LINQ Partitioning Operator

最新推荐文章于 2019-09-21 04:36:48 发布

原创最新推荐文章于 2019-09-21 04:36:48 发布 · 811 阅读

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本文介绍如何利用C#中的Enumerable扩展方法，如Take、Skip、TakeWhile和SkipWhile，对数组进行高效的数据筛选和提取操作。

		private static readonly int[] numbers = { 5, 4, 1, 3, 9, 8, 6, 7, 2, 0 };
        static void Main()
        {
			UseTakeMethod();
			UseSkipMethod();
			UseTakeWhileMethod();
			UseSkipWhileMethod();
        }
		public static void UseTakeMethod()
		{
			var takeNumbers = numbers.Take(3);
			Console.WriteLine("First three numbers");
			foreach (var number in takeNumbers)
			{
				Console.WriteLine("{0}", number);
			}
		}
		public static void UseSkipMethod()
		{
			var skipNumbers = numbers.Skip(4);
			Console.WriteLine("Get all but skip first four element");
			foreach (var number in skipNumbers)
			{
				Console.WriteLine("{0}", number);
			}
		}
		public static void UseTakeWhileMethod()
		{
			var takeWhileNumbers = numbers.TakeWhile((n, index) => n > index);
			Console.WriteLine("Get first element not less than position");
			foreach (var number in takeWhileNumbers)
			{
				Console.WriteLine("{0}", number);
			}
		}
		public static void UseSkipWhileMethod()
		{
			var skipWhileNumbers = numbers.SkipWhile(n => n > 2);
			Console.WriteLine("A specify condition is true that return remaining elements");
			foreach (var number in skipWhileNumbers)
			{
				Console.WriteLine("{0}", number);
			}
		}