Implementing interface C#

Question

I'm not new to C#, but I have found a behavior that is a little puzzling.

I have an interface

public interface IApplicationPage
{
    Person ThePerson { get; set;  }
    Application Application { get; set; }
}

I implement the interface on a page

public partial class tripapplication2 : System.Web.UI.Page, IApplicationPage
{
    Person IApplicationPage.ThePerson { get; set; }
    Application IApplicationPage.IApplicationPage.Application { get; set; }
}

However, when I attempt to reference ThePerson in the page itself I need to jump through hoops. For example.

1) ThePerson.Birthday

Gives an error saying "The name 'ThePerson' does not exist in the current context."

2) ((IMissionTripApplicationPage)this).ThePerson.Birthday

This works, but it looks awful.

Is there a better way to reference the implemented properties?

Can you show the specific code that doesn't work?

Samuel Carrijo
– Samuel Carrijo

2009-07-21 15:52:05 +00:00
Commented Jul 21, 2009 at 15:52 — Samuel Carrijo
– Samuel Carrijo, Commented Jul 21, 2009 at 15:52

JaredPar · Accepted Answer · 2009-07-21 15:50:24Z

23

It looks like you left a line out in your sample. I believe the ThePerson line in the implementation should read

Person IApplicationPage.ThePerson { get; set; }

This type of implementation is known as an explicit interface implementation. This means the member will only be viewable when the object is seen through a reference of the interface type.

If you want the member to be viewable through a concrete type reference, make it public and remove the explicit implementation

public Person ThePerson { get; set; }

answered Jul 21, 2009 at 15:50

JaredPar

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1 Comment

Daniel Over a year ago

Aboslutely right, I did leave out the line! (careless copying). Thanks Jared.

David M · Accepted Answer · 2009-07-21 16:08:29Z

3

Implement them as public properties:

public partial class tripapplication2 : System.Web.UI.Page, IApplicationPage
{
    public Person ThePerson { get; set; }
    public Application IApplicationPage.Application { get; set; }
}

Edit

Question now edited to show these were implemented originally as explicit. So, I should restate mine as implement them as public rather than explicit implementations of the properties.

edited Jul 21, 2009 at 16:08

answered Jul 21, 2009 at 15:50

David M

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2 Comments

mmmmmmmm Over a year ago

You cannot make explicit implementations public (Application IApplicationPage.Application is explicit!)

David M Over a year ago

It wasn't explicit when I answered. Quite right though of course.

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