Check whether a SortedList object contains a specific key in C#?

To check whether a SortedList object contains a specific key in C#, the code is as follows −

Example

 Live Demo

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"));
   }
}

Output

This will produce the following output −

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

Example

Let us now see another example −

 Live Demo

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"));
   }
}

Output

This will produce the following output −

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