Binding to Business Objects and Generic List

[ME]

I have an object we'll call it MyObject. MyObject has a property calld
MyBusinessObjec ts of type List<IMyBusines sObject2>. IMyBusinessObje ct2 is a
defined interface in my application (See below). I want to bind the
MyBusinessObjec ts property to a ComboBox as follows:

ComboBox cbData = new ComboBox();
BindingSource bsSource = new BindingSource() ;

bsSource.DataSo urce = MyObject.MyBusi nessObjects;
cbData.DisplayM emeber = "Text";
cbData.ValueMem ber = "Index";

cbData.DataSour ce = bsSource;
When I run the code I get just the type name (like
'namespace.MyBu sinessObjects') of the object in the drop down or I will get
an error that says that the field "Text" does not exist. However if I
change the object in the collection to use the base interface
(IMyBusinessObj ect) it works fine. How can I bind a control to a business
object that uses an extended interface?

Thanks,

Matt

---------------------------------------------------
public interface IMyBusinessObje ct2 : IMyBusinessObje ct
{

}

public interface IMyBusinessObje ct
{
int Index
{
get;
set;
}
string Text
{
get;
set;
}
}

[Chris Jobson]

"ME" <tr*********@co mcast.netREMOVE THIS> wrote in message
news:PN******** ************@co mcast.com...

I have an object we'll call it MyObject. MyObject has a property calld
MyBusinessObje cts of type List<IMyBusines sObject2>. IMyBusinessObje ct2 is
a defined interface in my application (See below). I want to bind the
MyBusinessObje cts property to a ComboBox as follows:

ComboBox cbData = new ComboBox();
BindingSource bsSource = new BindingSource() ;

bsSource.DataSo urce = MyObject.MyBusi nessObjects;
cbData.DisplayM emeber = "Text";
cbData.ValueMem ber = "Index";

cbData.DataSour ce = bsSource;
When I run the code I get just the type name (like
'namespace.MyBu sinessObjects') of the object in the drop down or I will
get an error that says that the field "Text" does not exist. However if I
change the object in the collection to use the base interface
(IMyBusinessObj ect) it works fine. How can I bind a control to a business
object that uses an extended interface?

I've no idea why it doesn't work (though I'd very much like to know!). The
only workround I've found is rather nasty - convert the list to a
List<IMyBusines sObject> before binding, e.g.:

Converter<IMyBu sinessObject2, IMyBusinessObje ct> conv = delegate
(IMyBusinessObj ect2 obj) { return obj; };
bsSource.DataSo urce =
MyObject.MyBusi nessObjects.Con vertAll<IMyBusi nessObject>(con v);

Chris Jobson

[ME]

So I would have to conclude that to be a bug in .NET 2 then. If say the
"Text" property was defined in IMyBusinessObje ct and the "Index" property
was defined in IMyBusinessObje ct2 one would be pretty much up the creek with
out a paddle. This has BIG implications when you need to do this type of
binding to a DataGridView.

Thanks,

Matt
"Chris Jobson" <ch**********@b tinternet.com> wrote in message
news:ey******** *****@TK2MSFTNG P05.phx.gbl...

"ME" <tr*********@co mcast.netREMOVE THIS> wrote in message
news:PN******** ************@co mcast.com...

I have an object we'll call it MyObject. MyObject has a property calld
MyBusinessObj ects of type List<IMyBusines sObject2>. IMyBusinessObje ct2 is
a defined interface in my application (See below). I want to bind the
MyBusinessObj ects property to a ComboBox as follows:

ComboBox cbData = new ComboBox();
BindingSource bsSource = new BindingSource() ;

bsSource.DataSo urce = MyObject.MyBusi nessObjects;
cbData.DisplayM emeber = "Text";
cbData.ValueMem ber = "Index";

cbData.DataSour ce = bsSource;
When I run the code I get just the type name (like
'namespace.MyBu sinessObjects') of the object in the drop down or I will
get an error that says that the field "Text" does not exist. However if
I change the object in the collection to use the base interface
(IMyBusinessObj ect) it works fine. How can I bind a control to a
business object that uses an extended interface?

I've no idea why it doesn't work (though I'd very much like to know!). The
only workround I've found is rather nasty - convert the list to a
List<IMyBusines sObject> before binding, e.g.:

Converter<IMyBu sinessObject2, IMyBusinessObje ct> conv = delegate
(IMyBusinessObj ect2 obj) { return obj; };
bsSource.DataSo urce =
MyObject.MyBusi nessObjects.Con vertAll<IMyBusi nessObject>(con v);

Chris Jobson

[SP]

"ME" <tr*********@co mcast.netREMOVE THIS> wrote in message
news:PN******** ************@co mcast.com...

I have an object we'll call it MyObject. MyObject has a property calld
MyBusinessObje cts of type List<IMyBusines sObject2>. IMyBusinessObje ct2 is
a defined interface in my application (See below). I want to bind the
MyBusinessObje cts property to a ComboBox as follows:

ComboBox cbData = new ComboBox();
BindingSource bsSource = new BindingSource() ;

bsSource.DataSo urce = MyObject.MyBusi nessObjects;
cbData.DisplayM emeber = "Text";
cbData.ValueMem ber = "Index";

cbData.DataSour ce = bsSource;
When I run the code I get just the type name (like
'namespace.MyBu sinessObjects') of the object in the drop down or I will
get an error that says that the field "Text" does not exist. However if I
change the object in the collection to use the base interface
(IMyBusinessObj ect) it works fine. How can I bind a control to a business
object that uses an extended interface?
I have run into this problem a long time ago. You will probably have to add
the declarations that you want the databinding to see to the
IMyBusinessObje ct2 interface with the new keyword. Some databinding does
not find the members defined in the inherited interfaces.

SP

Thanks,

Matt

---------------------------------------------------
public interface IMyBusinessObje ct2 : IMyBusinessObje ct
{

}

public interface IMyBusinessObje ct
{
int Index
{
get;
set;
}
string Text
{
get;
set;
}
}

[ME]

Could you give an example of what you mean? I don't follow how the "new"
keyword will assist.

Thanks,

Matt
"SP" <ec***********@ hotmail.com> wrote in message
news:e$******** ******@TK2MSFTN GP05.phx.gbl...

"ME" <tr*********@co mcast.netREMOVE THIS> wrote in message
news:PN******** ************@co mcast.com...

I have an object we'll call it MyObject. MyObject has a property calld
MyBusinessObj ects of type List<IMyBusines sObject2>. IMyBusinessObje ct2 is
a defined interface in my application (See below). I want to bind the
MyBusinessObj ects property to a ComboBox as follows:

ComboBox cbData = new ComboBox();
BindingSource bsSource = new BindingSource() ;

bsSource.DataSo urce = MyObject.MyBusi nessObjects;
cbData.DisplayM emeber = "Text";
cbData.ValueMem ber = "Index";

cbData.DataSour ce = bsSource;
When I run the code I get just the type name (like
'namespace.MyBu sinessObjects') of the object in the drop down or I will
get an error that says that the field "Text" does not exist. However if
I change the object in the collection to use the base interface
(IMyBusinessObj ect) it works fine. How can I bind a control to a
business object that uses an extended interface?

I have run into this problem a long time ago. You will probably have to
add the declarations that you want the databinding to see to the
IMyBusinessObje ct2 interface with the new keyword. Some databinding does
not find the members defined in the inherited interfaces.

SP

Thanks,

Matt

---------------------------------------------------
public interface IMyBusinessObje ct2 : IMyBusinessObje ct
{

}

public interface IMyBusinessObje ct
{
int Index
{
get;
set;
}
string Text
{
get;
set;
}
}

[SP]

"ME" <tr*********@co mcast.netREMOVE THIS> wrote in message
news:mZ******** *************** *******@comcast .com...

Could you give an example of what you mean? I don't follow how the "new"
keyword will assist.
The new keyword just stops you from getting a compilation warning. Any
declarations in your IMyBusinessObje ct interface that you want to bind to
need to be added to your IMyBusinessObje ct2 interface .

SP
Thanks,

Matt
"SP" <ec***********@ hotmail.com> wrote in message
news:e$******** ******@TK2MSFTN GP05.phx.gbl...

"ME" <tr*********@co mcast.netREMOVE THIS> wrote in message
news:PN******** ************@co mcast.com...

I have an object we'll call it MyObject. MyObject has a property calld
MyBusinessOb jects of type List<IMyBusines sObject2>. IMyBusinessObje ct2
is a defined interface in my application (See below). I want to bind the
MyBusinessOb jects property to a ComboBox as follows:

ComboBox cbData = new ComboBox();
BindingSource bsSource = new BindingSource() ;

bsSource.DataSo urce = MyObject.MyBusi nessObjects;
cbData.DisplayM emeber = "Text";
cbData.ValueMem ber = "Index";

cbData.DataSour ce = bsSource;
When I run the code I get just the type name (like
'namespace.MyBu sinessObjects') of the object in the drop down or I will
get an error that says that the field "Text" does not exist. However if
I change the object in the collection to use the base interface
(IMyBusinessObj ect) it works fine. How can I bind a control to a
business object that uses an extended interface?

I have run into this problem a long time ago. You will probably have to
add the declarations that you want the databinding to see to the
IMyBusinessObje ct2 interface with the new keyword. Some databinding does
not find the members defined in the inherited interfaces.

SP

Thanks,

Matt

---------------------------------------------------
public interface IMyBusinessObje ct2 : IMyBusinessObje ct
{

}

public interface IMyBusinessObje ct
{
int Index
{
get;
set;
}
string Text
{
get;
set;
}
}