Question

been looking but not much luck, i want to create a function that only allows certain items to be passed as the first parameter.

e.g. it should only allow the following strings:

"error", "warning", "info"

then the call would be

showme("error");
or showme("warning");
or showme("info");

can this be done? I know I can define

showme(string type){}

but ideally I need showme(string type "error"){}

Answer 1

I suggest an enum

public enum ErrorType {
    error,
    warning,
    info
}

public void ShowMe(ErrorType errorType) {
    switch (errorType) {
        case ErrorType.error:
        //do stuff
        break;
        case ErrorType.warning:
        //do stuff
        break;
        case ErrorType.info:
        //do stuff
        break;
        default:
        throw new ArgumentException("Invalid argument supplied");
        break;
    }
}

//Invoke the method
ShowMe(ErrorType.info);