要从HashSet中删除所有元素,代码如下-
using System; using System.Collections.Generic; public class Demo { public static void Main(String[] args){ HashSet<string> set1 = new HashSet<string>(); set1.Add("A"); set1.Add("B"); set1.Add("C"); set1.Add("D"); set1.Add("E"); set1.Add("F"); set1.Add("G"); set1.Add("H"); Console.WriteLine("Elements in HashSet1..."); foreach (string res in set1){ Console.WriteLine(res); } HashSet<string> set2 = new HashSet<string>(); set2.Add("John"); set2.Add("Jacob"); set2.Add("Ryan"); set2.Add("Tom"); set2.Add("Andy"); set2.Add("Tim"); set2.Add("Steve"); set2.Add("Mark"); Console.WriteLine("Elements in HashSet2..."); foreach (string res in set2){ Console.WriteLine(res); } Console.WriteLine("Is HashSet1 equal to HashSet2? = "+set1.Equals(set2)); Console.WriteLine("Count of HashSet2 = "+set2.Count); set2.Clear(); Console.WriteLine("Count of HashSet2 (updated) = "+set2.Count); } }
输出结果
这将产生以下输出-
Elements in HashSet1... A B C D E F G H Elements in HashSet2... John Jacob Ryan Tom Andy Tim Steve Mark Is HashSet1 equal to HashSet2? = False Count of HashSet2 = 8 Count of HashSet2 (updated) = 0
让我们看另一个例子-
using System; using System.Collections.Generic; public class Demo { public static void Main(String[] args){ HashSet<string> set1 = new HashSet<string>(); set1.Add("A"); set1.Add("B"); set1.Add("C"); set1.Add("D"); set1.Add("E"); set1.Add("F"); set1.Add("G"); set1.Add("H"); Console.WriteLine("Elements in HashSet..."); foreach (string res in set1){ Console.WriteLine(res); } Console.WriteLine("Count of HashSet1 = "+set1.Count); set1.Clear(); Console.WriteLine("Count of HashSet1 (updated) = "+set1.Count); } }
输出结果
这将产生以下输出-
Elements in HashSet... A B C D E F G H Count of HashSet1 = 8 Count of HashSet1 (updated) = 0