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orcities View Drop Down
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Posts: 454 		Post Options Post Options   Quote orcities Quote  Post ReplyReply Direct Link To This Post Topic: First Silverlight Use
    Posted: 11-May-2011 at 8:53am
I have developed many WPF and Windows apps. This is my first time really using Ideablade with SL.
 
I have run an async query to recieve and entity. Some of the attached entities return detached or null. Do I have to do an Include with all of my async queries?
So basically lazy loading doesn't seem to work. Should it?


Edited by orcities - 11-May-2011 at 9:02am
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smi-mark View Drop Down
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Posts: 343 		Post Options Post Options   Quote smi-mark Quote  Post ReplyReply Direct Link To This Post Posted: 11-May-2011 at 9:34am
I usually use an Include but I believe it should IsNullOrPendingEntity and an event PendingEntityResolved should fire when it's lazy loaded.
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orcities View Drop Down
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Posts: 454 		Post Options Post Options   Quote orcities Quote  Post ReplyReply Direct Link To This Post Posted: 11-May-2011 at 9:48am
I guess that makes since. I am just used to it lazy loading. So in order to do lazy loading i have to fire the event to raise the changes?
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smi-mark View Drop Down
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Posts: 343 		Post Options Post Options   Quote smi-mark Quote  Post ReplyReply Direct Link To This Post Posted: 11-May-2011 at 9:50am
If you are databinding to the list then it should just fill in when it loads. Using an include would be the recommended approach though.
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IdeaBlade
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Posts: 1391 		Post Options Post Options   Quote kimj Quote  Post ReplyReply Direct Link To This Post Posted: 12-May-2011 at 10:42am
I just wanted to expand on what smi-mark said since this is a confusing topic and often causes problems for people new to Silverlight. 
Lazy loading occurs by default in both Silverlight and non-Silverlight DevForce applications, but in Silverlight that load has to be asynchronous because the data has to be fetched from the server.  You don't need to fire any events, and you don't need to listen for the Pending* events unless you want to.
 
Using "Include" means you're doing "eager" loading, and can often be useful when you need an object graph. 
 
The Tour of DevForce Silverlight has a nice example of lazy vs. eager loading and may be worth a look.  You can find it here (and I highly recommend the entire video series) - http://drc.ideablade.com/xwiki/bin/view/Documentation/tour-devforce-silverlight
 
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