检查 SortedList 对象是否在 C# 中包含某个特定键?


要检查 SortedList 对象是否在 C# 中包含特定键,代码如下 −

示例

 在线演示

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("Value associated with key E = "+list["E"]);
      list["E"] = "HDD";
      Console.WriteLine("Value associated with key E [Updated] = "+list["E"]);
      Console.Write("Does the list has key C? = "+list.Contains("C"));
   }
}

输出

这将生成以下输出 −

Value associated with key E = Clothing
Value associated with key E [Updated] = HDD
Does the list has key C? = True

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示例

现在我们来看另一个示例 −

 在线演示

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 elements...");
      foreach(DictionaryEntry d in sortedList) {
         Console.WriteLine("Key = "+d.Key + ", Value = " + d.Value);
      }
      Console.WriteLine("Count of SortedList key-value pairs = "+sortedList.Count);
      sortedList.RemoveAt(3);
      Console.WriteLine("
Enumerator to iterate through the SortedList...");       IDictionaryEnumerator demoEnum = sortedList.GetEnumerator();       while (demoEnum.MoveNext())       Console.WriteLine("Key = " + demoEnum.Key + ", Value = "+ demoEnum.Value);       Console.WriteLine("Count of SortedList key-value pairs (Updated) = "+sortedList.Count);       Console.WriteLine("
Does the list has key C? = "+sortedList.Contains("C"));       Console.WriteLine("Does the list has key M? = "+sortedList.Contains("M"));    } }

输出

这将生成以下输出 −

SortedList elements...
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
Count of SortedList key-value pairs = 10
Enumerator to iterate through the SortedList...
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
Count of SortedList key-value pairs (Updated) = 9
Does the list has key C? = True
Does the list has key M? = False

更新于:2019 年 12 月 16 日

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