Issue—Blazor ValueChanged event did not fire with built-in input elements.

<EditForm Model="person">
    <DataAnnotationsValidator />
    <div class="form-group">
        <label for="name">Name</label>
        <InputText ValueChanged="@ValueChange" Value="@person.FirstName" ValueExpressions= "@( () => @person.FirstName )" Class="form-control" Id="name" />
    </div>
</EditForm>

@code { 
    Person person = new Person();
    public void ValueChange()
    {
        Console.WriteLine(person.FirstName);
    }
}

Instead, you can also use the OnValidSubmit form event to get and process the value.

<EditForm Model="person" OnValidSubmit="@ValueChange">
  <DataAnnotationsValidator />
   <div class="form-group">
     <label for="name">Name</label>
     <InputText @bind-Value="@person.FirstName" Class="form-control" Id="name" />
   </div>
</EditForm>

@code { 
    Person person = new Person();
    public void ValueChange()
    {
        Console.WriteLine(person.FirstName);
    }
}