要从集合中删除所有元素,代码如下-
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); } }
输出结果
这将产生以下输出-
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
让我们看另一个例子-
using System; using System.Collections.ObjectModel; public class Demo { public static void Main() { Collection<String> col = new Collection<String>(); col.Add("A"); col.Add("B"); col.Add("C"); col.Add("D"); col.Add("E"); Console.WriteLine("Elements in the Collection..."); foreach(String val in col) { Console.WriteLine(val); } Console.WriteLine("Does the collection has the element D? = "+(col.Contains("D"))); Console.WriteLine("Count of elements = " + col.Count); col.Clear(); Console.WriteLine("Count of elements (updated) = " + col.Count); } }
输出结果
这将产生以下输出-
Elements in the Collection... A B C D E Does the collection has the element D? = True Count of elements = 5 Count of elements (updated) = 0