Question

Is there a C# construct like the switch statement that allows control to fall through the next level? I have something like this:

    public static IEnumerable<string> SeverityOrHigher(string severity)
    {
        var result = new List<string>();

        switch (severity.ToUpper())
        {
            case "ALL":
                result.Add("ALL");
            case "DEBUG":
                result.Add("DEBUG");
            case "INFO":
                result.Add("INFO");
            case "WARN":
                result.Add("WARN");
            case "ERROR":
                result.Add("ERROR");
            case "FATAL":
                result.Add("FATAL");
            case "OFF":
                result.Add("OFF");
            default:
                break;
        }

        return result;
    }

…which clearly does not work in C#, (Control cannot fall through from one case label...) yet it seems to me like it should. I know it expects breaks in there, but that would not give me the data flow I’m looking for. What can be done to make this happen the way I’d like?

Answer 1

In your case you can emulate “falling case” with a little bit of LINQ:

public static IEnumerable<string> SeverityOrHigher(string severity)
{
    var result = new List<string>() 
        { "ALL", "DEBUG", "INFO", "WARN", "ERROR", "FATAL", "OFF" };
    return result.SkipWhile(l => l != severity.ToUpper()).ToArray();
}