I have a background worker. Before I invoke the worker I disable a button and make a gif visible. I then invoke the runworkerasync method and it runs fine until comleteion. On the 'RunWorkerCompleted()' I get a cross thread error. Any idea why?
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();
}
It seems to be an issue with VSTO and BackgroundWorker.
The solution is here.
Basically you need to call
System.Threading.SynchronizationContext.SetSynchronizationContext(new WindowsFormsSynchronizationContext());
before you call RunWorkerAsync
. Works great.
To avoid instantiating the object every time you may have a static member in you AddIn's main class and reuse it. This way you only instantiate once.
something about VSTO running the background worker on the same thread as the controls. Not sure. I had to check the 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();
}
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