In my project i'm using enums example:
public enum NcStepType { Start = 1, Stop = 3, Normal = 2 } i'm reading values from a database, but sometimes there are 0-values in my record, so i want an enum that looks like
public enum NcStepType { Start = 1 OR 0, Stop = 3, Normal = 2 } is this possible (in c#) ?
You could create a generic extension method that handles unknown values:
public static T ToEnum<T>(this int value, T defaultValue) { if (Enum.IsDefined(typeof (T),value)) return (T) (object) value; else return defaultValue; } Then you can simply call:
int value = ...; // value to be read NcStepType stepType = value.ToEnum(NcStepType.Start); // if value is defined in the enum, the corresponding enum value will be returned // if value is not found, the default is returned (NcStepType.Start) 
No, basically. You would have to give it one of the values (presumably the 1), and interpret the other (0) manually.
No it is not, and I'm not sure how it would work in practice.
Can't you just add logic that maps 0 to 1 when reading from the DB?
Normally i define in such cases the 0 as follows:
public enum NcStepType { NotDefined = 0, Start = 1, Normal = 2, Stop = 3, } And somewhere in code i would make an:
if(Step == NcStepType.NotDefined) { Step = NcStepType.Start; } This makes the code readable and everyone knows what happens... (hopefully)
No, in C# an enum can have only one value.
There's nothing that says the value in the database must map directly to your enum value however. You could very easily assign a value of Start whenever you read 0 or 1 from the database.
public enum NcStepType { Start = 1 | 0, Stop = 3, Normal = 2 } 
No solution in C#. But you can take 2 steps:
1. Set default value of your DB field to 1.
2. Update all existing 0 to 1.
As far as I know you can write this
enum NcStepType { Start = 0, Start = 1, Stop = 3, Normal = 2 } The only problem is later there would be no way telling which Start was used for variable initialization (it would always look like it was the Start = 0 one).
