elemarjr/elemarjr.functionalcsharp

.NET implementations for common functional patterns and types.

ElemarJR.FunctionalCSharp

.NET implementations for common functional patterns and types.

• Option
• Either
• Try
• Untrusted

How to use

This library is avaiable as a NuGet Package.

Install-Package ElemarJR.FunctionalCSharp

How to learn about it?

If you are interested about my motivations, examples and/or functional programming using C#, read these posts:

• When null is not good enough
• Exceptions are too instrusive

elemarjr.functionalcsharp's Issues

Add support to multiple possible exceptions on Try type

I'm using this library for the first time, to use checked exceptions like Java´s, but I´m not able to add more than one possible exception.

In Java I can define a method's interface like this:

public Position Parent(Position v) throws InvalidPositionException, BoundaryViolationException;

But in C# using the FucntionalCSharp library, I'm not able to do this:

Try<InvalidPositionException, BoundaryViolationException, IPosition> Parent(IPosition value);

Do you think this would be a good addition? Please, let me know and if it is, I can work on a pull request to implement this feature.

Cannot use IEnumerable<T> as a TSuccess Type in Try

I created a method where I'd like to return an IEnumerable, but compiler cannot implicitly convert it to try<Exception, IEnumerable>. My code is just:

    public Try<Exception, IEnumerable<Person>> GetAll()
    {
        using (IDbConnection connection = new SqlConnection(ConnectionString))
        {
            try
            {
                return connection.Query<Person>(QueryGetAll); 
            }
            catch(Exception ex)
            {
                return ex;
            }
        }
    }

Using Try instead of void

I've seen some examples using Try when a method return something, like an object, or a collection.

But, how can I proceed when my method returns void?

Can I use something like this?

public Try<Exception, T> Create(User entity)
{
    // database creation stuff
}

What is the correct choice for T, if it shoud be void?