public static int GetByteFlagIndex(this Enum value)
{
int maxIndex;
int currValue;
if (Enum.GetUnderlyingType(value.GetType()) == typeof(byte))
{
maxIndex = 8;
currValue = (byte)(object)value;
}
else if (Enum.GetUnderlyingType(value.GetType()) == typeof(int))
{
maxIndex = 32;
currValue = (int)(object)value;
}
else
{
throw new NotImplementedException(
string.Format("Enum '{0}' underlying type '{1}' does not supported", value.GetType(), Enum.GetUnderlyingType(value.GetType())));
}
for (int i = 0; i < maxIndex; i++)
{
var mask = Tools.GetMaskFromBits((byte)(i + 1), 0);
if ((currValue & mask) != 0)
{
return(i);
}
}
return(-1);
}