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February 2, 2016 10:17
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switch文のcase内での変数のスコープが気持ちが悪かったので、変わりとなるものを作ってみたけど使い方がスマートでないので結局使わなかった。なのでせめてここに残しておきます。
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using System; | |
using System.Collections.Generic; | |
public class Switch<T> | |
{ | |
public Switch(T target) | |
{ | |
Target = target; | |
} | |
public Switch(T target, Dictionary<T, Action> cases) | |
{ | |
Target = target; | |
foreach (var i in cases) | |
Case(i.Key, i.Value); | |
} | |
public Switch(T target, Action defaultCase) | |
{ | |
Target = target; | |
_DefaultCase = defaultCase; | |
} | |
public Switch(T target, Dictionary<T, Action> cases, Action defaultCase) | |
{ | |
Target = target; | |
foreach (var i in cases) | |
Case(i.Key, i.Value); | |
_DefaultCase = defaultCase; | |
} | |
public T Target { get; private set; } | |
public Dictionary<T, Action> Cases { get; set; } = new Dictionary<T, Action>(); | |
private Action _DefaultCase { get; set; } | |
public void Case(T value, Action callback) | |
{ | |
foreach (var i in Cases) | |
if (i.Key.Equals(value)) | |
throw new ArgumentException($"'{value}'というケースはこのインスタンスに既に追加されています。"); | |
Cases.Add(value, callback); | |
} | |
public void DefaultCase(Action callback) | |
{ | |
_DefaultCase = callback; | |
} | |
public void Call() | |
{ | |
foreach(var i in Cases) | |
if (i.Key.Equals(Target)) | |
{ | |
i.Value(); | |
return; | |
} | |
_DefaultCase(); | |
} | |
} | |
public static class Sample | |
{ | |
public static void Main() | |
{ | |
string str = "hoge"; | |
var s = new Switch<string>(str); | |
s.Case("hoge", () => | |
{ | |
Console.WriteLine("Hoge"); | |
}); | |
s.Case("piyo", () => | |
{ | |
Console.WriteLine("Piyo"); | |
}); | |
s.Call(); | |
} | |
} |
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