EditForm requires either a Model parameter, or an EditContext parameter

Question

How does one resolve this Blazor error?

EditForm requires either a Model parameter, or an EditContext parameter

I have created a minimally reproducible example below. The issue seems to be because the model is not instantiated...Why does the following simple page throw this error?

@page "/"
<EditForm @Model="@person">
    <input @bind="@person.FirstName" />
    <input @bind="@person.LastName" />
</EditForm>
@code 
{
    public Person person = new Person();
    protected override Task OnInitializedAsync()
    {
        person = new Person
        {
            FirstName = "Fred",
            LastName = "Flintstone"
        };
        return base.OnInitializedAsync();
    }
}

Answer 1

I can not only tell you the error, but tell you how to check it while typing in VS.

Change to this:

<EditForm Model="@person">

(i.e. with no "@" sign on Model)

When you're typing in the <Editform> line, when you press space, you'll see the list of expected variables, several of which start with @, like @ref, and several which do not, like Model.