[Mono-bugs] [Bug 50366][Wis] New - Delegate Bug - unregistering

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Changed by jasoncwarner@yahoo.com.

http://bugzilla.ximian.com/show_bug.cgi?id=50366

--- shadow/50366	2003-10-30 15:36:29.000000000 -0500
+++ shadow/50366.tmp.8306	2003-10-30 15:36:29.000000000 -0500
@@ -0,0 +1,145 @@
+Bug#: 50366
+Product: Mono/Runtime
+Version: unspecified
+OS: Red Hat 9.0
+OS Details: 
+Status: NEW   
+Resolution: 
+Severity: 
+Priority: Wishlist
+Component: misc
+AssignedTo: mono-bugs@ximian.com                            
+ReportedBy: jasoncwarner@yahoo.com               
+QAContact: mono-bugs@ximian.com
+TargetMilestone: ---
+URL: 
+Cc: 
+Summary: Delegate Bug - unregistering
+
+Simple Delegate Example:
+
+using System;
+
+namespace PhoneCallAttempt
+{
+	class Mother
+	{
+
+		public void Subscribe()
+		{
+			Daughter.OnPhoneCall += new
+Daughter.OnPhoneCallHandler(RecieveNotification);
+			Console.WriteLine("Mother has subscribed to call notification");
+		}
+
+		public void UnSubscribe()
+		{
+			Daughter.OnPhoneCall -= new
+Daughter.OnPhoneCallHandler(RecieveNotification);
+			Console.WriteLine("Mother has UNsubscribed to call notification");
+		}
+
+		public void RecieveNotification(object sender, EventArgs e)
+		{
+			Console.WriteLine("Mother has been notified of call placed");
+		}
+
+	}
+
+	class Father
+	{
+		public void Subscribe()
+		{
+			Daughter.OnPhoneCall += new
+Daughter.OnPhoneCallHandler(RecieveNotification);
+			Console.WriteLine("Father has subscribed to call notification");
+		}
+
+		public void UnSubscribe()
+		{
+			Daughter.OnPhoneCall -= new
+Daughter.OnPhoneCallHandler(RecieveNotification);
+			Console.WriteLine("Father has UNsubscribed to call notification");
+		}
+
+		public void RecieveNotification(object sender, EventArgs e)
+		{
+			Console.WriteLine("Father has been notified of call placed");
+		}
+
+	}
+
+	class Daughter
+	{
+
+		public delegate void OnPhoneCallHandler (object sender, EventArgs e);
+		public static event OnPhoneCallHandler OnPhoneCall;
+		public void PlaceCall()
+		{
+			Console.WriteLine("Daughter has placed a phone call");
+			if (OnPhoneCall != null)
+			{
+				EventArgs e = new EventArgs();
+				OnPhoneCall(this , e);
+			}
+		}
+
+	}
+
+	class Test
+	{
+
+		public static void Main()
+		{
+			Mother m = new Mother();
+			Father f = new Father();
+			Daughter d = new Daughter();
+
+			m.Subscribe();
+			f.Subscribe();
+			d.PlaceCall();
+
+			m.UnSubscribe();
+			f.UnSubscribe();
+			d.PlaceCall();
+
+		}
+	}
+}
+
+Steps to reproduce the problem:
+1. Copy code to file (filename.cs)
+2. compile (mcs filename.cs)
+3. Run (mint filename.exe)
+
+Actual Results:
+
+Mother has subscribed to call notification
+Father has subscribed to call notification
+Daughter has placed a phone call
+Mother has been notified of call placed
+Father has been notified of call placed
+Mother has UNsubscribed to call notification
+Father has UNsubscribed to call notification
+Daughter has placed a phone call
+Mother has been notified of call placed
+Father has been notified of call placed
+
+
+Expected Results:
+
+Mother has subscribed to call notification
+Father has subscribed to call notification
+Daughter has placed a phone call
+Mother has been notified of call placed
+Father has been notified of call placed
+Mother has UNsubscribed to call notification
+Father has UNsubscribed to call notification
+Daughter has placed a phone call
+
+How often does this happen? 
+Every time I run it. 
+
+Additional Information:
+
+Tested on windows with .NET and the code works.