Question

Is it possible to use partial structs to achieve something like this:
Have an asp.net page base class with the following defined:

public partial struct QuerystringKeys
{
    public const string Username = "username";
    public const string CurrentUser = "currentUser";
}

Have an asp.net page, which inherits from the base class mentioned above, extend the partial declaration:

public partial struct QuerystringKeys
{
    /// <summary>
    /// The page number of the review instances list
    /// </summary>
    public const string Page = "page";
}

The final goal is a QuerystringKeys struct with all three constant strings defined in it available to the asp.net page.

Answer 1

No, you cannot do that. When you are taliking about the ASP .NET pages, I assume you want the struct to be contained within the page class declaration (if not, why don’t you just put it in a separate code file) ?

If your struct is only intended to hold constant strings, use a class and inherit from the base. Since you won’t be creating instances of it, there will be no difference:

public class Test : Page
{
    internal class QuerystringKeys : BasePage.QuerystringKeys
    {            
        public const string Page = "page";
    }
}

public class BasePage : Page
{
    internal class QuerystringKeys
    {
        public const string Username = "username";
        public const string CurrentUser = "currentUser";
    }
}