How to EnumerateFiles with all subdirectories with C# DirectoryInfo?

I found this code that gets an array of files out of a DirectoryInfo :

FileInfo[] fileInfoArray = di.EnumerateFiles().Where(f => extensions.Contains(f.Extension.ToLower())).ToArray();

But it only searches the direct children of the path of DirectoryInfo. i.e., it does not include grandchildren.

I guess I need to add SearchOption.AllDirectories parameter to somewhere, but where?

I tried : 

di.EnumerateFiles(SearchOption.AllDirectories).Where(f => extensions.Contains(f.Extension.ToLower())).ToArray();

But it yields an error.

So how do I search with a pattern, including all subdirectories ?

Thanks for any help !

Jon Skeet
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quotationmark

Look at the overloads of DirectoryInfo.EnumerateFiles - there's no overload taking just a SearchOption, but you can give a string and a SearchOption:

var files = di.EnumerateFiles("*", SearchOption.AllDirectories)
              .Where(f => extensions.Contains(f.Extension.ToLower()))
              .ToArray();

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