[Mono-list] Patch for System.Diagnostics.Trace

[Jonathan Pryor]

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Attached are patches to provide the System.Diagnostics.Trace, 
System.Diagnostics.Debug, and related classes.

I'm aware that some of these classes are already present, but the
attached versions have some improvements:

 - Debug.cs: Clean up (lots of code can be shared with Trace.cs, which 
   is why TraceImpl.cs is introduced), "DEBUG" conditional support.

 - TraceListener.cs: Proper implementation of Dispose pattern; 
   implementation of non-abstract methods in terms of abstract methods.

 - TraceListenerCollection.cs: check `object' types before adding

 - TextWriterTraceListener.cs: properly implement Dispose pattern;
   handle NeedIndent and WriteIndent

 - Trace.cs: new file; provides Trace functionality, "TRACE" conditional
   support

 - TraceImpl.cs: new file; actual implementation of Debug & Trace 
   classes; thread support

 - DefaultTraceListener.cs: new file; the default trace listener

Thanks,
 - Jon

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Content-Disposition: attachment; filename=DefaultTraceListener.cs
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//
// System.Diagnostics.DefaultTraceListener.cs
//
// Authors:
//   Jonathan Pryor (jonpryor@vt.edu)
//
// (C) 2002 Jonathan Pryor
//

using System;
using System.IO;
using System.Runtime.InteropServices;

using System.Diagnostics;

namespace System.Diagnostics {

	// This needs help, as MSDN specifies that GUI widgets be used.
	// The short-term solution is to just send output to OutputDebugString.
	[ComVisible(false)]
	public class DefaultTraceListener : TraceListener {

		public DefaultTraceListener () : base ("Default")
		{
		}

		[MonoTODO]
		public bool AssertUiEnabled {
			get {return false;}
			set {/* ignore */}
		}

		[MonoTODO]
		public string LogFileName {
			get {return "";}
			set {/* ignore */}
		}


		#if USE_NATIVE_OUTPUT_DEBUG_STRING

		[DllImport ("kernel32.dll")]
		private extern static void OutputDebugString (string message);

		#else

		private static void OutputDebugString (string message)
		{
			Console.Write ("**ods** " + message);
		}

		#endif

		public override void Write (string message)
		{
			if (NeedIndent)
				WriteIndent ();
			OutputDebugString (message);
		}

		public override void WriteLine (string message)
		{
			if (NeedIndent)
				WriteIndent ();
			OutputDebugString (message + Environment.NewLine);
			NeedIndent =3D true;
		}
	}
}


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//
// System.Diagnostics.TextWriterTraceListener.cs
//
// Authors:
//   Jonathan Pryor (jonpryor@vt.edu)
//
// (C) 2002 Jonathan Pryor
//

using System;
using System.IO;
using System.Diagnostics;

namespace System.Diagnostics {

	public class TextWriterTraceListener : TraceListener {

		private TextWriter writer;

		public TextWriterTraceListener () : base ("TextWriter") {
		}

		public TextWriterTraceListener (Stream stream)
			: this (stream, "")
		{
		}

		public TextWriterTraceListener (string fileName)
			: this (fileName, "")
		{
		}

		public TextWriterTraceListener (TextWriter writer)
			: this (writer, "")
		{
		}

		public TextWriterTraceListener (Stream stream, string name)=20
			: base (name !=3D null ? name : "")
		{
			if (stream =3D=3D null)=20
				throw new ArgumentNullException ("stream");
			writer =3D new StreamWriter (stream);
		}

		public TextWriterTraceListener (string fileName, string name)=20
			: base (name !=3D null ? name : "")
		{
			if (fileName =3D=3D null)
				throw new ArgumentNullException ("fileName");
			writer =3D new StreamWriter (File.OpenWrite (fileName));
		}

		public TextWriterTraceListener (TextWriter writer, string name)=20
			: base (name !=3D null ? name : "")
		{
			if (writer =3D=3D null)
				throw new ArgumentNullException ("writer");
			this.writer =3D writer;
		}

		public TextWriter Writer {
			get {return writer;}
			set {writer =3D value;}
		}

		public override void Close ()
		{
			if (writer !=3D null) {
				writer.Flush ();
				writer.Close ();
				writer =3D null;
			}
		}

		protected override void Dispose (bool disposing)
		{
			if (disposing)
				Close ();
		}

		public override void Flush ()
		{
			writer.Flush ();
		}

		public override void Write (string message)
		{
			if (NeedIndent)
				WriteIndent ();
			writer.Write (message);
		}

		public override void WriteLine (string message)
		{
			if (NeedIndent)
				WriteIndent ();
			writer.WriteLine (message);
			NeedIndent =3D true;
		}
	}
}


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Content-Disposition: attachment; filename=Trace.cs
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//
// System.Diagnostics.Trace.cs
//
// Authors:
//   Jonathan Pryor (jonpryor@vt.edu)
//
// (C) 2002 Jonathan Pryor
//

using System;
using System.Diagnostics;

namespace System.Diagnostics {

	public sealed class Trace {

		public static bool AutoFlush {
			get {return TraceImpl.AutoFlush;}
			set {TraceImpl.AutoFlush =3D value;}
		}

		public static int IndentLevel {
			get {return TraceImpl.IndentLevel;}
			set {TraceImpl.IndentLevel =3D value;}
		}

		public static int IndentSize {
			get {return TraceImpl.IndentSize;}
			set {TraceImpl.IndentSize =3D value;}
		}

		public static TraceListenerCollection Listeners {
			get {return TraceImpl.Listeners;}
		}

		[Conditional("TRACE")]
		public static void Assert (bool condition)
		{
			TraceImpl.Assert (condition);
		}

		[Conditional("TRACE")]
		public static void Assert (bool condition, string message)
		{
			TraceImpl.Assert (condition, message);
		}

		[Conditional("TRACE")]
		public static void Assert (bool condition, string message,=20
			string detailMessage)
		{
			TraceImpl.Assert (condition, message, detailMessage);
		}

		[Conditional("TRACE")]
		public static void Close ()
		{
			TraceImpl.Close ();
		}

		[Conditional("TRACE")]
		public static void Fail (string message)
		{
			TraceImpl.Fail (message);
		}

		[Conditional("TRACE")]
		public static void Fail (string message, string detailMessage)
		{
			TraceImpl.Fail (message, detailMessage);
		}

		[Conditional("TRACE")]
		public static void Flush ()
		{
			TraceImpl.Flush ();
		}

		[Conditional("TRACE")]
		public static void Indent ()
		{
			TraceImpl.Indent ();
		}

		[Conditional("TRACE")]
		public static void Unindent ()
		{
			TraceImpl.Unindent ();
		}

		[Conditional("TRACE")]
		public static void Write (object value)
		{
			TraceImpl.Write (value);
		}

		[Conditional("TRACE")]
		public static void Write (string message)
		{
			TraceImpl.Write (message);
		}

		[Conditional("TRACE")]
		public static void Write (object value, string category)
		{
			TraceImpl.Write (value, category);
		}

		[Conditional("TRACE")]
		public static void Write (string message, string category)
		{
			TraceImpl.Write (message, category);
		}

		[Conditional("TRACE")]
		public static void WriteIf (bool condition, object value)
		{
			TraceImpl.WriteIf (condition, value);
		}

		[Conditional("TRACE")]
		public static void WriteIf (bool condition, string message)
		{
			TraceImpl.WriteIf (condition, message);
		}

		[Conditional("TRACE")]
		public static void WriteIf (bool condition, object value,=20
			string category)
		{
			TraceImpl.WriteIf (condition, value, category);
		}

		[Conditional("TRACE")]
		public static void WriteIf (bool condition, string message,=20
			string category)
		{
			TraceImpl.WriteIf (condition, message, category);
		}

		[Conditional("TRACE")]
		public static void WriteLine (object value)
		{
			TraceImpl.WriteLine (value);
		}

		[Conditional("TRACE")]
		public static void WriteLine (string message)
		{
			TraceImpl.WriteLine (message);
		}

		[Conditional("TRACE")]
		public static void WriteLine (object value, string category)
		{
			TraceImpl.WriteLine (value, category);
		}

		[Conditional("TRACE")]
		public static void WriteLine (string message, string category)
		{
			TraceImpl.WriteLine (message, category);
		}

		[Conditional("TRACE")]
		public static void WriteLineIf (bool condition, object value)
		{
			TraceImpl.WriteLineIf (condition, value);
		}

		[Conditional("TRACE")]
		public static void WriteLineIf (bool condition, string message)
		{
			TraceImpl.WriteLineIf (condition, message);
		}

		[Conditional("TRACE")]
		public static void WriteLineIf (bool condition, object value,=20
			string category)
		{
			TraceImpl.WriteLineIf (condition, value, category);
		}

		[Conditional("TRACE")]
		public static void WriteLineIf (bool condition, string message,=20
			string category)
		{
			TraceImpl.WriteLineIf (condition, message, category);
		}
	}
}


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Content-Disposition: attachment; filename=TraceImpl.cs
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//
// System.Diagnostics.TraceImpl.cs
//
// Authors:
//   Jonathan Pryor (jonpryor@vt.edu)
//
// (C) 2002 Jonathan Pryor
//


using System;
using System.Diagnostics;

namespace System.Diagnostics {

	internal class TraceImpl {

		private static object lock_ =3D new object ();

		private static bool autoFlush =3D false;

		public static bool AutoFlush {
			get {return autoFlush;}
			set {autoFlush =3D value;}
		}

		// From MSDN: "This property is stored on=20
		// per-thread/pre-reqeust basis"
		//
		// What exactly does this mean?  Sure, we can mark it
		// [ThreadStatic], which make a per-thread value, but what
		// does this mean for each of the writers?  Do *they* need to
		// store this as a thread-static value?
		[MonoTODO, ThreadStatic]
		private static int indentLevel =3D 0;

		public static int IndentLevel {
			get {return indentLevel;}
			set {indentLevel =3D value;}
		}

		// From MSDN: "This property is stored on=20
		// per-thread/pre-reqeust basis"
		//
		// What exactly does this mean?  Sure, we can mark it
		// [ThreadStatic], which make a per-thread value, but what
		// does this mean for each of the writers?  Do *they* need to
		// store this as a thread-static value?
		[MonoTODO, ThreadStatic]
		private static int indentSize =3D 4;

		public static int IndentSize {
			get {return indentSize;}
			set {indentSize =3D value;}
		}

		private static TraceListenerCollection listeners =3D=20
			new TraceListenerCollection ();

		public static TraceListenerCollection Listeners {
			get {return listeners;}
		}

		// According to MSDN, this method should display a dialog box
		[MonoTODO]
		public static void Assert (bool condition)
		{
			if (!condition)
				Fail (new StackTrace().ToString());
		}

		// According to MSDN, this method should display a dialog box
		[MonoTODO]
		public static void Assert (bool condition, string message)
		{
			if (!condition)
				Fail (message);
		}

		// According to MSDN, this method should display a dialog box
		[MonoTODO]
		public static void Assert (bool condition, string message,=20
			string detailMessage)
		{
			if (!condition)
				Fail (message, detailMessage);
		}

		public static void Close ()
		{
			lock (lock_) {
				foreach (TraceListener listener in Listeners) {
					listener.Close ();
				}
			}
		}

		// From testing .NET, this method should display a dialog
		[MonoTODO]
		public static void Fail (string message)
		{
			lock (lock_) {
				foreach (TraceListener listener in Listeners) {
					listener.Fail (message);
				}
			}
		}

		// From testing .NET, this method should display a dialog
		[MonoTODO]
		public static void Fail (string message, string detailMessage)
		{
			lock (lock_) {
				foreach (TraceListener listener in Listeners) {
					listener.Fail (message, detailMessage);
				}
			}
		}

		public static void Flush ()
		{
			lock (lock_) {
				foreach (TraceListener listener in Listeners){
					listener.Flush ();
				}
			}
		}

		public static void Indent ()
		{
			lock (lock_) {
				foreach (TraceListener listener in Listeners) {
					listener.IndentLevel++;
				}
			}
		}

		public static void Unindent ()
		{
			lock (lock_) {
				foreach (TraceListener listener in Listeners) {
					listener.IndentLevel--;
				}
			}
		}

		public static void Write (object value)
		{
			lock (lock_) {
				foreach (TraceListener listener in Listeners) {
					listener.Write (value);

					if (AutoFlush)
						listener.Flush ();
				}
			}
		}

		public static void Write (string message)
		{
			lock (lock_) {
				foreach (TraceListener listener in Listeners) {
					listener.Write (message);

					if (AutoFlush)
						listener.Flush ();
				}
			}
		}

		public static void Write (object value, string category)
		{
			lock (lock_) {
				foreach (TraceListener listener in Listeners) {
					listener.Write (value, category);

					if (AutoFlush)
						listener.Flush ();
				}
			}
		}

		public static void Write (string message, string category)
		{
			lock (lock_) {
				foreach (TraceListener listener in Listeners) {
					listener.Write (message, category);

					if (AutoFlush)
						listener.Flush ();
				}
			}
		}

		public static void WriteIf (bool condition, object value)
		{
			if (condition)
				Write (value);
		}

		public static void WriteIf (bool condition, string message)
		{
			if (condition)
				Write (message);
		}

		public static void WriteIf (bool condition, object value,=20
			string category)
		{
			if (condition)
				Write (value, category);
		}

		public static void WriteIf (bool condition, string message,=20
			string category)
		{
			if (condition)
				Write (message, category);
		}

		public static void WriteLine (object value)
		{
			lock (lock_) {
				foreach (TraceListener listener in Listeners) {
					listener.WriteLine (value);

					if (AutoFlush)
						listener.Flush ();
				}
			}
		}

		public static void WriteLine (string message)
		{
			lock (lock_) {
				foreach (TraceListener listener in Listeners) {
					listener.WriteLine (message);

					if (AutoFlush)
						listener.Flush ();
				}
			}
		}

		public static void WriteLine (object value, string category)
		{
			lock (lock_) {
				foreach (TraceListener listener in Listeners) {
					listener.WriteLine (value, category);

					if (AutoFlush)
						listener.Flush ();
				}
			}
		}

		public static void WriteLine (string message, string category)
		{
			lock (lock_) {
				foreach (TraceListener listener in Listeners) {
					listener.WriteLine (message, category);

					if (AutoFlush)
						listener.Flush ();
				}
			}
		}

		public static void WriteLineIf (bool condition, object value)
		{
			if (condition)
				WriteLine (value);
		}

		public static void WriteLineIf (bool condition, string message)
		{
			if (condition)
				WriteLine (message);
		}

		public static void WriteLineIf (bool condition, object value,=20
			string category)
		{
			if (condition)
				WriteLine (value, category);
		}

		public static void WriteLineIf (bool condition, string message,=20
			string category)
		{
			if (condition)
				WriteLine (message, category);
		}
	}
}


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//
// System.Diagnostics.Debug.cs
//
// Authors:
//   Jonathan Pryor (jonpryor@vt.edu)
//
// (C) 2002 Jonathan Pryor
//

using System;
using System.Diagnostics;

namespace System.Diagnostics {

	public sealed class Debug {

		public static bool AutoFlush {
			get {return TraceImpl.AutoFlush;}
			set {TraceImpl.AutoFlush =3D value;}
		}

		public static int IndentLevel {
			get {return TraceImpl.IndentLevel;}
			set {TraceImpl.IndentLevel =3D value;}
		}

		public static int IndentSize {
			get {return TraceImpl.IndentSize;}
			set {TraceImpl.IndentSize =3D value;}
		}

		public static TraceListenerCollection Listeners {
			get {return TraceImpl.Listeners;}
		}

		[Conditional("DEBUG")]
		public static void Assert (bool condition)
		{
			TraceImpl.Assert (condition);
		}

		[Conditional("DEBUG")]
		public static void Assert (bool condition, string message)
		{
			TraceImpl.Assert (condition, message);
		}

		[Conditional("DEBUG")]
		public static void Assert (bool condition, string message,=20
			string detailMessage)
		{
			TraceImpl.Assert (condition, message, detailMessage);
		}

		[Conditional("DEBUG")]
		public static void Close ()
		{
			TraceImpl.Close ();
		}

		[Conditional("DEBUG")]
		public static void Fail (string message)
		{
			TraceImpl.Fail (message);
		}

		[Conditional("DEBUG")]
		public static void Fail (string message, string detailMessage)
		{
			TraceImpl.Fail (message, detailMessage);
		}

		[Conditional("DEBUG")]
		public static void Flush ()
		{
			TraceImpl.Flush ();
		}

		[Conditional("DEBUG")]
		public static void Indent ()
		{
			TraceImpl.Indent ();
		}

		[Conditional("DEBUG")]
		public static void Unindent ()
		{
			TraceImpl.Unindent ();
		}

		[Conditional("DEBUG")]
		public static void Write (object value)
		{
			TraceImpl.Write (value);
		}

		[Conditional("DEBUG")]
		public static void Write (string message)
		{
			TraceImpl.Write (message);
		}

		[Conditional("DEBUG")]
		public static void Write (object value, string category)
		{
			TraceImpl.Write (value, category);
		}

		[Conditional("DEBUG")]
		public static void Write (string message, string category)
		{
			TraceImpl.Write (message, category);
		}

		[Conditional("DEBUG")]
		public static void WriteIf (bool condition, object value)
		{
			TraceImpl.WriteIf (condition, value);
		}

		[Conditional("DEBUG")]
		public static void WriteIf (bool condition, string message)
		{
			TraceImpl.WriteIf (condition, message);
		}

		[Conditional("DEBUG")]
		public static void WriteIf (bool condition, object value,=20
			string category)
		{
			TraceImpl.WriteIf (condition, value, category);
		}

		[Conditional("DEBUG")]
		public static void WriteIf (bool condition, string message,=20
			string category)
		{
			TraceImpl.WriteIf (condition, message, category);
		}

		[Conditional("DEBUG")]
		public static void WriteLine (object value)
		{
			TraceImpl.WriteLine (value);
		}

		[Conditional("DEBUG")]
		public static void WriteLine (string message)
		{
			TraceImpl.WriteLine (message);
		}

		[Conditional("DEBUG")]
		public static void WriteLine (object value, string category)
		{
			TraceImpl.WriteLine (value, category);
		}

		[Conditional("DEBUG")]
		public static void WriteLine (string message, string category)
		{
			TraceImpl.WriteLine (message, category);
		}

		[Conditional("DEBUG")]
		public static void WriteLineIf (bool condition, object value)
		{
			TraceImpl.WriteLineIf (condition, value);
		}

		[Conditional("DEBUG")]
		public static void WriteLineIf (bool condition, string message)
		{
			TraceImpl.WriteLineIf (condition, message);
		}

		[Conditional("DEBUG")]
		public static void WriteLineIf (bool condition, object value,=20
			string category)
		{
			TraceImpl.WriteLineIf (condition, value, category);
		}

		[Conditional("DEBUG")]
		public static void WriteLineIf (bool condition, string message,=20
			string category)
		{
			TraceImpl.WriteLineIf (condition, message, category);
		}
	}
}


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Content-Disposition: attachment; filename=TraceListener.cs
Content-Transfer-Encoding: quoted-printable
Content-Type: text/plain; charset=UTF-8

//
// System.Diagnostics.TraceListener.cs
//
// Authors:
//   Jonathan Pryor (jonpryor@vt.edu)
//
// (C) 2002 Jonathan Pryor
//

using System;
using System.Diagnostics;

namespace System.Diagnostics {

	public abstract class TraceListener : MarshalByRefObject, IDisposable {

		private int indentLevel =3D 0;
		private int indentSize =3D 4;
		private string name =3D null;
		private bool needIndent =3D false;

		protected TraceListener () : this ("")
		{
		}

		protected TraceListener (string name)
		{
			Name =3D name;
		}

		public int IndentLevel {
			get {return indentLevel;}
			set {indentLevel =3D value;}
		}

		public int IndentSize {
			get {return indentSize;}
			set {indentSize =3D value;}
		}

		public virtual string Name {
			get {return name;}
			set {name =3D value;}
		}

		protected bool NeedIndent {
			get {return needIndent;}
			set {needIndent =3D value;}
		}

		public virtual void Close ()
		{
		}

		public void Dispose ()
		{
			Dispose (true);
			GC.SuppressFinalize (this);
		}

		protected virtual void Dispose (bool disposing)
		{
		}

		public virtual void Fail (string message)
		{
			Fail (message, "");
		}

		public virtual void Fail (string message, string detailMessage)
		{
			WriteLine ("---- DEBUG ASSERTION FAILED ----");
			WriteLine ("---- Assert Short Message ----");
			WriteLine (message);
			WriteLine ("---- Assert Long Message ----");
			WriteLine (detailMessage);
			WriteLine ("");
		}

		public virtual void Flush ()
		{
		}

		public virtual void Write (object o)
		{
			Write (o.ToString());
		}

		public abstract void Write (string message);

		public virtual void Write (object o, string category)
		{
			Write (o.ToString(), category);
		}

		public virtual void Write (string message, string category)
		{
			Write (category + ": " + message);
		}

		protected virtual void WriteIndent ()
		{
			String indent =3D new String (' ', IndentLevel*IndentSize);
			Write (indent);
			NeedIndent =3D false;
		}

		public virtual void WriteLine (object o)
		{
			WriteLine (o.ToString());
		}

		public abstract void WriteLine (string message);

		public virtual void WriteLine (object o, string category)
		{
			WriteLine (o.ToString(), category);
		}

		public virtual void WriteLine (string message, string category)
		{
			WriteLine (category + ": " + message);
		}
	}
}


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Content-Disposition: attachment; filename=TraceListenerCollection.cs
Content-Transfer-Encoding: quoted-printable
Content-Type: text/plain; charset=UTF-8

//
// System.Diagnostics.TraceListenerCollection.cs
//
// Authors:
//   Jonathan Pryor (jonpryor@vt.edu)
//
// (C) 2002 Jonathan Pryor
//


using System;
using System.Collections;
using System.Diagnostics;
using System.Globalization;

namespace System.Diagnostics {

	public class TraceListenerCollection : IList, ICollection, IEnumerable {

		private ArrayList listeners =3D new ArrayList ();

		public TraceListenerCollection ()
		{
			Add (new DefaultTraceListener ());
		}

		public int Count{
			get {return listeners.Count;}
		}

		public TraceListener this [string name] {
			get {
				foreach (TraceListener listener in listeners) {
					if (listener.Name =3D=3D name)
						return listener;
				}
				return null;
			}
		}

		public object this [int index] {
			get {return listeners[index];}
			set {listeners[index] =3D value;}
		}

		bool ICollection.IsSynchronized {
			get {return listeners.IsSynchronized;}
		}

		object ICollection.SyncRoot {
			get {return listeners.SyncRoot;}
		}

		bool IList.IsFixedSize {
			get {return listeners.IsFixedSize;}
		}

		bool IList.IsReadOnly {
			get {return listeners.IsReadOnly;}
		}

		public int Add (TraceListener listener)
		{
			return listeners.Add (listener);
		}

		public void AddRange (TraceListener[] value)
		{
			listeners.AddRange (value);
		}

		public void AddRange (TraceListenerCollection value)
		{
			listeners.AddRange (value.listeners);
		}

		public void Clear ()
		{
			listeners.Clear ();
		}

		public bool Contains (TraceListener listener)
		{
			return listeners.Contains (listener);
		}

		public void CopyTo (TraceListener[] listeners, int index)
		{
			listeners.CopyTo (listeners, index);
		}

		public IEnumerator GetEnumerator ()
		{
			return listeners.GetEnumerator ();
		}

		void ICollection.CopyTo (Array array, int index)
		{
			listeners.CopyTo (array, index);
		}

		int IList.Add (object value)
		{
			if (value is TraceListener)
				return listeners.Add (value);
			throw new NotSupportedException (Locale.GetText (
				"You can only add TraceListener objects to the collection"));
		}

		bool IList.Contains (object value)
		{
			if (value is TraceListener)
				return listeners.Contains (value);
			return false;
		}

		int IList.IndexOf (object value)
		{
			if (value is TraceListener)
				return listeners.IndexOf (value);
			return -1;
		}

		void IList.Insert (int index, object value)
		{
			if (value is TraceListener) {
				listeners.Insert (index, value);
				return;
			}
			throw new NotSupportedException (Locale.GetText (
				"You can only insert TraceListener objects into the collection"));
		}

		void IList.Remove (object value)
		{
			if (value is TraceListener)
				listeners.Remove (value);
		}

		public int IndexOf (TraceListener listener)
		{
			return listeners.IndexOf (listener);
		}

		public void Insert (int index, TraceListener listener)
		{
			listeners.Insert (index, listener);
		}

		public void Remove (string name)
		{
			TraceListener found =3D null;

			foreach (TraceListener listener in listeners) {
				if (listener.Name =3D=3D name) {
					found =3D listener;
					break;
				}
			}

			if (found !=3D null)
				listeners.Remove (found);
			else
				throw new ArgumentException (Locale.GetText (
					"TraceListener " + name + " was not in the collection"));
		}

		public void Remove (TraceListener listener)
		{
			listeners.Remove (listener);
		}

		public void RemoveAt (int index)
		{
			listeners.RemoveAt (index);
		}
	}
}


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