C# 枚举类型初试

枚举类型的简单定义

public enum Seasons
{ 
	Spring,	
	Summer,	
	Autumn,	
	Winner	
}
void TestEnum(){
	Seasons s =Seasons.Winner;
	Console.WriteLine(s);
	Console.ReadKey();
}

枚举类型与其他类型的强转```

1）将枚举类型强转成int类型

Seasons season = Seasons.Summer;
int n = (int) season;
Console.WriteLine(n);
Console.WriteLine((int)Seasons.Autumn);

2）将int类型强转为枚举类型

int n1 = 3;
Seasons season = (Seasons) n1 ; 
Console.WriteLine(season);

3）将枚举类型转换成字符串类型

//所有的类型都能够转换成string类型
Seasons season = Seasons.Spring;
string s = season.ToString();
Console.WriteLine(s);

4）将字符串类型转换为枚举类型

string s = "aaa";
Seasons season = （Seasons)Enum.Parse(typeof(Seasons),s);
//Convert.ToInt32();
int.Parse() ; int.TryParse();
Console.WriteLine(season);

5. 小栗子

public enum QQState
    {
        OnLine=1,
        OffLine,
        Leave,
        Busy,
        QMe
    }


public void Test(){
//枚举练习
//提示用户选择一个在线状态，我们接受，并将用户的输入转换成枚举类型。
//再次打印到控制台中
Console.WriteLine("请选择您的qq在线状态 1--OnLine 2--OffLine 3--Leave 4--Busy
5--QMe");
string input = Console.ReadLine();
switch (input)
 {
	case "1": QQState s1 = (QQState)Enum.Parse(typeof(QQState), input);
		Console.WriteLine("您选择的在线状态是{0}",s1);
		break;
	case "2": QQState s2 = (QQState)Enum.Parse(typeof(QQState), input);
		Console.WriteLine("您选择的在线状态是{0}",s2);
		break;
	case "3": QQState s3 = (QQState)Enum.Parse(typeof(QQState), input);
		Console.WriteLine("您选择的在线状态是{0}",s3);
		break;
	case "4": QQState s4 = (QQState)Enum.Parse(typeof(QQState), input);
		Console.WriteLine("您选择的在线状态是{0}", s4);
		break;
	case "5": QQState s5 = (QQState)Enum.Parse(typeof(QQState), input);
		Console.WriteLine("您选择的在线状态是{0}", s5);
		break;
}
Console.ReadKey();

}