Idea: Friendly use of ToString() about dunet

[domn1995]

Did some more research and if you seal the override in the union declaration, it should work exactly as intended. Here's an example:

using Dunet;
using static BusinessLogicResult<int>;

BusinessLogicResult<int> ok = new Ok(42);
BusinessLogicResult<int> notFound = new EntityNotFound();
BusinessLogicResult<int> unauthorized = new UnauthorizedAccess();

PrintResult(ok); // Prints "42"
PrintResult(notFound); // Prints "Not found."
PrintResult(unauthorized); // Prints "Unauthorized access."

static void PrintResult<T>(BusinessLogicResult<T> result) => Console.WriteLine(result.ToString());

[Union]
public partial record BusinessLogicResult<T>
{
    public partial record Ok(T Value);

    public partial record EntityNotFound();

    public partial record UnauthorizedAccess();

    public sealed override string ToString() =>
        Match(
            ok => ok.Value.ToString(),
            entityNotFound => "Not found.",
            unauthorizedAccess => "Unauthorized access."
        );
}

[harrison314]

Well thank you. I didn't know about this solution.

[domn1995]

Hey, thanks for contributing your idea!

I'm not sure if source generation is the right approach to this problem because it's really inflexible and only a little bit less code than overriding the ToString() methods yourself like this:

[Dunet.Union]
public partial record BussinesLogicResult<T>
{
    public partial record Ok(T Value)
    {
        public override string ToString() => Value.ToString();
    }

    public partial record EntityNotFound
    {
        public override string ToString() => "Not found.";
    }
        
    public partial record UnauthorizedAccess
    {
        public override string ToString() => "Unauthorized access.";
    }
}

Another simple alternative that I also think is better than source generation is creating your own extension method like this:

public static class BusinessLogicResultExtensions
{
    public static string ToStr<T>(this BusinessLogicResult<T> result) => 
        result.Match(
            ok => ok.Value.ToString(),
            entityNotFound => "Not found.",
            unauthorizedAccess => "Unauthorized access."
        );
}

[harrison314]

I'm not sure if source generation is the right approach to this problem because it's really inflexible and only a little bit less code than overriding the ToString() methods yourself like this:

That's not pretty code.

As a result, the simplicity and ease of use of Dunet is lost.

Another simple alternative that I also think is better than source generation is creating your own extension method like this:

I am talking about the ToString method because it is implicitly used in many places in C# applications (logging, debug view, orher recorded,...).