Guys,
I have a question that I need some help with in regards to implementing an
interface.
I've been a VB programmer for most of my career and now I use C#. Some of
the functionality that I used in VB seems to be lacking in C#.
I wanted to know if it's my imagination or if there's a workaround.
The base problem is that I want to change the access level on interface
methods once they are implemented in a class. However, C# seems to cry and
such changes and VB seems to allow them. Here's the example:
Here's the VB example:
Public Interface IBusiness
Sub Remove()
Sub Save()
Property ID() As Guid
End Interface
Public MustInherit Class T
Implements IBusiness
Public MustOverride Sub DoStuff()
Protected Friend Overridable Property ID() As System.Guid Implements
IBusiness.ID
Get
End Get
Set(ByVal value As System.Guid)
End Set
End Property
Protected Friend Overridable Sub Remove() Implements IBusiness.Remove
End Sub
Protected Friend Overridable Sub Save() Implements IBusiness.Save
End Sub
End Class
Notice in this example that these methods are the implementation for
IBusiness, but I changed the access modifiers to Protected Friend instead of
public or something else.
Now, in C#, if I try to do the same, I get a compiler error:
public interface IBusiness {
void Remove();
void Save();
Guid ID { get; set;}
}
public abstract class T: IBusiness {
#region IBusiness Members
public void Remove() {
throw new Exception("The method or operation is not
implemented.");
}
public void Save() {
throw new Exception("The method or operation is not
implemented.");
}
public Guid ID {
get {
throw new Exception("The method or operation is not
implemented.");
}
set {
throw new Exception("The method or operation is not
implemented.");
}
}
#endregion
}
If I change the public members to protected or private I get an error. If I
change them to explicit implementation, then I cannot access them regardless
unless I cast to the interface.
What I'm want to do is implement an interface in a base class (so that I
don't have to implement it in every derived class) and then "re-implement"
for the derived class where necessary but have a protected internal access
modifier.
Any suggestions or am I barking up the wrong tree here?
Thanks,
Mike
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