List gets updated when Model of EditForm changes. How to prevent?

Question

In my table, I have a List op type Person called PersonList. When a row is clicked, another object (Model) of type Person, is set to that value of that row, so my EditForm gets updated with that value. So far so good.

But when I change te value in my EditForm, my List get also updated with that value.

How is that possible? And how to prevet it?

Many thanks!

<h3>Component</h3>

<table>
   <thead>
       <tr>
           <th>ID</th>
           <th>Name</th>
           <th>Age</th>
       </tr>
   </thead>
   <tbody>
       @foreach (var person in PersonList)
       {
           <tr @onclick="@(() => ActivateItem(person))">
               <td>@person.Id</td>
               <td>@person.Name</td>
               <td>@person.Age</td>
           </tr>
       }
   </tbody>
</table>

<EditForm Model="Model">
    <InputText @bind-Value="Model.Name" />
    <InputNumber @bind-Value="Model.Age" />
</EditForm>


@code {

    private List<Person> PersonList = new List<Person>();
    private Person Model = new Person();

    private void ActivateItem(Person person)
    {
        Model = person;
    }

    public class Person
    {
        public int Id { get; set; }
        public string Name { get; set; }
        public int Age { get; set; }
    }

    protected override void OnInitialized()
    {
        PersonList.Add(new Person
        {
            Id = 1,
            Name = "Jack",
            Age = 20
        });

        PersonList.Add(new Person
        {
            Id = 2,
            Name = "Paul",
            Age = 25
        });

        PersonList.Add(new Person
        {
            Id = 3,
            Name = "Brad",
            Age = 30
        });
    }
}

Answer 1

Well, it is because you are keeping the reference to the object and bind-value is a two way binding. Not strange at all.

One solution is to use a one way binding and the other solution would be to remove the reference from the object by instansiate a new object. Something like this:

private void ActivateItem(Person person)
    {
        Model = new Person
        {
              Id = person.Id,
              Name = person.Name,
              Age = person.Age
         };
    }