/// <summary>
/// This is an event handler called when the user clicks the Export button.
/// </summary>
private void FileSaveButton_Click(object sender, EventArgs e)
{
// If no export method is selected, bail.
if (cbExportMethod.SelectedItem == null)
{
MessageBox.Show("No export method selected. Please select an export method.", "Error", MessageBoxButtons.OK, MessageBoxIcon.Warning);
return;
}
// Gather the selected results
WatcherResultCollection selectedResults = new WatcherResultCollection();
foreach (AlertListViewItem item in alertListView.Items)
{
WatcherResult result = new WatcherResult();
result.Description = item.Description;
result.Severity = item.Severity;
result.Title = item.TypeX;
result.URL = item.URL;
selectedResults.Add(result);
}
// The export method refers to an instance of the output plugin
WatcherOutputPlugin outputPlugin = cbExportMethod.SelectedItem as WatcherOutputPlugin;
if (outputPlugin == null)
{
Trace.TraceError("WatcherResultsControl: Invalid export method selected.");
MessageBox.Show("Unable to use the selected export method.", "Error", MessageBoxButtons.OK, MessageBoxIcon.Warning);
return;
}
String filename = String.Empty;
String filter = String.Empty;
// If this plugin is a file-based export, open a file save dialog and allow
// the user to select the output filename. Use the default values provided
// by the plugin.
//
// TODO: Plugin should be interface-based or provide a property to tell whether it is a file-based export or not
if (outputPlugin.GetExportDefaults(ref filename, ref filter))
{
SaveFileDialog dlg = new SaveFileDialog();
dlg.FileName = filename;
dlg.Filter = filter;
dlg.InitialDirectory = Environment.GetFolderPath(Environment.SpecialFolder.Desktop);
dlg.FilterIndex = 1;
dlg.RestoreDirectory = true;
// Display the dialog, and if canceled, abort.
if (dlg.ShowDialog() != DialogResult.OK)
{
Trace.TraceInformation("User canceled export.");
return;
}
// Update the filename selected by the user
filename = dlg.FileName;
}
// This is the export progress dialog shown during the export process
// CHANGE - potentially breaking change, removing progress dialog
// which seems to be dreadfully slowing down real work.
WatcherEngine.ProgressDialog.Show();
WatcherEngine.ProgressDialog.Title = "Export Data";
// Perform the export asynchronously
ExportResultsCallback callback = new ExportResultsCallback(ExportResults);
callback.BeginInvoke(outputPlugin, selectedResults, filename,
// This is the anonymous callback method
delegate(IAsyncResult ar)
{
try
{
// Tidy up after the export
ExportResultsCallback _callback = (ExportResultsCallback)ar.AsyncState;
_callback.EndInvoke(ar); // NOTE: This will throw any unhandled exceptions that happened during the call
}
catch (WatcherException ex)
{
Trace.TraceError("Exception: {0}", ex.Message);
if (ex.Data.Contains("UserAbortedOperation") == false)
{
// Only show a message box if the user hasn't already seen one (i.e., they've elected to abort the operation)
MessageBox.Show(this, String.Format("{0}", ex.Message), "Error", MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
return;
}
finally
{
// CHANGE - see above breaking change, removing progress dialog.
WatcherEngine.ProgressDialog.Hide();
}
MessageBox.Show(this, "Items successfully exported.", "Success", MessageBoxButtons.OK, MessageBoxIcon.Information);
},
// Pass the callback as user data so we can call EndInvoke() when the operation completes
// to retrieve the result.
callback);
}