProgress()
    {
        if (this.pictureBox1.InvokeRequired)
        {
            ReenableRunCallback r = new ReenableRunCallback(HideProgress);
            this.pictureBox1.Invoke(r, null);
        }
        else
            this.pictureBox1.Visible = false;
    }

    void bw_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
    {
        ReenableRun();
        HideProgress();
    }

    void bw_DoWork(object sender, DoWorkEventArgs e)
    {
        u.Execute();
    }