Input value always null on `onkeydown` or `onkeypress` event in Blazor

Input value always null on onkeydown or onkeypress event but have value on onclick event in Blazor.

Here is my code:

<input onkeydown="@CheckInput" placeholder="Write To Do" bind="@NewToDo" />
<button onclick="@AddToDo">Add todo</button>
<br />
<span class="text-danger">@errorMessage</span>

@functions {
    List<TodoItem> todos = new List<TodoItem>();
    private string NewToDo { get; set; }
    private string errorMessage;

    private void CheckInput()
    {
        Console.WriteLine(NewToDo); // Strangely input value always null here.
    }

    private void AddToDo()
    {
        if (!string.IsNullOrWhiteSpace(NewToDo)) // Here value is getting as expected
        {
            errorMessage = null;
            todos.Add(new TodoItem() { Title = NewToDo, IsDone = false });
            NewToDo = null;
        }
        else
        {
            errorMessage = "Please enter a To do item!";
        }

    }
}

Why I am getting input field value always null on onkeydown or onkeypress while getting the value on onclick?

[Boglen]

Try onkeydown=“@((__value) => NewToDo = __value)”

[Andrzej-W]

Read my comment here: https://github.com/aspnet/AspNetCore/issues/6052#issuecomment-450139089