/// <summary>
/// Actually performs binding the targetlist to the ListControl.
/// </summary>
protected override void DoBindTargetToSource(object source, object target, IDictionary <string, object> variables)
{
// retrieve targetlist
IList targetList = this.GetTargetValue(target, variables) as IList;
if (targetList == null)
{
throw new ArgumentException("Target property has to be initialized to an instance of IList interface.");
}
// retrieve ListControl to be bound
source = this.GetSourceValue(source, variables);
ListControl listControl = source as ListControl;
if (listControl == null)
{
throw new ArgumentException(string.Format("Source property has to be initialized to an instance of {0}.", typeof(ListControl).FullName));
}
// clear control's selection
listControl.ClearSelection();
ListItemCollection listItems = listControl.Items;
// set binding context if applicable
IBindingAwareFormatter bindingAwareFormatter = this.Formatter as IBindingAwareFormatter;
if (bindingAwareFormatter != null)
{
bindingAwareFormatter.SetBindingContext(source, target, variables, BindingDirection.TargetToSource);
}
// select all items in ListControl matching keys in targetlist
try
{
IFormatter formatter = this.Formatter;
foreach (object objectItem in targetList)
{
string key = formatter.Format(objectItem);
ListItem item = listItems.FindByValue(key);
if (item != null)
{
item.Selected = true;
}
else
{
throw new ArgumentOutOfRangeException("value", key, string.Format("Value '{0}' does not exist", key));
}
}
}
finally
{
if (bindingAwareFormatter != null)
{
bindingAwareFormatter.ClearBindingContext();
}
}
}
/// <summary>
/// Actually performs unbinding the ListControl's selected values into the target's <see cref="IList"/>
/// </summary>
protected override void DoBindSourceToTarget(object source, object target, IDictionary <string, object> variables)
{
// retrieve targetlist
IList targetList = this.GetTargetValue(target, variables) as IList;
if (targetList == null)
{
throw new ArgumentException(string.Format("Target property must evaluate to an instance of {0}.", typeof(IList).FullName));
}
// retrieve ListControl to be unbound
source = this.GetSourceValue(source, variables);
ListControl listControl = source as ListControl;
if (listControl == null)
{
throw new ArgumentException(string.Format("Source property must evaluate to an instance of {0}.", typeof(ListControl).FullName));
}
// reset target list
targetList.Clear();
// set binding context if applicable
IBindingAwareFormatter bindingAwareFormatter = this.Formatter as IBindingAwareFormatter;
if (bindingAwareFormatter != null)
{
bindingAwareFormatter.SetBindingContext(source, target, variables, BindingDirection.SourceToTarget);
}
// (re-)add selected items to the target list
try
{
IFormatter formatter = this.Formatter;
ListItemCollection listItems = listControl.Items;
foreach (ListItem listItem in listControl.Items)
{
if (listItem.Selected)
{
// formatter must return an object applicable to the targetlist.
object item = formatter.Parse(listItem.Value);
targetList.Add(item);
}
}
}
finally
{
if (bindingAwareFormatter != null)
{
bindingAwareFormatter.ClearBindingContext();
}
}
}