Do All HTML attributes require a @ in ASP.NET MVC

Question

I am working on a project that declares html attributes as @class = "className" or @id = "ID" however for this form control it does not happen:

@Html.CheckBoxFor(Model => Model.IsEBSCreated, new { disabled = "disabled" })

Questions:

1. Why does the HTML attribute disabled not have an @ symbol before it?
2. Is the @ symbol not always required?
3. Does the HTML attribute checked require an @ symbol?

Thank you

Answer 1

• The @ prefix on an identifier in C# allows language keywords to be used as identifiers, aka verbatim identifier.
• Read this: https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/tokens/verbatim
• Note that you don't need to use @ with C#'s contextual keywords like from and where - only C#'s reserved keywords.

Why does the HTML attribute disabled not have an @ symbol before it?

Because disabled is not a C# language keyword.

Is the @ symbol not always required?

Only when you're using a C# language keyword as an identifier.

Does the HTML attribute checked require an @ symbol?

Yes, because checked (and unchecked) are C# language keywords.

---

For example:

public interface @interface
{
    string? @string { get; }
}

public class @class : @interface
{
    private static readonly string? @null = null;
    string? @interface.@string => @null;
}

Feel free to use the above code in a team project if you happen to dislike a particular member of your team.