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

I think that you go wrong when using ToString().

Try making a Linq query

private bool EnumContainValue(Enum myEnum, string myValue)
{
    var query = from enumVal in Enum.GetNames(typeof(GM)).ToList()
                       where enumVal == myValue
                       select enumVal;

    return query.Count() == 1;
}

Answer 2

What you're doing with ToString() in this case is to:

Enum.GetValues(typeof(myEnum)).ToString()... instead you should write:

Enum.GetValues(typeof(myEnum).ToString()...

The difference is in the parentheses...

Answer 3

No need to write your own:

    // Summary:
    //     Returns an indication whether a constant with a specified value exists in
    //     a specified enumeration.
    //
    // Parameters:
    //   enumType:
    //     An enumeration type.
    //
    //   value:
    //     The value or name of a constant in enumType.
    //
    // Returns:
    //     true if a constant in enumType has a value equal to value; otherwise, false.

    public static bool IsDefined(Type enumType, object value);

Example:

if (System.Enum.IsDefined(MyEnumType, MyValue))
{
    // Do something
}

Answer 4

just cast the enum as:

string something = (string)myEnum;

and now comparison is easy as you like

Answer 5

Use the correct name of the enum (myEnum2).

Also, if you're testing against a string value you may want to use GetNames instead of GetValues.

Answer 6

just use this method

Enum.IsDefined Method - Returns an indication whether a constant with a specified value exists in a specified enumeration

Example

enum myEnum2 { ab, st, top, under, below};
myEnum2 value = myEnum2.ab;
 Console.WriteLine("{0:D} Exists: {1}", 
                        value, myEnum2.IsDefined(typeof(myEnum2), value));