IFilterProvider Interface example error

Question

I have deployed the code in http://msdn.microsoft.com/en-us/library/microsoft.sharepoint.webpartpages.communication.ifilterprovider.aspx. When I connect this webpart to a list webpart, for some reason in the next function, connectedPart is null. Why this is happening?

        public override void PartCommunicationConnect(
            string interfaceName,
            WebPart connectedPart,
            string connectedInterfaceName,
            ConnectionRunAt runAt)
        {
            // Keep track of whether the Web Part is connected.
            if (interfaceName == "MyFilterProviderInterface")
            {
                _connected = true;
               _connectedWebPartTitle = SPEncode.HtmlEncode(connectedPart.Title);
            }
        }

And if IFilterProvider Interface is obsolete which one should I use? Is there some example like this one?

Answer 1

If the Web Part that is being connected to is on another page, connectedPart is null.

You can use IWebPartParameters Interface and it is clearly mentioned on IFilterProvider Interface

[ObsoleteAttribute("Use System.Web.UI.WebControls.WebParts.IWebPartParameters instead")] public interface IFilterProvider

Here is a sample which using IWebPartParameters Interface to build a consumer web part.