C＃のEnumについて

public enum Difficulty { Easy, Normal, Hard };

for(var i=0;i<(int)Difficulty.Hard+1;i++)

public enum Difficulty { Easy, Normal, Hard, Extreme };

for(var i=0;i<(int)Difficulty.Extreme+1;i++)

public enum Difficulty { Easy, Normal, Hard, Extreme, MAX };
for(var i=0;i<(int)Difficulty.MAX;i++)

Enum.GetValues(typeof(Difficulty))

Enum.GetNames(typeof(Difficulty))

Enum.GetNames(typeof(Difficulty)).Length

for(var i=0;i<Enum.GetNames(typeof(Difficulty)).Length;i++)

foreach(string str in Enum.GetValues(typeof(Difficulty)))

string str=diff.ToString();

Difficulty diff=(Difficulty)Enum.Parse(typeof(Difficulty), str);

if (Enum.IsDefined(typeof(Difficulty), str))