Looping through IObjectList

Looping through IObjectList - Error

CapableObjects Forums

Home

Members

Calendar

Who's On

Welcome Guest ( Login | Register )

Looping through IObjectList - Error

Rate Topic

Display Mode

Topic Options

Author

Message

venks

Posted 2009-12-03 17:09:18

Forum Guru

Group: Forum Members
Last Login: 2010-05-16 05:14:12
Posts: 63, Visits: 355

I am getting an error while trying to loop through an IObjectList

********************

oResultList := myps.Evaluate( 'Person.allinstances') as IObjectList;

for each oObj:IObject in oResultList do

begin

//other code

oPerson :=oObj.AsIObject as person;//error on this line

//other code

end;

*******************************

What does this error mean ?

***************************************

System.InvalidCastException was unhandled by user code
Message="Unable to cast object of type 'Eco.Framework.Impl.Frontside.DefaultFrontsideLocator' to type 'Package_1.Person'."
Source="Eco54Nuts"
StackTrace:
       at Eco54Nuts.FormMain.btnSendMail_Click(Object sender, EventArgs e) in E:\54Nuts\Copy (2) of Copy of Eco54Nuts Rank subgroup\Eco54Nuts\MainForm.pas:line 156
       at System.Windows.Forms.Control.OnClick(EventArgs e)
       at System.Windows.Forms.Button.OnClick(EventArgs e)
       at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
       at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
       at System.Windows.Forms.Control.WndProc(Message& m)
       at System.Windows.Forms.ButtonBase.WndProc(Message& m)
       at System.Windows.Forms.Button.WndProc(Message& m)
       at System.Windows.Forms.Control.ControlNativewindow.OnMessage(Message& m)
       at System.Windows.Forms.Control.ControlNativewindow.WndProc(Message& m)
       at System.Windows.Forms.Nativewindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
InnerException:

Post #4604

brian

Posted 2009-12-04 04:07:45

Supreme Being

Group: Forum Members
Last Login: 2011-11-18 23:48:32
Posts: 139, Visits: 410

Here is how I use IObjectList for collections in C#:

IObjectList oclResult = ecoSpace.GetEcoService<IOclPsService>().Execute(null, null, "Person.AllInstances", -1, 0);
Person persons = oclResult.GetAsIList<Person>();
foreach ( var person in Persons ) {
// access person for your logic
}

I'll take a stab at what the Delphi syntax would be, but I'll probably be off a little.

oResultList := myps.Evaluate( 'Person.allinstances') as IObjectList;
persons := oResultList.GetAsIList<Person>();
for each person: Person in oResultList do begin
// access person for your logic
end;

I'm not sure how Delphi uses generic methods, so the syntax is probably wrong.

Also, if your result is not a collection you can use IObjectList.AsObject to return an instance of the object returned from the ocl expression. You will need to cast it to the proper type. This works for value types as well (i.e. int/integer, bool/booloean).

Brian

Post #4605