In this article, you will learn:

• How to initialize Dictionary before C# 6.0 ?
• How to initialize Dictionary in C# 6.0

How to initialize Dictionary before C# 6.0 ?

In C# 5, you would initialize the Dictionary with a {“Key”, “Value”} Pair. Let’s look at below example to understand it better.
 

Prior to C# 6.0:

using System.Collections.Generic;
 
namespace CsharpStar
{
    class Program
    {
        static void Main(string[] args)
        {
            var Books = new Dictionary<int, string> ()
            {
                 { 1, "ASP.net" },
                 { 2, "C#" },
                 { 3, "ASP.net MVC5" }
            };
 
            foreach (KeyValuePair<int, string> keyValuePair in Books)
            {
                Console.WriteLine(keyValuePair.Key + ": " +
                keyValuePair.Value + "\n");
            }
 
            Console.ReadLine();
        }
    }
}

 

Example in C# 6.0:

In C# 6, you can place the key between two square brackets [“Key”] and then set the value of the key [“Key”] = “value”.

using System.Collections.Generic;
using static System.Console;
 
namespace Csharpstar
{
    class Program
    {
        static void Main(string[] args)
        {
            var Books = new Dictionary<int, string> ()
            {
                [1] = "ASP.net",
                [2] = "C#",
                [3] = "ASP.net MVC5"
            };
 
            foreach (KeyValuePair<int, string> keyValuePair in Books)
            {
                WriteLine(keyValuePair.Key + ": " +
                keyValuePair.Value + "\n");
            }
 
            ReadLine();
        }
    }
}

 

Advantages:

– You can create and initialize objects with indexes at the same time.
– Initializing Dictionary is very easy with this new feature
– Any object that has an indexed getter or setter can be used with this syntax
 

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