DevOne.Utils.ErrorHandling 2.0.0

ErrorHandling

Installation

dotnet add package DevOne.Utils.ErrorHandling --version 2.0.0

Usage

• ErrorHandler with value as string

{
    string name = "marcos test";

    using (var eh = new ErrorHandler<string>())
    {
        switch (name.Length)
        {
            case < 3: // with indexer
                eh[nameof(name)] = "name length must be greater than 2";
                break;
            case > 25: // with method
                eh.Add(nameof(name), "name length must be less than 26");
                break;
            default:
                break;
        }

        var regex = new Regex(@"^[a-z0-9]+$");

        if (!regex.IsMatch(name))
        {
            eh.Add(nameof(name), "name format is invalid");
        }
    }
}

when the program get out of the using scope, if exists some error an exception of type new ErrorHandlerException<Error<string>> will throws.

if you want to verify errors in a specific part of your code, you can avoid using and use like that:

{
    string name = "marcos test";

    var eh = new ErrorHandler<string>();

    switch (name.Length)
    {
        case < 3:
            eh[nameof(name)] = "name length must be greater than 2";
            break;
        case > 25:
            eh[nameof(name)] = "name length must be less than 26";
            break;
        default:
            break;
    }

    var regex = new Regex(@"^[a-z0-9]+$");

    if (!regex.IsMatch(name))
    {
        eh[nameof(name)] = "name format is invalid";
    }

    ...

    eh.Dispose(); // verify the errors
}

if you want a diferent error value type use can do this like that:

• create a custom error value

{
    record CustomErrorValue(string Message, string Id, string Location);
}

• use this error value on error handler instance

{
    using (var eh = new ErrorHandler<CustomErrorValue>()) {}
}

• and now you need pass this type as the value

{
    eh["my key"] = new CustomErrorValue("message", "id", "location");
}

you can catch any exceptions from error handler like that:

try {
    ...
}
catch (ErrorHandlerBaseException exception)
{
    Console.WriteLine(exception.Message);

    foreach (var error in exception.Errors)
    {
        Console.WriteLine(error);
    }
}

this way will catch any type of exception that the ErrorHandler throws if you want to catch a specific exception type you can:

try {
    ...
}
catch (ErrorHandlerException<Error<string>> exception)
{
    Console.WriteLine(exception.Message);

    foreach (var error in exception.Errors)
    {
        Console.WriteLine($"{error.Key}: {error.Value}"); // you have intellisense
    }
}