DirectoryInfo.MoveTo mistakenly prevents renaming directories to case variations of themselves on Windows, macOS

[mklement0]

Description

Note: The original bug report, #30479, covered both DirectoryInfo.MoveTo() and Directory.Move(), but the PR that was meant to fix the problem fixed Directory.Move() only.

See the linked report for conceptual background information.

Reproduction Steps

You can paste following snippet directly into a dotnet-script REPL and press Enter.

using System.IO;

Environment.CurrentDirectory = Path.GetTempPath();

var di = Directory.CreateDirectory("foo");

// This should succeed even on macOS and Windows, but throws an exception.
di.MoveTo("FOO");

Expected behavior

Renaming should succeed, on all supported platforms.

Actual behavior

On Windows and macOS, the following exception is thrown:

System.IO.IOException: Source and destination path must be different.

Regression?

No response

Known Workarounds

Use the static Directory.Move() method instead.

Configuration

.NET 6.0.0-rtm.21522.10

Other information

No response

[ghost]

Tagging subscribers to this area: @dotnet/area-system-io
See info in area-owners.md if you want to be subscribed.

Issue Details

---

Description

Note: The original bug report, #30479, covered both DirectoryInfo.MoveTo() and Directory.Move(), but the PR that was meant to fix the problem fixed Directory.Move() only.

See the linked report for conceptual background information.

Reproduction Steps

You can paste following snippet directly into a dotnet-script REPL and press Enter.

using System.IO;

Environment.CurrentDirectory = Path.GetTempPath();

var di = Directory.CreateDirectory("foo");

// This should succeed even on macOS and Windows, but throws an exception.
di.MoveTo("FOO");

Expected behavior

Renaming should succeed, on all supported platforms.

Actual behavior

On Windows and macOS, the following exception is thrown:

System.IO.IOException: Source and destination path must be different.

Regression?

No response

Known Workarounds

Use the static Directory.Move() method instead.

Configuration

.NET 6.0.0-rtm.21522.10

Other information

No response

Author:	mklement0
Assignees:	-
Labels:	area-System.IO, untriaged
Milestone:	-