C#避免过长的IF和Switch分支的方法
1.最蠢形态
//很丑有没有！
//这个分支要是一两个还是可以接受的
class Program
{
static void Main(string[] args)
{
Command("播放");
Console.ReadKey();
}
public static void Command(String _command)
{
switch(_command)
{
case "播放":
Console.WriteLine("开始"+_command+"了！！");
break;
case "快进":
Console.WriteLine("开始" + _command + "了！！");
break;
case "暂停":
Console.WriteLine("开始" + _command + "了！！");
break;
case "结束":
Console.WriteLine("开始" + _command + "了！！");
break;
}
}
}
2.表驱动形态
//这个表驱动 还可以利用反射去做
//这个比上面的强多了有没有？
class Program
{
public static Dictionary<string, Action> dic;
static void Main(string[] args)
{
dic = new Dictionary<string, Action> {
{"播放", () => { Console.WriteLine("开始播放了！！"); }},
{"快进", () => { Console.WriteLine("开始快进了！！"); }},
{"暂停", () => { Console.WriteLine("开始暂停了！！");}}
};
//可以动态的添加命令和方法
dic.Add("结束", () => { Console.WriteLine("开始结束了！！"); });
Command(dic, "播放");
Command(dic, "快进");
Command(dic, "结束");
Command(dic, "快进两倍");
Console.ReadKey();
}
static void Command(Dictionary<string, Action> _dic,String _command)
{
if (_dic.ContainsKey(_command))
{
_dic[_command]();
}
else
{
Console.WriteLine("没有命令啊！！");
}
}
}
3.多态形态
//利用多态来处理
//好处就是再添加命令时候不用修改，直接添加命令类就可以了
class Program
{
static void Main(string[] args)
{
Commander _commander = new PlayCommander();
_commander.Execute();
_commander = new FinishCommander();
_commander.Execute();
_commander = new SpeedCommander();
_commander.Execute();
Console.ReadKey();
}
}
abstract class Commander
{
public abstract void Execute();
}
class PlayCommander : Commander
{
public override void Execute()
{
Console.WriteLine("开始播放了了！！");
}
}
class SpeedCommander : Commander
{
public override void Execute()
{
Console.WriteLine("开始快进了了！！");
}
}
class PauseCommander : Commander
{
public override void Execute()
{
Console.WriteLine("开始暂停了了！！");
}
}
class FinishCommander : Commander
{
public override void Execute()
{
Console.WriteLine("开始结束了了！！");
}
}