System.IO.File.Exists and System.IO.Directory.Exists don't behave as expected on UWP

[jasells]

Basically, line #62 in StorageFile.cs
public bool Exists => this.Originator != null && File.Exists(this.Path);
and a similar check in StorageFolder.cs don't work as expected on UWP due to differences in app-based permission scheme in UWP. The .Exists propery appears to always return false, even is the app has permission to the directory.

I have a fork that simply removes the System.IO.File/Directory.Exists call and rely only on the Windows.Storage API to gaurantee that a Windows.Storage.StorageFile/StorageFolder can only be created ( != null) if the file/folder exists. This seems to be the case, and the intent of this API.

This is what I changed it to, and it seems to work in my testing:

public bool Exists => this.Originator != null;

Here's my PR.

Here's the original issue that lead to this.

[jamesmcroft]

@jasells your changes are available in the NuGet packages currently going through validation. The new version number will be 1.3.18257.3.

I will leave this issue open until you're happy that your fix is available and working. Thanks for the PR!

[jasells]

Apologies for not closing this sooner! It is fixed with 1.3.1857.3