计算C#中哈希表中键/值对的数量
要计算哈希表中键/值对的数量，代码如下-
示例
using System;using System.Collections;
public class Demo {
public static void Main() {
Hashtable hash = new Hashtable();
hash.Add("A", "SUV");
hash.Add("B", "MUV");
hash.Add("C", "AUV");
Console.WriteLine("Hashtable elements...");
foreach(DictionaryEntry d in hash) {
Console.WriteLine(d.Key + " " + d.Value);
}
Console.WriteLine("Count of Key/value pairs = "+hash.Count);
hash.Add("D", "Utility Vehicle");
hash.Add("E", "Convertible");
Console.WriteLine("Count of Key/value pairs (Updated) = "+hash.Count);
}
}
输出结果
这将产生以下输出-
Hashtable elements...C AUV
A SUV
B MUV
Count of Key/value pairs = 3
Count of Key/value pairs (Updated) = 5
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("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 key/value pairs in Hashtable = "+ hash.Count);
Console.WriteLine("\nEnumerator to iterate through the Hashtable...");
IDictionaryEnumerator demoEnum = hash.GetEnumerator();
while (demoEnum.MoveNext())
Console.WriteLine("Key = " + demoEnum.Key + ", Value = " + demoEnum.Value);
}
}
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 key/value pairs in Hashtable = 10
Enumerator to iterate through the Hashtable...
Key = 10, Value = J
Key = 1, Value = A
Key = 2, Value = B
Key = 3, Value = C
Key = 4, Value = D
Key = 5, Value = E
Key = 6, Value = F
Key = 7, Value = G
Key = 8, Value = H
Key = 9, Value = I
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