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