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.NET Forum / .NET Framework / New Users / July 2006Working with Collections and Datagrids
I have an application that is using Datagrids to display a collection of objects (.Net 1.x, VB.Net environment using Collection Object). The Collection Object, lets say holds a collection of Customer Objects. I want the datagrid to be editable, so that users can enter data through the grid and have it update properties of the specific Customer object. Also I need for when the users clicks the new row in the datagrid that the Collection adds a new Customer object to it. The problem I am having is that when I click the new row in datagrid, I get a system.dll exception. What I see happening is that when new is clicked in the datagrid, the collection class returns a New Object(). Is there an event or property that I need to implement on my Customer Objects so that it will understand the datagrids request for a new object? Do a google search for IEditableObject. http://www.google.com/search?hl=en&q=IEditableObject Its not trivial.... I usually go with a strongly typed dataset for this specific reason. (the work involved with implmenting IEditableObject) > I have an application that is using Datagrids to display a collection of > objects (.Net 1.x, VB.Net environment using Collection Object). The [quoted text clipped - 10 lines] > I need to implement on my Customer Objects so that it will understand the > datagrids request for a new object? I should have be more specific in my description, I have implemented my own Collection class that implements IList, IBindingList, and ICollection interaces. I looked at the IEditableObject interace, but am not seeing how this will correct my problem. It seems that the IEditableObject interface is more responsible for managing changes to an object and either committing or discarding those changes when an edit begins or is cancelled. I will probably need to get to that task next, but for now, I just want return the correct type of object when a "new" is clicked by the user. Does the IEditableObject interface handle new object as well? > Do a google search for > IEditableObject. [quoted text clipped - 21 lines] > > I need to implement on my Customer Objects so that it will understand the > > datagrids request for a new object? I ~think you need a default contructor. And I think items in your Collection, have to implment the IEditable object. Buts its been over a year since I last did it, so I can't be authoratative with these answers. > I should have be more specific in my description, I have implemented my own > Collection class that implements IList, IBindingList, and ICollection [quoted text clipped - 31 lines] > > > I need to implement on my Customer Objects so that it will understand the > > > datagrids request for a new object? Here's an example I found. http://www.vb-helper.com/howto_net_sort_dataset_collection.html I don't know of a C# example offhand. ( I had that one in my old bookmarks) > I ~think you need a default contructor. > And I think items in your Collection, have to implment the IEditable object. [quoted text clipped - 48 lines] > the > > > > datagrids request for a new object? Thanks for the information. I will see what I can work out. > Here's an example I found. > [quoted text clipped - 65 lines] > > the > > > > > datagrids request for a new object? It would be nice if I could get someone from Microsoft to help out with this question. The only way I have been able to figure out how to make this work, is to create a strongly typed collection > Thanks for the information. I will see what I can work out. > [quoted text clipped - 67 lines] > > > the > > > > > > datagrids request for a new object? Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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