public override void Dispose()
{
_closure?.Unsubscribe(true, _isOneTime);
_bindingSource.Dispose();
ValueChanging = null;
ValueChanged = null;
_closure = null;
base.Dispose();
}
/// <summary>
/// Sets the source value.
/// </summary>
/// <param name="targetAccessor">The specified accessor to get value.</param>
/// <param name="context">The specified operation context.</param>
/// <param name="throwOnError">
/// true to throw an exception if the value cannot be set.
/// </param>
protected override bool SetValueInternal(IBindingSourceAccessor targetAccessor, IDataContext context,
bool throwOnError)
{
IBindingPathMembers members = _bindingSource.GetPathMembers(throwOnError);
if (!members.AllMembersAvailable)
{
return(false);
}
object penultimateValue = members.PenultimateValue;
IBindingMemberInfo lastMember = members.LastMember;
object oldValue;
object newValue = targetAccessor.GetValue(lastMember, context, throwOnError);
if (lastMember.CanRead)
{
oldValue = lastMember.GetValue(penultimateValue, null);
if (ReferenceEquals(oldValue, newValue) || newValue.IsUnsetValueOrDoNothing())
{
return(false);
}
}
else
{
oldValue = BindingConstants.UnsetValue;
if (newValue.IsUnsetValueOrDoNothing())
{
return(false);
}
}
ValueAccessorChangingEventArgs args = null;
if (ValueChanging != null)
{
args = RaiseValueChanging(context, penultimateValue, lastMember, oldValue, newValue);
if (args != null)
{
if (args.Cancel)
{
return(false);
}
if (!ReferenceEquals(newValue, args.NewValue))
{
newValue = args.NewValue;
if (newValue.IsUnsetValueOrDoNothing())
{
return(false);
}
}
}
}
if (AutoConvertValue)
{
newValue = BindingServiceProvider.ValueConverter(lastMember.Type, newValue);
}
if (Equals(oldValue, newValue))
{
return(false);
}
if (lastMember.MemberType == BindingMemberType.Event)
{
TryRegisterEvent((BindingMemberValue)oldValue, newValue, context);
RaiseValueChanged(context, penultimateValue, lastMember, oldValue, newValue, args);
}
else
{
if (_closure != null)
{
_closure.Unsubscribe();
}
lastMember.SetValue(penultimateValue, new[] { newValue });
if (ValueChanged != null)
{
RaiseValueChanged(context, penultimateValue, lastMember, oldValue, newValue, args);
}
}
return(true);
}