/// <summary>
/// Throws a System.ComponentModel.InvalidEnumArgumentException with the specified message.
/// The parameter name for the exception will be the value of ensureArg.ArgumentName.
/// </summary>
/// <typeparam name="TEnum">The type parameter of the IEnsureArg instance.</typeparam>
/// <param name="ensureArg">The IEnsureArg instance to throw an exception for.</param>
/// <param name="exceptionMessage">
/// The message to use in the exception. If no exception message is supplied then
/// ensureArg.ExceptionMessage will be used.
/// </param>
public static void ThrowInvalidEnumArgumentException <TEnum>(
this IEnsureArg <TEnum> ensureArg,
string exceptionMessage)
where TEnum : struct, IComparable, IFormattable // Closest we can get to System.Enum and be CLSCompliant.
{
string message = ensureArg.FormatInvalidEnumArgumentException(exceptionMessage);
if (message == null)
{
int enumValue = Convert.ToInt32(ensureArg.Value, CultureInfo.InvariantCulture);
throw new InvalidEnumArgumentException(ensureArg.ArgumentName, enumValue, ensureArg.Value.GetType());
}
throw new InvalidEnumArgumentException(message);
}