Custom exceptions in F#

We can build custom exceptions in F# with the exception keyword. We can also assign multiple parameters to it in a tuple:

exception ProductNotFoundException of string * int * int

We can raise a custom exception with the raise function. The with clause will have a pattern matching section where we can decide what to do with the various exception types:

let customExceptionRaise =
    try
        raise (ProductNotFoundException("Book", 10, 543665))
    with
        | ProductNotFoundException(productName, quantity, id) ->
            printfn "We don't have %d pieces of product name %s id %d" quantity productName id

Executing this function will produce the following output:

We don’t have 10 pieces of product name Book id 543665

View all F# related articles here.

Advertisements

About Andras Nemes
I'm a .NET/Java developer living and working in Stockholm, Sweden.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

ultimatemindsettoday

A great WordPress.com site

Elliot Balynn's Blog

A directory of wonderful thoughts

Robin Sedlaczek's Blog

Developer on Microsoft Technologies

Softwarearchitektur in der Praxis

Wissenswertes zu Webentwicklung, Domain-Driven Design und Microservices

Technology Talks

on Microsoft technologies, Web, Android and others

Software Engineering

Web development

Disparate Opinions

Various tidbits

chsakell's Blog

WEB APPLICATION DEVELOPMENT BEST PRACTICES WITH MICROSOFT STACK & ANGULAR

Cyber Matters

Bite-size insight on Cyber Security for the not too technical.

Guru N Guns's

OneSolution To dOTnET.

Johnny Zraiby

Measuring programming progress by lines of code is like measuring aircraft building progress by weight.

%d bloggers like this: