要从哈希表中删除所有元素,代码如下-
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
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