C#元组 Pair Triplet Tuple

C#默认提供了Pair、Triplet 、Tuple（4.0新增加的）这三个元组，在一些小的数据结构使用时，我们可以不用去声明相应的数据结构，而用这些元组来替代。

public sealed class Pair{    // Fields    public object First;    public object Second;    // Methods    public Pair()    {    }    public Pair(object x, object y)    {        this.First = x;        this.Second = y;    }}

[Serializable]public sealed class Triplet{    // Fields    public object First;    public object Second;    public object Third;    // Methods    public Triplet()    {    }    public Triplet(object x, object y)    {        this.First = x;        this.Second = y;    }    public Triplet(object x, object y, object z)    {        this.First = x;        this.Second = y;        this.Third = z;    }}

以上这2个东东是表示2个、3个属性的可序列化对象。但是大家一定要注意它们的属性都是object，命名空间是System.Web.UI也就是说它们在System.Web.dll。

在。net4.0中 C#新增了Tuple 可以表示1-8个强类型属性的对象，在mscorlib.dll的System命名空间下

public static class Tuple{    // Methods    internal static int CombineHashCodes(int h1, int h2)    {        return (((h1 << 5) + h1) ^ h2);    }    internal static int CombineHashCodes(int h1, int h2, int h3)    {        return CombineHashCodes(CombineHashCodes(h1, h2), h3);    }    internal static int CombineHashCodes(int h1, int h2, int h3, int h4)    {        return CombineHashCodes(CombineHashCodes(h1, h2), CombineHashCodes(h3, h4));    }    internal static int CombineHashCodes(int h1, int h2, int h3, int h4, int h5)    {        return CombineHashCodes(CombineHashCodes(h1, h2, h3, h4), h5);    }    internal static int CombineHashCodes(int h1, int h2, int h3, int h4, int h5, int h6)    {        return CombineHashCodes(CombineHashCodes(h1, h2, h3, h4), CombineHashCodes(h5, h6));    }    internal static int CombineHashCodes(int h1, int h2, int h3, int h4, int h5, int h6, int h7)    {        return CombineHashCodes(CombineHashCodes(h1, h2, h3, h4), CombineHashCodes(h5, h6, h7));    }    internal static int CombineHashCodes(int h1, int h2, int h3, int h4, int h5, int h6, int h7, int h8)    {        return CombineHashCodes(CombineHashCodes(h1, h2, h3, h4), CombineHashCodes(h5, h6, h7, h8));    }    public static Tuple<T1> Create<T1>(T1 item1)    {        return new Tuple<T1>(item1);    }    public static Tuple<T1, T2> Create<T1, T2>(T1 item1, T2 item2)    {        return new Tuple<T1, T2>(item1, item2);    }    public static Tuple<T1, T2, T3> Create<T1, T2, T3>(T1 item1, T2 item2, T3 item3)    {        return new Tuple<T1, T2, T3>(item1, item2, item3);    }    public static Tuple<T1, T2, T3, T4> Create<T1, T2, T3, T4>(T1 item1, T2 item2, T3 item3, T4 item4)    {        return new Tuple<T1, T2, T3, T4>(item1, item2, item3, item4);    }    public static Tuple<T1, T2, T3, T4, T5> Create<T1, T2, T3, T4, T5>(T1 item1, T2 item2, T3 item3, T4 item4, T5 item5)    {        return new Tuple<T1, T2, T3, T4, T5>(item1, item2, item3, item4, item5);    }    public static Tuple<T1, T2, T3, T4, T5, T6> Create<T1, T2, T3, T4, T5, T6>(T1 item1, T2 item2, T3 item3, T4 item4, T5 item5, T6 item6)    {        return new Tuple<T1, T2, T3, T4, T5, T6>(item1, item2, item3, item4, item5, item6);    }    public static Tuple<T1, T2, T3, T4, T5, T6, T7> Create<T1, T2, T3, T4, T5, T6, T7>(T1 item1, T2 item2, T3 item3, T4 item4, T5 item5, T6 item6, T7 item7)    {        return new Tuple<T1, T2, T3, T4, T5, T6, T7>(item1, item2, item3, item4, item5, item6, item7);    }    public static Tuple<T1, T2, T3, T4, T5, T6, T7, Tuple<T8>> Create<T1, T2, T3, T4, T5, T6, T7, T8>(T1 item1, T2 item2, T3 item3, T4 item4, T5 item5, T6 item6, T7 item7, T8 item8)    {        return new Tuple<T1, T2, T3, T4, T5, T6, T7, Tuple<T8>>(item1, item2, item3, item4, item5, item6, item7, new Tuple<T8>(item8));    }}

其中的Tuple<...>都有[Serializable]属性表示可序列化。可见Tuple只是一个简单的工厂，使用它可以创建Tuple<...>类型的对象了。

至于使用我就不多说了，个人还是建议大家用Tuple而不要使用Pair 和Triplet