In F# you can write an extension method like this:
Whilst this will work perfectly fine in your F# code, the extension method will not be visible to any C# code using the FileInfo type because F# and C# compiles extension methods differently.
To make C#-compatible extension methods in F#, here’s what you need to do instead:
That’s it, just follow these 3 simple steps and you’re done:
- wrap the extension methods inside a class decorated with the [<Extension>] attribute
- write the extension methods as static members where the first argument is of the type which should be extended (like how you would write an extension method in C#)
- mark the extension methods with the [<Extension>] attribute
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I’m an AWS Serverless Hero and the author of Production-Ready Serverless. I have run production workload at scale in AWS for nearly 10 years and I have been an architect or principal engineer with a variety of industries ranging from banking, e-commerce, sports streaming to mobile gaming. I currently work as an independent consultant focused on AWS and serverless.
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