要从ListDictionary中删除具有指定键的条目,代码如下-
using System; using System.Collections; using System.Collections.Specialized; public class Demo { public static void Main(){ ListDictionary dict1 = new ListDictionary(); dict1.Add("A", "Books"); dict1.Add("B", "Electronics"); dict1.Add("C", "Smart Wearables"); dict1.Add("D", "Pet Supplies"); dict1.Add("E", "Clothing"); dict1.Add("F", "Footwear"); Console.WriteLine("ListDictionary1 elements..."); foreach(DictionaryEntry d in dict1) { Console.WriteLine(d.Key + " " + d.Value); } ListDictionary dict2 = new ListDictionary(); 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("\nListDictionary2 elements..."); foreach(DictionaryEntry d in dict2) { Console.WriteLine(d.Key + " " + d.Value); } Console.WriteLine("Count of key/value pairs in Dictionary 2 = "+dict2.Count); dict2.Remove("4"); Console.WriteLine("Count of key/value pairs in Dictionary 2 (Updated) = "+dict2.Count); } }
输出结果
这将产生以下输出-
ListDictionary1 elements... A Books B Electronics C Smart Wearables D Pet Supplies E Clothing F Footwear ListDictionary2 elements... 1 One 2 Two 3 Three 4 Four 5 Five 6 Six Count of key/value pairs in Dictionary 2 = 6 Count of key/value pairs in Dictionary 2 (Updated) = 5
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() { ListDictionary dict = new ListDictionary(); dict.Add("1", "One"); dict.Add("2", "Two"); dict.Add("3", "Three"); dict.Add("4", "Four"); dict.Add("5", "Five"); dict.Add("6", "Six"); Console.WriteLine("ListDictionary elements..."); foreach(DictionaryEntry d in dict) { Console.WriteLine(d.Key + " " + d.Value); } Console.WriteLine("Count of key/value pairs in Dictionary = "+dict.Count); dict.Remove("2"); dict.Remove("3"); dict.Remove("4"); Console.WriteLine("Count of key/value pairs in Dictionary (Updated) = "+dict.Count); } }
输出结果
这将产生以下输出-
ListDictionary elements... 1 One 2 Two 3 Three 4 Four 5 Five 6 Six Count of key/value pairs in Dictionary = 6 Count of key/value pairs in Dictionary (Updated) = 3