SortedDictionary.Item[] Property in C#

The SortedDictionary.Item[] property in C# is used to get or set the value associated with the specified key.

Syntax

The syntax is as follows −

public TValue this[TKey k] { get; set; }

Above, the value k is the key of the value to get or set.

Example

Let us now see an example −

 Live Demo

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, "One");
      sortedDict.Add(2, "Two");
      sortedDict.Add(3, "Three");
      sortedDict.Add(4, "Four");
      sortedDict.Add(5, "Five");
      sortedDict.Add(6, "Six");
      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("
SortedDictionary 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.Clear();
      Console.WriteLine("
Count of SortedDictionary key-value pairs (UPDATED) = "+sortedDict.Count);
   }
}

Output

This will produce the following output −

Key = 1, Value = One
Key = 2, Value = Two
Key = 3, Value = Three
Key = 4, Value = Four
Key = 5, Value = Five
Key = 6, Value = Six
Count of SortedDictionary key-value pairs = 6
SortedDictionary key-value pairs...UPDATED
Key = 1, Value = One
Key = 2, Value = Two
Key = 3, Value = Three
Key = 4, Value = Four
Key = 5, Value = Five
Key = 6, Value = Six
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 = Five
Count of SortedDictionary key-value pairs (UPDATED) = 0

Example

Let us now see another example −

 Live Demo

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("
SortedDictionary 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]);
      sortedDict.Clear();
      Console.WriteLine("
Count of SortedDictionary key-value pairs (UPDATED) = "+sortedDict.Count);
   }
}

Output

This will produce the following output −

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
Count of SortedDictionary key-value pairs (UPDATED) = 0