[Mono-bugs] [Bug 76191][Nor] Changed - Wrong and invalid DirectoryInfo.Parent values on Windows

[bugzilla-daemon at bugzilla.ximian.com]

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Changed by kornelpal at hotmail.com.

http://bugzilla.ximian.com/show_bug.cgi?id=76191

--- shadow/76191	2005-09-27 16:00:10.000000000 -0400
+++ shadow/76191.tmp.19646	2005-09-27 21:02:36.000000000 -0400
@@ -11,13 +11,13 @@
 AssignedTo: mono-bugs at ximian.com                            
 ReportedBy: kornelpal at hotmail.com               
 QAContact: mono-bugs at ximian.com
 TargetMilestone: ---
 URL: 
 Cc: 
-Summary: OpenFileDialog.ShowDialog() leak
+Summary: Wrong and invalid DirectoryInfo.Parent values on Windows
 
 Code to reproduce bug:
 class OpenFileDialogBug
 {
 	static void Main()
 	{
@@ -72,6 +72,67 @@
 Where is this code running?  
 
 I tried running it on /tmp and it terminates fine.
 
 ------- Additional Comments From peter at novonyx.com  2005-09-27 15:52 -------
 You ran on a Windows machine? Note the OS: Windows XP
+
+------- Additional Comments From kornelpal at hotmail.com  2005-09-27 21:02 -------
+The above described infinite loop is caused by the unexpected 
+behaviour that DirectoryInfo.Parent returns the root path for the 
+root path instead of null. In addition it returns C:\\ that is an 
+accepted but non-canonicalized form of C:\.
+
+Code:
+using System;
+using System.IO;
+
+class DirectoryInfoParentBug 
+{
+	static void Main() 
+	{
+		DirectoryInfo parent;
+
+		Directory.SetCurrentDirectory
+(@"C:\WINDOWS\system32");
+
+		parent = new DirectoryInfo(@"C:").Parent;
+		Console.WriteLine(parent == null ? "<null>" : 
+parent.FullName);
+
+		parent = new DirectoryInfo(@"C:\").Parent;
+		Console.WriteLine(parent == null ? "<null>" : 
+parent.FullName);
+
+		parent = new DirectoryInfo(@"C:\dir").Parent;
+		Console.WriteLine(parent == null ? "<null>" : 
+parent.FullName);
+
+		parent = new DirectoryInfo(@"C:\dir\").Parent;
+		Console.WriteLine(parent == null ? "<null>" : 
+parent.FullName);
+
+		parent = new DirectoryInfo(@"C:\dir\dir").Parent;
+		Console.WriteLine(parent == null ? "<null>" : 
+parent.FullName);
+	
+		parent = new DirectoryInfo(@"C:\dir\dir\").Parent;
+		Console.WriteLine(parent == null ? "<null>" : 
+parent.FullName);
+	}
+}
+
+Current results:
+<null>
+C:\\
+C:\\
+C:\dir
+C:\dir
+C:\dir\dir
+
+Expected results:
+C:\WINDOWS
+<null>
+C:\
+C:\
+C:\dir
+C:\dir