単一のプロセスを実行するバックグラウンド ワーカーがあります。途中で処理をキャンセルできるようにしたいのですが、CancelAsync() メソッドを呼び出すと、実際にはキャンセルされません。どこが間違っていますか？
DoWork() メソッドは次のとおりです。
private void bgw_DoWork(object sender, DoWorkEventArgs e)
{
BackgroundWorker b = sender as BackgroundWorker;
if (b != null)
{
if (!b.CancellationPending)
{
try
{
// Let's run the process as a backgroundworker so we have the ability to cancel the search, and/or be able to view results while it's still searching
ProcessParameters pp = e.Argument as ProcessParameters;
if (pp.DoReplace)
results = FindReplace.FindReplace.FindAndReplace(pp.PathToSearch, pp.FindText, pp.ReplaceText, pp.UseRegularExpressions, pp.IncludeList, pp.ExcludeList, pp.RecurseSubdirectories, pp.IgnoreCase);
else
results = FindReplace.FindReplace.Find(pp.PathToSearch, pp.FindText, pp.UseRegularExpressions, pp.IncludeList, pp.ExcludeList, pp.RecurseSubdirectories, pp.IgnoreCase);
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
}
}
else
{
// Cancel was clicked
e.Cancel = true;
}
}
}
処理を開始するメソッドは次のとおりです。
private void btnGo_Click(object sender, EventArgs e)
{
if (btnGo.Text == "Cancel")
{
if (DialogResult.Yes == MessageBox.Show("Are you sure you wish to cancel?", "Cancel Requested", MessageBoxButtons.YesNo, MessageBoxIcon.Question))
bgw.CancelAsync();
return;
}
if (tbFind.Text.Length == 0)
{
MessageBox.Show("Find text is not valid.");
return;
}
tbFound.Text = String.Empty;
tbFoundInThisFile.Text = String.Empty;
lvResults.Items.Clear();
includeList = null;
excludeList = null;
results = null;
if (radDirectory.Checked && !radFile.Checked)
{
includeList = BuildIncludeExcludeList(tbIncludeFiles.Text);
excludeList = BuildIncludeExcludeList(tbExcludeFiles.Text);
}
ProcessParameters pp = null;
if (chkReplace.Checked)
pp = new ProcessParameters(tbPath.Text, tbFind.Text, tbReplace.Text, chkUseRegEx.Checked, includeList, excludeList, chkRecursion.Checked, chkIgnoreCase.Checked, true);
else
pp = new ProcessParameters(tbPath.Text, tbFind.Text, chkUseRegEx.Checked, includeList, excludeList, chkRecursion.Checked, chkIgnoreCase.Checked, false);
bgw.RunWorkerAsync(pp);
// Toggle fields to locked while it's running
btnGo.Text = "Cancel";
}
WorkerCompleted() イベントは次のとおりです。
private void bgw_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
btnGo.Text = "Go";
string message = String.Empty;
const string caption = "FindAndReplace is Complete";
if (!e.Cancelled)
{
if (results != null)
{
tbFound.Text = results.Found.ToString();
tbSearched.Text = results.FilesSearched.ToString();
tbSkipped.Text = results.FilesSkipped.ToString();
message = String.Format("Search finished resulting in {0} match(es).", results.Found);
}
else
message = "The FindAndReplace results were empty. The process was cancelled or there was an error during operation.";
}
else
message = "The FindAndReplace process was cancelled.";
if (e.Error != null)
message += String.Format("{0}{0}There was an error during processing: {1}", Environment.NewLine, e.Error);
MessageBox.Show(message, caption);
}