[IronPython] The Overloading Story, IsolatedStorage (Silverlight)

Dino Viehland dinov at microsoft.com
Mon Apr 6 17:17:08 CEST 2009

For the read case what happens if you explicitly pass FileShare.None instead of FileShare.Read?  The reason I ask is the default for FileShare is FileShare.None unless FileAccess == FileAccess.Read.

We should just be picking the ctor w/o parameters here so my guess is that the default values are actually behaving in a surprising way.  But then again IsolatedStorage is a bit of a magical API (at least on the desktop CLR) so there is a possibility that something weird is happening here.

From: users-bounces at lists.ironpython.com [mailto:users-bounces at lists.ironpython.com] On Behalf Of David Seruyange
Sent: Sunday, April 05, 2009 6:50 AM
To: Discussion of IronPython
Subject: [IronPython] The Overloading Story, IsolatedStorage (Silverlight)

Hey everyone,

What is the story on overloading with IronPython? From Michael Foord's IronPython in Action p. 208:

"[Overloading] largely works seemlessly in IronPython... If IronPython gets it wrong, it's a bug and you should report it on the IronPython mailing list or the issue tracker on the IronPython CodePlex site!"

I've been recently implementing some Silverlight + IronPython and ran into trouble with IsolatedStorage. Specifically, there are overloads for the OpenFile method as follows:

OpenFile(string path, FileMode mode)
OpenFile(string path, FileMode mode, FileAccess access)
OpenFile(string path, FileMode mode, FileAccess access, FileShare share)

In order to open the file for reading, I found that the two parameter version was inadequate:
ioStorage = IsolatedStorageFile.GetUserStoreForApplication()
ioStorage.OpenFile("foo.text", FileMode.Open) # FAIL

But passing all parameters led to success:
ioStorage.OpenFile("foo.text", FileMode.Open, FileAccess.Read, FileShare.Read) #WIN

Interestingly enough, I can succeed in writing to a file when I don't pass a FileShare parameter:
ioStorage.OpenFile("foo.text", FileMode.Append, FileAccess.Write)

I would assume there would be some issue with incompatibility with the defaults for the parameter assignment but when I use a C# project I can succeed with the stripped down calls to create a filestream in IsolatedStorage.

Anticipating enlightenment,


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