DeleteDirectory frequently throws "The directory is not empty" exception on medium sized directory trees

[BuddhaBuddy1]

What You Are Seeing?

Frequent exception trying to delete a directory with 72 subdirectories with a couple subdirectories each (NuGet cache)

DeleteDirectory(nuGetCacheFolder, new DeleteDirectorySettings {Recursive = true, Force = true});

There are originally 72 folders, each with four layers deep, with the last layer having up to three folders (eg. \destructurama.jsonnet\1.2.1\lib[net452|netcoreapp1.1|netstandard2.0). When I look in the folder after a failure, most of the subdirectories have been deleted, but one or more are left, and they can be different ones. If I just run the script again, it works.

In order to make my builds more dependable, I ended up putting it in a try/catch and doing it again in the catch:

try
{
    DeleteDirectory(nuGetCacheFolder, new DeleteDirectorySettings {Recursive = true, Force = true});
}
catch (Exception)
{
    // It sometimes fails to delete everything, give it one more try
    DeleteDirectory(nuGetCacheFolder, new DeleteDirectorySettings {Recursive = true, Force = true});
}

What is Expected?

Successful deletion of directory tree

What version of Cake are you using?

0.32.1

Are you running on a 32 or 64 bit system?

64

What environment are you running on? Windows? Linux? Mac?

Windows 10 Pro

Are you running on a CI Server? If so, which one?

Yes, but no problem there since they are to a clean workspace every build

How Did You Get This To Happen? (Steps to Reproduce)

Clean task attempts to delete local NuGet cache

Output Log

Error: 
One or more errors occurred.
    The directory is not empty.

[BuddhaBuddy1]

This could be a problem with Visual Studio, as it only happens if Visual Studio is open. I think it is trying to track directories as they are created and deleted, which is somehow interfering with deletion of the files and folders.

[ilchenkob]

I had similar issue. It was reproducible only when I had my solution opened in Visual Studio. My workaround is to add a call to DeleteFiles before removing a directory (because the exception message states: "The directory is not empty.").

DeleteFiles(Combine(pathToDirectory, @".\**\*.*"));
DeleteDirectory(pathToDirectory, new DeleteDirectorySettings
{
    Force = true,
    Recursive = true
});

[ilchenkob]

The workaround provided in my previous message doesn't work, after few days I've got the same error.