Dictionary

Basic Syntax

• Different Collection Type

  Dictionary<int,string> books= new Dictionary<int,string>();
  books.Add(1, "The Way of Kings");
  books.Add(2,"Words or Radiance");
  books.Add(3, "Oathbringer");
  books.Add(4,"Rhythm of War");
  
  //Loop through each item 
  foreach (var book in books)
  {
      Console.WriteLine( $"{book.Key},{book.Value}" );
  }
  
  //Loop using Unique ID
  for (int i = 1; i < books.Count+1; i++)
  {
      Console.WriteLine($"{i},{books[i]}");
  }
  
  //Loop Using Index + Linq
  for (int i = 0; i < books.Count; i++)
  {
      var book = books.ElementAt(i);
      Console.WriteLine($"{book.Key},{book.Value}");
  }
  

Find Key in Dictionary

if (!AuthorList.ContainsKey("Mahesh Chand"))
{
    AuthorList["Mahesh Chand"] = 20;
}

Find Value in Dictionary

if (!AuthorList.ContainsValue(9))
{
    Console.WriteLine("Item found");
}