從 C# 中的 HashSet 中刪除所有元素


要從 HashSet 中刪除所有元素,程式碼如下 −

示例

 示例演示

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);
   }
}

輸出

這會生成以下輸出 −

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

示例

我們再看一個示例 −

 示例演示

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);
   }
}

輸出

這會生成以下輸出 −

Elements in HashSet...
A
B
C
D
E
F
G
H
Count of HashSet1 = 8
Count of HashSet1 (updated) = 0

更新於: 05-12-2019

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