尝试编辑DataGrid单元格时发生InvalidOperationException

Question

My purpose is to be able to bind to WPF controls classes that are obtained from some notification mechanism.

I have defined an MyList class that holds MyItem objects. These MyItem objects have runtime defined properties. So, MyItem implements ICustomTypeDescriptor. I want the controls to be notified when values change, so it also implements INotifyPropertyChanged. And because I had problem with edition, I also made it implement IEditableObject.

So, I have the MyItem class defined as:

public class MyItem: BaseClass, INotifyPropertyChanged, ICustomTypeDescriptor, IEditable {
//...
}

where BaseClass is my original class I want to make visible to WPF controls.

MyList, on its side, implements IEnumerable as this is what is expected for DataGrid.ItemsSource, INotifyCollectionChanged because I want the control to be notified for new rows, IEditableCollectionView and IList to try to solve my edition problem.

So, I have the following class definition:

public class MyList : BaseClass, INotifyCollectionChanged, IEnumerable<MyItem>,
                      IEditableCollectionView, IList<MyItem>
{
  private List<MyItem> _list = new List<MyItem(); // holds items
//...
}

When I set this list as items source to a data grid, everything seems to work fine: The column of the data grid are the declared dynamic properties through the ICustomTypeDescriptor interface. The value of each cell is correctly displayed.

But I soon as I double click on a cell for editing it, I get an InvalidOperationException without any stack trace or more explicit message.

I have no idea on what I should do to make it work. I have tried all the possible solutions I have found here or elsewhere on the web.

Has anyone an idea on what is going wrong?

Answer 1

尝试在MyList类中实现非通用IList接口，并确保您没有将任何项目直接添加到DataGrid控件的Items集合中： https : //social.msdn.microsoft.com/Forums/en -US / 9deaa308-37e8-4110-814f-30d2de7c2654 /数据网格-edititem-IS-不被允许换这个视图？论坛= WPF