LINQ ToDictionary() Method

In LINQ, ToDictionary() Method is used to convert the items of list/collection(IEnumerable<T>) to new dictionary object (Dictionary<TKey,TValue>) and it will optimize the list/collection items by required values only.

Syntax of LINQ ToDictionary Method

Here is the syntax of using the LINQ ToDictionary() operator.

C# Code

In the above syntax, we are converting the collection of "objStudent" to dictionary object and getting the only required filled value (ID and Name).

Example of ToDictionary method

Here is the example of using the LINQ ToDictionary operator to convert the collection to the new dictionary object.

using System;
using System. Collections;
using System.Collections.Generic;
using System. Linq;
using System. Text;
using System.Threading.Tasks;

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
//Create a object objStudent of Student class and add the information of student in the List
            List<Student> objStudent = new List<Student>()
            {
                new Student() { Id=1,Name = "Vinay Tyagi", Gender = "Male",Location="Chennai" },
                new Student() { Id=2,Name = "Vaishali Tyagi", Gender = "Female", Location="Chennai" },
                new Student() { Id=3,Name = "Montu Tyagi", Gender = "Male",Location="Bangalore" },
                new Student() { Id=4,Name = "Akshay Tyagi", Gender = "Male", Location ="Vizag"},
                new Student() { Id=5,Name = "Arpita Rai", Gender = "Male", Location="Nagpur"}
             };
    /*here with the help of ToDictionary() method we are converting the colection 
    of information in the form of dictionary and will fetch only the required information*/
                var student = objStudent.ToDictionary(x => x.Id, x => x.Name);
    //foreach loop is used to print the information of the student
                foreach (var stud in student)
                {
                    Console.WriteLine(stud.Key + "\t" + stud.Value);
                }
                Console.ReadLine();
    }
}
        class Student
        {
            public int Id { get; set; }
            public string Name { get; set; }
            public string Gender { get; set; }
            public string Location { get; set; }
         }
}

In the above example, we are converting the collection of "objStudent" to dictionary objects and getting the values from the two values (ID and Name).

OUTPUT: