【idior】.Net2.0的集合操作 --- What i know?
.Net2.0中提供的Array類
namespace System 
{ 
public abstract class Array { 
public static TOutput[] ConvertAll<TInput, TOutput>(TInput[] input, Converter<TInput, TOutput> cc); public static bool Exists<T>(T[] array, Predicate<T> match); public static T Find<T>(T[] array, Predicate<T> match); public static T FindLast<T>(T[] array, Predicate<T> match); public static T[] FindAll<T>(T[] array, Predicate<T> match); public static int FindIndex<T>(T[] array, Predicate<T> match); public static int FindLastIndex<T>(T[] array, Predicate<T> match); public static void ForEach<T>(T[] array, Action<T> action); public static void Sort<T>(T[] array, Comparison<T> comparer); public static bool TrueForAll<T>(T[] array, Predicate<T> match); 
} 
}
以上的集合操作使用到了下面的一些預先定義好的代理.(從他們的名字,你就可以明白他們是幹什麼的)
namespace System { public delegate void Action<T>(T item); public delegate int Comparer<T>(T first, T second); // result works like strcmp public delegate TOutput Converter<TInput, TOutput>(TInput input); public delegate bool Predicate<T>(T item); }
下面是一些例子
int[] list = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 }; 
int lastOdd = Array.FindLast(list, delegate(int n) { return n % 2 == 1; }); // lastOdd is 9 int[] evens = Array.FindAll(list, delegate(int n) { return n % 2 == 0; }); // evens contains { 2, 4, 6, 8, 10 } bool hasMultipleOfSeven = Array.Exists(evens, delegate(int n) { return n % 7 == 0; }); // hasMultipleOfSeven is false Array.Sort(evens, delegate(int a, int b) { return b - a; }); // evens is now { 10, 8, 6, 4, 2 } , you can define the sort algorithm by yourself string[] s = Array.ConvertAll<int, string>(evens, delegate(int n) { return "#" + n.ToString(); }); // s is { "#10", "#8", "#6", "#4", "#2" } this will be cool if the compiler could do the inferencing for ConvertAll
來自 “ ITPUB部落格 ” ，連結：http://blog.itpub.net/12639172/viewspace-349331/，如需轉載，請註明出處，否則將追究法律責任。
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