在C#中要检查SortedList对象是否包含特定键,代码如下-
using System; using System.Collections; public class Demo { public static void Main() { SortedList list = new SortedList (); list.Add("A", "Books"); list.Add("B", "Electronics"); list.Add("C", "Appliances"); list.Add("D", "Pet Supplies"); list.Add("E", "Clothing"); list.Add("F", "Footwear"); Console.WriteLine("与键E关联的值 = "+list["E"]); list["E"] = "HDD"; Console.WriteLine("与键E关联的值 [更新后] = "+list["E"]); Console.Write("列表中是否有键C? = "+list.Contains("C")); } }
输出结果
这将产生以下输出-
与键E关联的值 = Clothing 与键E关联的值 [更新后] = HDD 列表中是否有键C? = True
现在让我们来看另一个示例-
using System; using System.Collections; public class Demo { public static void Main(String[] args) { SortedList sortedList = new SortedList(); sortedList.Add("A", "1"); sortedList.Add("B", "2"); sortedList.Add("C", "3"); sortedList.Add("D", "4"); sortedList.Add("E", "5"); sortedList.Add("F", "6"); sortedList.Add("G", "7"); sortedList.Add("H", "8"); sortedList.Add("I", "9"); sortedList.Add("J", "10"); Console.WriteLine("SortedList元素..."); foreach(DictionaryEntry d in sortedList) { Console.WriteLine("Key = "+d.Key + ", Value = " + d.Value); } Console.WriteLine("SortedList键-值对数 = "+sortedList.Count); sortedList.RemoveAt(3); Console.WriteLine("\n遍历SortedList的枚举器。。。"); IDictionaryEnumerator demoEnum = sortedList.GetEnumerator(); while (demoEnum.MoveNext()) Console.WriteLine("Key = " + demoEnum.Key + ", Value = "+ demoEnum.Value); Console.WriteLine("SortedList键值对计数(更新) = "+sortedList.Count); Console.WriteLine("\n列表中是否有键C? = "+sortedList.Contains("C")); Console.WriteLine("列表中是否有键M? = "+sortedList.Contains("M")); } }
输出结果
这将产生以下输出-
SortedList元素... Key = A, Value = 1 Key = B, Value = 2 Key = C, Value = 3 Key = D, Value = 4 Key = E, Value = 5 Key = F, Value = 6 Key = G, Value = 7 Key = H, Value = 8 Key = I, Value = 9 Key = J, Value = 10 SortedList键-值对数 = 10 遍历SortedList的枚举器。。。 Key = A, Value = 1 Key = B, Value = 2 Key = C, Value = 3 Key = E, Value = 5 Key = F, Value = 6 Key = G, Value = 7 Key = H, Value = 8 Key = I, Value = 9 Key = J, Value = 10 SortedList键值对计数(更新) = 9 列表中是否有键C? = True 列表中是否有键M? = False