C# enum contains value

Question

I have an enum

enum myEnum2 { ab, st, top, under, below}

I would like to write a function to test if a given value is included in myEnum

Answer 1

Also can use this:

    enum myEnum2 { ab, st, top, under, below }
    static void Main(string[] args)
    {
        myEnum2 r;
        string name = "ab";
        bool result = Enum.TryParse(name, out r);
    }

The result will contain whether the value is contained in enum or not.

Answer 2

If your question is like "I have an enum type, enum MyEnum { OneEnumMember, OtherEnumMember }, and I'd like to have a function which tells whether this enum type contains a member with a specific name, then what you're looking for is the System.Enum.IsDefined method:

Enum.IsDefined(typeof(MyEnum), MyEnum.OneEnumMember); //returns true
Enum.IsDefined(typeof(MyEnum), "OtherEnumMember"); //returns true
Enum.IsDefined(typeof(MyEnum), "SomethingDifferent"); //returns false

If your question is like "I have an instance of an enum type, which has Flags attribute, and I'd like to have a function which tells whether this instance contains a specific enum value, then the function looks something like this:

public static bool ContainsValue<TEnum>(this TEnum e, TEnum val) where Enum: struct, IComparable, IFormattable, IConvertible
{
    if (!e.GetType().IsEnum)
        throw new ArgumentException("The type TEnum must be an enum type.", nameof(TEnum));

    dynamic val1 = e, val2 = val;
    return (val1 | val2) == val1;
}

Hope I could help.

Answer 3

   public static T ConvertToEnum<T>(this string value)
    {
        if (typeof(T).BaseType != typeof(Enum))
        {
            throw new InvalidCastException("The specified object is not an enum.");
        }
        if (Enum.IsDefined(typeof(T), value.ToUpper()) == false)
        {
            throw new InvalidCastException("The parameter value doesn't exist in the specified enum.");
        }
        return (T)Enum.Parse(typeof(T), value.ToUpper());
    }

Answer 4

Why not use

Enum.IsDefined(typeof(myEnum), value);

BTW it's nice to create generic Enum<T> class, which wraps around calls to Enum (actually I wonder why something like this was not added to Framework 2.0 or later):

public static class Enum<T>
{
    public static bool IsDefined(string name)
    {
        return Enum.IsDefined(typeof(T), name);
    }

    public static bool IsDefined(T value)
    {
        return Enum.IsDefined(typeof(T), value);
    }

    public static IEnumerable<T> GetValues()
    {
        return Enum.GetValues(typeof(T)).Cast<T>();
    }
    // etc
}

This allows to avoid all this typeof stuff and use strongly-typed values:

Enum<StringSplitOptions>.IsDefined("None")