要获取OrderedDictionary中包含的键/值对的数量,代码如下-
using System; using System.Collections; using System.Collections.Specialized; public class Demo { public static void Main(){ OrderedDictionary dict = new OrderedDictionary(); dict.Add("A", "Home Appliances"); dict.Add("B", "Electronics"); dict.Add("C", "Smart Wearables"); dict.Add("D", "Pet Supplies"); dict.Add("E", "Clothing"); dict.Add("F", "Footwear"); Console.WriteLine("OrderedDictionary elements..."); foreach(DictionaryEntry d in dict){ Console.WriteLine(d.Key + " " + d.Value); } Console.WriteLine("Count of elements in OrderedDictionary = " + dict.Count); dict.Clear(); Console.WriteLine("Count of elements in OrderedDictionary (Updated)= " + dict.Count); } }
输出结果
这将产生以下输出-
OrderedDictionary elements... A Home Appliances B Electronics C Smart Wearables D Pet Supplies E Clothing F Footwear Count of elements in OrderedDictionary = 6 Count of elements in OrderedDictionary (Updated)= 0
让我们看另一个例子-
using System; using System.Collections; using System.Collections.Specialized; public class Demo { public static void Main(){ OrderedDictionary dict1 = new OrderedDictionary(); dict1.Add("A", "John"); dict1.Add("B", "Andy"); dict1.Add("C", "Jacob"); dict1.Add("D", "Kevin"); dict1.Add("E", "Gary"); dict1.Add("F", "Nathan"); dict1.Add("G", "Kevin"); dict1.Add("H", "Ryan"); Console.WriteLine("OrderedDictionary1 elements..."); foreach(DictionaryEntry d in dict1){ Console.WriteLine(d.Key + " " + d.Value); } Console.WriteLine("Count of key-value pairs in OrderedDictionary1 = " + dict1.Count); OrderedDictionary dict2 = new OrderedDictionary(); dict2.Add("1", "One"); dict2.Add("2", "Two"); dict2.Add("3", "Three"); dict2.Add("4", "Four"); dict2.Add("5", "Five"); dict2.Add("6", "Six"); Console.WriteLine("\nOrderedDictionary2 elements..."); foreach(DictionaryEntry d in dict2){ Console.WriteLine(d.Key + " " + d.Value); } Console.WriteLine("Count of key-value pairs in OrderedDictionary2 = " + dict2.Count); Console.WriteLine("\nIs OrderedDictionary1 equal to OrderedDictionary2? = "+(dict1.Equals(dict2))); OrderedDictionary orderedDict = dict2.AsReadOnly(); Console.WriteLine("Is OrderedDictionary read-only? = "+orderedDict.IsReadOnly); } }
输出结果
这将产生以下输出-
OrderedDictionary1 elements... A John B Andy C Jacob D Kevin E Gary F Nathan G Kevin H Ryan Count of key-value pairs in OrderedDictionary1 = 8 OrderedDictionary2 elements... 1 One 2 Two 3 Three 4 Four 5 Five 6 Six Count of key-value pairs in OrderedDictionary2 = 6 Is OrderedDictionary1 equal to OrderedDictionary2? = False Is OrderedDictionary read-only? = True