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POInvalidOperationException using PFX w/ Windows Forms
 

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    <p>I have two exceptions here. Not sure why they occur because I use Form.Invoke to run UI updates on the UI thread. So first,</p> <pre><code>using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Xml; using System.Windows.Forms; namespace Toplr { using System.Collections.Specialized; using System.Xml.XPath; using System.Xml.Linq; using System.Text; using System.ServiceModel.Web; using System.ServiceModel.Syndication; using System.Net; using System.Web; using System.Xml.Schema; using System.IO; using System.Threading; using System.Threading.Tasks; public partial class ToplrForm : Form { private readonly Uri SearchBase = new Uri(@"http://www.twine.com/feed/atom/entries/"); private readonly UriTemplate SearchTemplate = new UriTemplate(@"search?type={type}&amp;author={author}"); public ToplrForm() { InitializeComponent(); Exiting = false; TaskContext = new TaskManager(); Items = new AsyncBindingList&lt;Twine&gt;(this); twineBindingSource.DataSource = Items; } private void ToplrForm_Load(object sender, EventArgs e) { } private readonly TaskManager TaskContext; private readonly AsyncBindingList&lt;Twine&gt; Items; private bool Exiting; private void exitToolStripMenuItem_Click(object sender, EventArgs e) { MessageBox.Show("Close()"); Close(); } private void ToplrForm_FormClosing(object sender, FormClosingEventArgs e) { MessageBox.Show("Exiting = tru"); Exiting = true; //TaskContext.Dispose(); } private void saveToolStripMenuItem_Click(object sender, EventArgs e) { var sfd = new SaveFileDialog() { ValidateNames = true }; if (sfd.ShowDialog() == DialogResult.OK) { using (var xtw = new XmlTextWriter(sfd.FileName, Encoding.UTF8)) { var xw = XmlWriter.Create(xtw); xw.WriteStartDocument(); xw.WriteStartElement("opml"); xw.WriteAttributeString("version", "1.1"); xw.WriteStartElement("head"); xw.WriteElementString("title", userNameComboBox.Text); xw.WriteEndElement(); xw.WriteStartElement("body"); foreach (var row in twineDataGridView.SelectedRows) { var twine = (Twine)((DataGridViewRow)row).DataBoundItem; if (twine != null) { xw.WriteStartElement("outline"); xw.WriteAttributeString("text", twine.Title); xw.WriteAttributeString("type", "link"); xw.WriteAttributeString("url", twine.HtmlAddress); xw.WriteStartElement("outline"); xw.WriteAttributeString("text", twine.Title); xw.WriteAttributeString("type", "atom"); xw.WriteAttributeString("url", twine.AtomAddress); xw.WriteEndElement(); xw.WriteEndElement(); } } xw.WriteEndElement(); xw.WriteEndElement(); xw.WriteEndDocument(); xw.Close(); } } } private void aboutToolStripMenuItem_Click(object sender, EventArgs e) { MessageBox.Show("Copyright (C) 2009 Bent Rasmussen"); } private void accessButton_Click(object sender, EventArgs e) { var user = userNameComboBox.Text; Task.Create(x =&gt; ProcessAccount(user)); } public void ProcessAccount(string user) { this.Invoke((Action)(() =&gt; { userNameComboBox.Enabled = false; accessButton.Enabled = false; toolStripStatusLabel1.Text = "Processing..."; })); var param = new NameValueCollection(); param.Add("type", "Twine"); param.Add("author", user); var source = SearchTemplate.BindByName(SearchBase, param); var wc = new WebClient(); using (var feedStream = wc.OpenRead(source)) { var reader = XmlReader.Create(feedStream); var feed = SyndicationFeed.Load(reader); int c = 0, i = 0; foreach (var item in feed.Items) { this.Invoke((Action)(() =&gt; { toolStripProgressBar1.Increment(1); toolStripStatusLabel1.Text = "Processing..."; })); if (item.Links.Count != 0) { //try { ProcessTwine(item); i++; } //catch (Exception) { c++; } } if (Exiting) break; } } this.Invoke((Action)(() =&gt; { userNameComboBox.Enabled = true; accessButton.Enabled = true; })); } private Twine ProcessTwine(SyndicationItem item) { var result = new Twine(); result.Title = item.Title.Text; result.HtmlAddress = item.Links[0].Uri.ToString(); result.AtomAddress = ""; var wc = new WebClient(); var data = wc.DownloadData(result.HtmlAddress); var stream = new MemoryStream(data); var readerSettings = new XmlReaderSettings() { ProhibitDtd = false, ValidationType = ValidationType.None, ValidationFlags = XmlSchemaValidationFlags.None, }; var reader = XmlReader.Create(stream, readerSettings); var doc = XDocument.Load(reader); var htmlNs = (XNamespace)"http://www.w3.org/1999/xhtml"; var root = doc.Root; var atom = from r in root.Descendants(htmlNs + "head").Descendants(htmlNs + "link") where r.Attribute("rel").Value == "alternate" &amp;&amp; r.Attribute("type").Value == "application/atom+xml" select r.Attribute("href"); foreach (var e in atom) { if (e.Value != "") { result.AtomAddress = e.Value; this.BeginInvoke((Action)(() =&gt; { Items.Add(result); toolStripProgressBar1.Increment(1); })); } break; } return result; } } } </code></pre> <p>This triggers the exception "Cannot access a disposed object" on this fragment</p> <pre><code> this.Invoke((Action)(() =&gt; { toolStripProgressBar1.Increment(1); toolStripStatusLabel1.Text = "Processing..."; })); </code></pre> <p>If this fragment is commented out, I run into the next problem - a <strong>TargetInvocationException</strong> on Program level.</p> <p>The inner exception of this is an <strong>InvalidOperationException</strong>.</p> <p>The code is quite simple, so it should not be hard to implement this, I just new a few hints to move on.</p> <p><a href="http://dl.getdropbox.com/u/797094/Toplr.zip" rel="nofollow noreferrer">Visual Studio project files</a>.</p>
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