获取 C# 中 Collection 中包含的元素数
若要获取 Collection 中包含的元素数,代码如下 −
示例
using System; using System.Collections.ObjectModel; public class Demo { public static void Main() { Collection<string> col = new Collection<string>(); col.Add("Andy"); col.Add("Kevin"); col.Add("John"); col.Add("Kevin"); col.Add("Mary"); col.Add("Katie"); col.Add("Barry"); col.Add("Nathan"); col.Add("Mark"); Console.WriteLine("Count of elements = "+ col.Count); Console.WriteLine("Iterating through the collection..."); var enumerator = col.GetEnumerator(); while (enumerator.MoveNext()) { Console.WriteLine(enumerator.Current); } } }
输出
将产生以下输出 −
Count of elements = 9 Iterating through the collection... Andy Kevin John Kevin Mary Katie Barry Nathan Mark
示例
我们来看另一个示例 −
using System; using System.Collections.ObjectModel; public class Demo { public static void Main() { Collection<int> col = new Collection<int>(); col.Add(10); col.Add(20); col.Add(30); col.Add(40); col.Add(50); col.Add(60); col.Add(70); col.Add(80); Console.WriteLine("Elements in the Collection..."); foreach(int val in col) { Console.WriteLine(val); } Console.WriteLine("Does the collection has the element 70? = "+col.Contains(70)); Console.WriteLine("Count of elements = " + col.Count); col.Clear(); Console.WriteLine("Count of elements (updated) = " + col.Count); } }
输出
将产生以下输出 −
Elements in the Collection... 10 20 30 40 50 60 70 80 Does the collection has the element 70? = True Count of elements = 8 Count of elements (updated) = 0
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