从C#中的哈希表中删除具有指定键的元素
要从哈希表中删除具有指定键的元素，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.Remove("5");
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) = 9
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", "Marketing");
hash.Add("Two", "Operations");
hash.Add("Three", "Finance");
hash.Add("Four", "IT");
hash.Add("Five","Sales");
hash.Add("Six", "Purchase");
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.Remove("Two");
hash.Remove("Three");
hash.Remove("Four");
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 Marketing
Five and Sales
Three and Finance
Two and Operations
Four and IT
Six and Purchase
Count of entries in Hashtable = 6
Count of entries in Hashtable (updated) = 3
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