I'm fiddling with MonoDroid (aka Mono for Android) trying to build a simple podcast downloading app, currently just testing out retrieval of an RSS feed contents.My simple app is:an edit text where the url for an RSS feed is inputa button to 'download' the rssa text display for the output of the download operationWhen a user clicks on download, I fetch the RSS contents, currently using XDocument (I also tried with just WebRequest / Streams etc.), here's the short version:void button_Click(object sender, EventArgs e){ output.Text += "user input: " + rssUriInput.Text + "\n"; try { output.Text += "### document ###"; output.Text += XDocument.Load(rssUriInput.Text).ToString(); output.Text += "### document ###"; } catch (Exception ex) { output.Text += "OOOPS something went wrong:\n" + ex.ToString(); }}I've tried several approaches, but keep getting ObjectDisposedExceptions when I do XDocument.Load(/*my uri here*/);My AssemblyInfo.cs includes the [assembly: UsesPermission(Android.Manifest.Permission.Internet)]Now, disclaimer, after getting hello world running I kind of went off on my own, so I may be missing some MonoDroid fundamentals, but this code works in a normal C# app (I tested it) but
Why am I doing wrong here? Do I have to do something special to use xml / linq / network access in MonoDroid?here is the full activity code:using System;using Android.App;using Android.Content;using Android.Runtime;using Android.Views;using Android.Widget;using Android.OS;using System.Xml.Linq;namespace RssDownlowd{ [Activity(Label = "RssDownlowd", MainLauncher = true, Icon = "@drawable/icon")] public class Activity1 : Activity { EditText rssUriInput; Button button; TextView output; protected override void OnCreate(Bundle bundle) { base.OnCreate(bundle); SetContentView(Resource.Layout.RssDownload); rssUriInput = FindViewById<EditText>(Resource.Id.rssUriText); button = FindViewById<Button>(Resource.Id.downloadButton); output = FindViewById<TextView>(Resource.Id.outputTextView); button.Click += new EventHandler(button_Click); } void button_Click(object sender, EventArgs e) { output.Text += "user input: " + rssUriInput.Text + "\n"; try { output.Text += "### document ###"; output.Text += XDocument.Load(rssUriInput.Text).ToString(); output.Text += "### document ###"; } catch (Exception ex) { output.Text += "OOOPS something went wrong:\n" + ex.ToString(); } } }}And here is the full exception:"System.ObjectDisposedException: The object was used after being disposed. at System.Net.WebConnection.BeginRead (System.Net.HttpWebRequest request, System.Byte[] buffer, Int32 offset, Int32 size, System.AsyncCallback cb, System.Object state) [0x00000] in <filename unknown>:0 at System.Net.WebConnectionStream.BeginRead (System.Byte[] buffer, Int32 offset, Int32 size, System.AsyncCallback cb, System.Object state) [0x00000] in <filename unknown>:0 at System.Net.WebConnectionStream.Read (System.Byte[] buffer, Int32 offset, Int32 size) [0x00000] in <filename unknown>:0 at System.Xml.XmlInputStream.Read (System.Byte[] buffer, Int32 offset, Int32 count) [0x00000] in <filename unknown>:0 at System.Xml.NonBlockingStreamReader.ReadBuffer () [0x00000] in <filename unknown>:0 at System.Xml.NonBlockingStreamReader.Read (System.Char[] dest_buffer, Int32 index, Int32 count) [0x00000] in <filename unknown>:0 at System.Xml.XmlStreamReader.Read (System.Char[] dest_buffer, Int32 index, Int32 count) [0x00000] in <filename unknown>:0 at Mono.Xml2.XmlTextReader.ReadTextReader (Int32 remained) [0x00000] in <filename unknown>:0 at Mono.Xml2.XmlTextReader.PeekChar () [0x00000] in <filename unknown>:0 at Mono.Xml2.XmlTextReader.ReadChar () [0x00000] in <filename unknown>:0 at Mono.Xml2.XmlTextReader.Expect (Int32 expected) [0x00000] in <filename unknown>:0 at Mono.Xml2.XmlTextReader.ReadEntityReference (Boolean ignoreEntityReferences) [0x00000] in <filename unknown>:0 at Mono.Xml2.XmlTextReader.ReadReference (Boolean ignoreEntityReferences) [0x00000] in <filename unknown>:0 at Mono.Xml2.XmlTextReader.ReadText (Boolean notWhitespace) [0x00000] in <filename unknown>:0 at Mono.Xml2.XmlTextReader.ReadContent () [0x00000] in <filename unknown>:0 at Mono.Xml2.XmlTextReader.Read () [0x00000] in <filename unknown>:0 at System.Xml.XmlTextReader.Read () [0x00000] in <filename unknown>:0 at Mono.Xml.XmlFilterReader.Read () [0x00000] in <filename unknown>:0 at System.Xml.Linq.XElement.LoadCore (System.Xml.XmlReader r, LoadOptions options) [0x00000] in <filename unknown>:0 at System.Xml.Linq.XNode.ReadFrom (System.Xml.XmlReader r, LoadOptions options) [0x00000] in <filename unknown>:0 at System.Xml.Linq.XContainer.ReadContentFrom (System.Xml.XmlReader reader, LoadOptions options) [0x00000] in <filename unknown>:0 at System.Xml.Linq.XElement.LoadCore (System.Xml.XmlReader r, LoadOptions options) [0x00000] in <filename unknown>:0 at System.Xml.Linq.XNode.ReadFrom (System.Xml.XmlReader r, LoadOptions options) [0x00000] in <filename unknown>:0 at System.Xml.Linq.XContainer.ReadContentFrom (System.Xml.XmlReader reader, LoadOptions options) [0x00000] in <filename unknown>:0 at System.Xml.Linq.XElement.LoadCore (System.Xml.XmlReader r, LoadOptions options) [0x00000] in <filename unknown>:0 at System.Xml.Linq.XNode.ReadFrom (System.Xml.XmlReader r, LoadOptions options) [0x00000] in <filename unknown>:0 at System.Xml.Linq.XContainer.ReadContentFrom (System.Xml.XmlReader reader, LoadOptions options) [0x00000] in <filename unknown>:0 at System.Xml.Linq.XElement.LoadCore (System.Xml.XmlReader r, LoadOptions options) [0x00000] in <filename unknown>:0 at System.Xml.Linq.XNode.ReadFrom (System.Xml.XmlReader r, LoadOptions options) [0x00000] in <filename unknown>:0 at System.Xml.Linq.XContainer.ReadContentFrom (System.Xml.XmlReader reader, LoadOptions options) [0x00000] in <filename unknown>:0 at System.Xml.Linq.XDocument.ReadContent (System.Xml.XmlReader reader, LoadOptions options) [0x00000] in <filename unknown>:0 at System.Xml.Linq.XDocument.LoadCore (System.Xml.XmlReader reader, LoadOptions options) [0x00000] in <filename unknown>:0 at System.Xml.Linq.XDocument.Load (System.String uri, LoadOptions options) [0x00000] in <filename unknown>:0 at System.Xml.Linq.XDocument.Load (System.String uri) [0x00000] in <filename unknown>:0 at RssDownlowd.Activity1.button_Click (System.Object sender, System.EventArgs e) [0x0004a] in C:\\Users\\khd483\\code\\HelloMonoDroid\\RssDownlowd\\Activity1.cs:47 "
Why am I doing wrong here? Do I have to do something special to use xml / linq / network access in MonoDroid?here is the full activity code:using System;using Android.App;using Android.Content;using Android.Runtime;using Android.Views;using Android.Widget;using Android.OS;using System.Xml.Linq;namespace RssDownlowd{ [Activity(Label = "RssDownlowd", MainLauncher = true, Icon = "@drawable/icon")] public class Activity1 : Activity { EditText rssUriInput; Button button; TextView output; protected override void OnCreate(Bundle bundle) { base.OnCreate(bundle); SetContentView(Resource.Layout.RssDownload); rssUriInput = FindViewById<EditText>(Resource.Id.rssUriText); button = FindViewById<Button>(Resource.Id.downloadButton); output = FindViewById<TextView>(Resource.Id.outputTextView); button.Click += new EventHandler(button_Click); } void button_Click(object sender, EventArgs e) { output.Text += "user input: " + rssUriInput.Text + "\n"; try { output.Text += "### document ###"; output.Text += XDocument.Load(rssUriInput.Text).ToString(); output.Text += "### document ###"; } catch (Exception ex) { output.Text += "OOOPS something went wrong:\n" + ex.ToString(); } } }}And here is the full exception:"System.ObjectDisposedException: The object was used after being disposed. at System.Net.WebConnection.BeginRead (System.Net.HttpWebRequest request, System.Byte[] buffer, Int32 offset, Int32 size, System.AsyncCallback cb, System.Object state) [0x00000] in <filename unknown>:0 at System.Net.WebConnectionStream.BeginRead (System.Byte[] buffer, Int32 offset, Int32 size, System.AsyncCallback cb, System.Object state) [0x00000] in <filename unknown>:0 at System.Net.WebConnectionStream.Read (System.Byte[] buffer, Int32 offset, Int32 size) [0x00000] in <filename unknown>:0 at System.Xml.XmlInputStream.Read (System.Byte[] buffer, Int32 offset, Int32 count) [0x00000] in <filename unknown>:0 at System.Xml.NonBlockingStreamReader.ReadBuffer () [0x00000] in <filename unknown>:0 at System.Xml.NonBlockingStreamReader.Read (System.Char[] dest_buffer, Int32 index, Int32 count) [0x00000] in <filename unknown>:0 at System.Xml.XmlStreamReader.Read (System.Char[] dest_buffer, Int32 index, Int32 count) [0x00000] in <filename unknown>:0 at Mono.Xml2.XmlTextReader.ReadTextReader (Int32 remained) [0x00000] in <filename unknown>:0 at Mono.Xml2.XmlTextReader.PeekChar () [0x00000] in <filename unknown>:0 at Mono.Xml2.XmlTextReader.ReadChar () [0x00000] in <filename unknown>:0 at Mono.Xml2.XmlTextReader.Expect (Int32 expected) [0x00000] in <filename unknown>:0 at Mono.Xml2.XmlTextReader.ReadEntityReference (Boolean ignoreEntityReferences) [0x00000] in <filename unknown>:0 at Mono.Xml2.XmlTextReader.ReadReference (Boolean ignoreEntityReferences) [0x00000] in <filename unknown>:0 at Mono.Xml2.XmlTextReader.ReadText (Boolean notWhitespace) [0x00000] in <filename unknown>:0 at Mono.Xml2.XmlTextReader.ReadContent () [0x00000] in <filename unknown>:0 at Mono.Xml2.XmlTextReader.Read () [0x00000] in <filename unknown>:0 at System.Xml.XmlTextReader.Read () [0x00000] in <filename unknown>:0 at Mono.Xml.XmlFilterReader.Read () [0x00000] in <filename unknown>:0 at System.Xml.Linq.XElement.LoadCore (System.Xml.XmlReader r, LoadOptions options) [0x00000] in <filename unknown>:0 at System.Xml.Linq.XNode.ReadFrom (System.Xml.XmlReader r, LoadOptions options) [0x00000] in <filename unknown>:0 at System.Xml.Linq.XContainer.ReadContentFrom (System.Xml.XmlReader reader, LoadOptions options) [0x00000] in <filename unknown>:0 at System.Xml.Linq.XElement.LoadCore (System.Xml.XmlReader r, LoadOptions options) [0x00000] in <filename unknown>:0 at System.Xml.Linq.XNode.ReadFrom (System.Xml.XmlReader r, LoadOptions options) [0x00000] in <filename unknown>:0 at System.Xml.Linq.XContainer.ReadContentFrom (System.Xml.XmlReader reader, LoadOptions options) [0x00000] in <filename unknown>:0 at System.Xml.Linq.XElement.LoadCore (System.Xml.XmlReader r, LoadOptions options) [0x00000] in <filename unknown>:0 at System.Xml.Linq.XNode.ReadFrom (System.Xml.XmlReader r, LoadOptions options) [0x00000] in <filename unknown>:0 at System.Xml.Linq.XContainer.ReadContentFrom (System.Xml.XmlReader reader, LoadOptions options) [0x00000] in <filename unknown>:0 at System.Xml.Linq.XElement.LoadCore (System.Xml.XmlReader r, LoadOptions options) [0x00000] in <filename unknown>:0 at System.Xml.Linq.XNode.ReadFrom (System.Xml.XmlReader r, LoadOptions options) [0x00000] in <filename unknown>:0 at System.Xml.Linq.XContainer.ReadContentFrom (System.Xml.XmlReader reader, LoadOptions options) [0x00000] in <filename unknown>:0 at System.Xml.Linq.XDocument.ReadContent (System.Xml.XmlReader reader, LoadOptions options) [0x00000] in <filename unknown>:0 at System.Xml.Linq.XDocument.LoadCore (System.Xml.XmlReader reader, LoadOptions options) [0x00000] in <filename unknown>:0 at System.Xml.Linq.XDocument.Load (System.String uri, LoadOptions options) [0x00000] in <filename unknown>:0 at System.Xml.Linq.XDocument.Load (System.String uri) [0x00000] in <filename unknown>:0 at RssDownlowd.Activity1.button_Click (System.Object sender, System.EventArgs e) [0x0004a] in C:\\Users\\khd483\\code\\HelloMonoDroid\\RssDownlowd\\Activity1.cs:47 "