C＃のSortedDictionary.Keysプロパティ

C＃のSortedDictionary.Keysプロパティは、SortedDictionary のキーを含むコレクションを取得するために使用されます。

構文

構文は次のとおりです-

public System.Collections.Generic.SortedDictionary<TKey,TValue>.KeyCollection Keys { get; }

例

例を見てみましょう-

using System;
using System.Collections;
using System.Collections.Generic;
public class Demo {
   public static void Main(){
      SortedDictionary<int, string> sortedDict = new SortedDictionary<int, string>();
      sortedDict.Add(1, "SUV");
      sortedDict.Add(2, "MUV");
      sortedDict.Add(3, "Utility Vehicle");
      sortedDict.Add(4, "AUV");
      sortedDict.Add(5, "Hatchback");
      sortedDict.Add(6, "Convertible");
      Console.WriteLine("SortedDictionary key-value pairs...");
      IDictionaryEnumerator demoEnum = sortedDict.GetEnumerator();
      while (demoEnum.MoveNext())
         Console.WriteLine("Key = " + demoEnum.Key + ", Value = " + demoEnum.Value);
      Console.WriteLine("Count of SortedDictionary key-value pairs = "+sortedDict.Count);
      sortedDict.Add(7, "Seven");
      sortedDict.Add(8, "Eight");
      Console.WriteLine("\nSortedDictionary key-value pairs...UPDATED");
      demoEnum = sortedDict.GetEnumerator();
      while (demoEnum.MoveNext())
         Console.WriteLine("Key = " + demoEnum.Key + ", Value = " + demoEnum.Value);
      Console.WriteLine("Count of SortedDictionary key-value pairs (UPDATED) = "+sortedDict.Count);
      Console.WriteLine("Value in the SortedDictionary key-value pair key five = "+sortedDict[5]);
      sortedDict[5] = "Crossover";
      Console.WriteLine("Value in the SortedDictionary key-value pair key five (updated) = "+sortedDict[5]);
      SortedDictionary<int, string>.KeyCollection keyColl = sortedDict.Keys;
      Console.WriteLine("\nKeys...");
      foreach( int i in keyColl ){
         Console.WriteLine(i);
      }
   }
}

出力

これにより、次の出力が生成されます-

SortedDictionary key-value pairs...
Key = 1, Value = SUV
Key = 2, Value = MUV
Key = 3, Value = Utility Vehicle
Key = 4, Value = AUV
Key = 5, Value = Hatchback
Key = 6, Value = Convertible
Count of SortedDictionary key-value pairs = 6
SortedDictionary key-value pairs...UPDATED
Key = 1, Value = SUV
Key = 2, Value = MUV
Key = 3, Value = Utility Vehicle
Key = 4, Value = AUV
Key = 5, Value = Hatchback
Key = 6, Value = Convertible
Key = 7, Value = Seven
Key = 8, Value = Eight
Count of SortedDictionary key-value pairs (UPDATED) = 8
Value in the SortedDictionary key-value pair key five = Hatchback
Value in the SortedDictionary key-value pair key five (updated) = Crossover
Keys...
1
2
3
4
5
6
7
8

例

別の例を見てみましょう-

using System;
using System.Collections;
using System.Collections.Generic;
public class Demo {
   public static void Main(){
      SortedDictionary<int, string> sortedDict = new SortedDictionary<int, string>();
      sortedDict.Add(100, "Mobile");
      sortedDict.Add(200, "Laptop");
      sortedDict.Add(300, "Desktop");
      sortedDict.Add(400, "Speakers");
      sortedDict.Add(500, "Headphone");
      sortedDict.Add(600, "Earphone");
      Console.WriteLine("SortedDictionary key-value pairs...");
      IDictionaryEnumerator demoEnum = sortedDict.GetEnumerator();
      while (demoEnum.MoveNext())
         Console.WriteLine("Key = " + demoEnum.Key + ", Value = " + demoEnum.Value);
      Console.WriteLine("\nThe SortedDictionary has the key 200? = "+sortedDict.ContainsKey(200));
      SortedDictionary<int, string>.KeyCollection keyColl = sortedDict.Keys;
      Console.WriteLine("\nKeys...");
      foreach( int i in keyColl ){
         Console.WriteLine(i);
      }
   }
}

出力

これにより、次の出力が生成されます-

SortedDictionary key-value pairs...
Key = 100, Value = Mobile
Key = 200, Value = Laptop
Key = 300, Value = Desktop
Key = 400, Value = Speakers
Key = 500, Value = Headphone
Key = 600, Value = Earphone
The SortedDictionary has the key 200? = True
Keys...
100
200
300
400
500
600