HRESULT IPropertyNotifySink.OnChanged(DispatchID dispid)
{
// Some controls fire OnChanged() notifications when getting values of some properties.
// To prevent this kind of recursion, we check to see if we are already inside a OnChanged() call.
if (host.NoComponentChangeEvents != 0)
{
return(HRESULT.S_OK);
}
host.NoComponentChangeEvents++;
try
{
AxPropertyDescriptor prop = null;
Debug.WriteLineIf(AxHTraceSwitch.TraceVerbose, "in OnChanged");
if (dispid != DispatchID.UNKNOWN)
{
prop = host.GetPropertyDescriptorFromDispid(dispid);
if (prop != null)
{
prop.OnValueChanged(host);
if (!prop.SettingValue)
{
prop.UpdateTypeConverterAndTypeEditor(true);
}
}
}
else
{
// update them all for DISPID_UNKNOWN.
PropertyDescriptorCollection props = ((ICustomTypeDescriptor)host).GetProperties();
foreach (PropertyDescriptor p in props)
{
prop = p as AxPropertyDescriptor;
if (prop != null && !prop.SettingValue)
{
prop.UpdateTypeConverterAndTypeEditor(true);
}
}
}
ISite site = host.Site;
if (site != null)
{
IComponentChangeService changeService = (IComponentChangeService)site.GetService(typeof(IComponentChangeService));
if (changeService != null)
{
try
{
changeService.OnComponentChanging(host, prop);
}
catch (CheckoutException coEx)
{
if (coEx == CheckoutException.Canceled)
{
return(HRESULT.S_OK);
}
throw;
}
// Now notify the change service that the change was successful.
//
changeService.OnComponentChanged(host, prop, null, (prop?.GetValue(host)));
}
}
}
catch (Exception t)
{
Debug.Fail(t.ToString());
throw;
}
finally
{
host.NoComponentChangeEvents--;
}
return(HRESULT.S_OK);
}
