Question

I have the following classes/interfaces. I’m getting an ArgumentException saying “Complex DataBinding accepts as a data source either an IList or an IListSource”. But, I am setting it to an IList. What am I doing wrong?

public interface IOriginList : IList<IOriginEntry>
{
   ...
}

public class OriginList : Interfaces.IOriginList
{
   ...
}

// Binding code
IList<IOriginEntry> originList = new OriginList();
cboOrigin.DataSource = originList;

Answer 1

I don’t believe you can bind to a generic IList<>, only a non-generic IList.

Try this:

cboOrigin.DataSource = originList.ToArray();

* Edit *

Actually, the problem might be that the IList is of an interface type? Nowhere is IOriginEntry set to a concrete object, and you can’t bind the combo box item to an interface.

You could also try this:

public class OriginEntry {
    public string Name {get; set;}
}

public interface IOriginList : IList<OriginEntry> {
    ...
}

public class OriginList : Interfaces.IOriginList {
   ...
}

// Binding code
IList<IOriginEntry> originList = new OriginList();
cboOrigin.DataBindings.Add(new Binding("SelectedValue", originList, "Name"));