从C#中的哈希表中删除所有元素
要从哈希表中删除所有元素，代码如下-
示例
using System;using System.Collections;
public class Demo {
public static void Main() {
Hashtable hash = new Hashtable(10);
hash.Add("1", "A");
hash.Add("2", "B");
hash.Add("3", "C");
hash.Add("4", "D");
hash.Add("5","E");
hash.Add("6", "F");
hash.Add("7", "G");
hash.Add("8","H");
hash.Add("9", "I");
hash.Add("10", "J");
Console.WriteLine("Hashtable Key and Value pairs...");
foreach(DictionaryEntry entry in hash) {
Console.WriteLine("{0} and {1} ", entry.Key, entry.Value);
}
Console.WriteLine("Is the Hashtable having fixed size? = "+hash.IsFixedSize);
Console.WriteLine("Count of entries in Hashtable = "+ hash.Count);
hash.Clear();
Console.WriteLine("Count of entries in Hashtable (updated) = "+hash.Count);
}
}
输出结果
这将产生以下输出-
Hashtable Key and Value pairs...10 and J
1 and A
2 and B
3 and C
4 and D
5 and E
6 and F
7 and G
8 and H
9 and I
Is the Hashtable having fixed size? = False
Count of entries in Hashtable = 10
Count of entries in Hashtable (updated) = 0
示例
让我们看另一个例子-
using System;using System.Collections;
public class Demo {
public static void Main() {
Hashtable hash = new Hashtable(10);
hash.Add("One", "100");
hash.Add("Two", "200");
hash.Add("Three", "300");
hash.Add("Four", "400");
hash.Add("Five","500");
Console.WriteLine("Hashtable Key and Value pairs...");
foreach(DictionaryEntry entry in hash) {
Console.WriteLine("{0} and {1} ", entry.Key, entry.Value);
}
Console.WriteLine("Count of entries in Hashtable = "+ hash.Count);
hash.Clear();
Console.WriteLine("Count of entries in Hashtable (updated) = "+hash.Count);
}
}
输出结果
这将产生以下输出-
Hashtable Key and Value pairs...One and 100
Five and 500
Three and 300
Two and 200
Four and 400
Count of entries in Hashtable = 5
Count of entries in Hashtable (updated) = 0
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