将控件绑定到嵌套属性

Question

Basic question, which I've exhaustively searched for a full day.

My Account object has a KeyType object, which has a Name property, all generated by Linq to SQL.

My BindingSource:

var result = from account in Schema.Accounts select account as Account;
Data = new ComplexBindingList<Account>(result.ToList<Account>());
DataSource = Data;
ResetBindings(true);

My ComplexBindingList borrowed from a blog by Bradley Smith has this interface:

public class ComplexBindingList<T> : List<T>, ITypedList

This works on my DataGridView:

Columns.Add(CreateColumn("KeyType.Name", "Key Type");

The data's fine, as this code works just before the exception:

var v = account.KeyType.Name;

This doesn't work on my TextBox. I get an exception "Property accessor 'Name' on object 'EPM.BODA.KeyType' threw the following exception:'Object does not match target type.'"

// Controller is my BindingSource
Binding binding = EditField.DataBindings.Add("Text", Controller, "KeyType.Name");

I have a general impression that reflection isn't working properly but can't seem to find the details on how to fill in the gap. Cheers for any help.

Answer 1

This is what I have so far, as a simple workaround.

public virtual Binding GetBinding(string fieldName)
{
    string[] pieces = fieldName.Split('.');
    if ( pieces.GetLength(0) == 1 )
    {
        return new Binding("Text", this, fieldName);
    }
    else
    {
        return new Binding("Text",
            Current.GetType().GetProperty(pieces[0]).GetValue(Current, null), pieces[1]);
    }
}

// Calling the helper function and adding the binding
EditField.DataBindings.Add(Controller.GetBinding(mapping.FieldName));