[Mono-bugs] [Bug 45123][Maj] New - System.Array.BinarySearch does not work properly for objects without an IComparer Interface

bugzilla-daemon@rocky.ximian.com bugzilla-daemon@rocky.ximian.com
Thu, 19 Jun 2003 09:22:23 -0400 (EDT)

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Changed by barce@frlp.utn.edu.ar.


--- shadow/45123	Thu Jun 19 09:22:23 2003
+++ shadow/45123.tmp.19699	Thu Jun 19 09:22:23 2003
@@ -0,0 +1,87 @@
+Bug#: 45123
+Product: Mono/Class Libraries
+Version: unspecified
+OS Details: linux
+Status: NEW   
+Priority: Major
+Component: CORLIB
+AssignedTo: mono-bugs@ximian.com                            
+ReportedBy: barce@frlp.utn.edu.ar               
+QAContact: mono-bugs@ximian.com
+TargetMilestone: ---
+Summary: System.Array.BinarySearch does not work properly for objects without an IComparer Interface
+Please fill in this template when reporting a bug, unless you know what you
+are doing.
+Description of Problem:
+ArrayList.BinarySearch does not work properly (like MS .NET Framework) when
+looking for a Socket object.
+Steps to reproduce the problem:
+1. This code works with MS .NET Framework (Windows)
+using System;
+namespace ConsoleApplication2
+	class Class1
+	{
+		/// <summary>
+		/// Punto de entrada principal de la aplicación.
+		/// </summary>
+		[STAThread]
+		static void Main(string[] args)
+		{
+			System.Net.Sockets.Socket socket1 = 
+				new
+				System.Net.Sockets.SocketType.Raw, System.Net.Sockets.ProtocolType.Icmp);
+			System.Collections.ArrayList list = new System.Collections.ArrayList(5);
+			list.Add(socket1);
+			Console.WriteLine("{0}",list.BinarySearch(socket1));
+		}
+	}
+Actual Results:
+[root@gnu tmp]# mono --debug Class1.exe
+Unhandled Exception: System.ArgumentException: comparer is null and value
+does not support IComparable
+in [0x00091] (at
+/mnt/disco3/home/barce/monocvs/mcs/class/corlib/System/Array.cs:410) 00
+in [0x0000b] (at
+00 System.Collections.ArrayList:BinarySearch
+in [0x0000a] (at
+00 System.Collections.ArrayList:BinarySearch (object)
+in [0x0001f] (at /tmp/Class1.cs:23) 00 ConsoleApplication2.Class1:Main
+Expected Results:
+How often does this happen? 
+Additional Information:
+It seems that Mono System.Array.BinarySearch Does not like to search for an
+object without an IComparable interface. This seems correct but the MS .NET
+Framework and ROTOR do it. I looked at the ROTOR sources and instead of
+thorowing an Exception as Mono does in this case it searchs anyway using an
+external function (TrySZBinarySearch)