How to update value in a List using LINQ

Question

I have a list which I want to update using LINQ.

class Student
{
    private string name;
    private int marks;
    public string Name { get; set;}
    pub         


        

Answer 1

Objects are stored by reference in the list so you can recover object via linq and then edit, it will be reflect the changes on the list.

Example

    static void Main(string[] args)
        {
            List testList = new List()
            {
                new Entity() {Id = 1, Text = "Text"},
                new Entity() {Id = 2, Text = "Text2"}
            };

            Console.WriteLine($"First text value:{testList[1].Text}");

            Entity entityToEdit = testList.FirstOrDefault(e => e.Id == 2);
            if (entityToEdit != null)
                entityToEdit.Text = "Hello You!!";

            Console.WriteLine($"Edited text value:{testList[1].Text}");
            
            Console.ReadLine();
        }

 internal class Entity
    {
        public int Id { get; set; }
        public String Text { get; set; }
    }

Testing the app you will get the follow result:

First text value:Text2

Edited text value:Hello You!!