I would suggest looking into using a WCF Duplex Service. I found several articles about implementing it searching for "Silverlight WCF Duplex Service." You should also consider bring back chunks of your data instead of the whole set each time if the data set is significantly large as you mentioned.
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我建议考虑使用 WCF 双工服务。我在搜索“Silverlight WCF Duplex Service”时发现了几篇有关实现它的文章。如果数据集像您提到的那样非常大，您还应该考虑每次带回数据块而不是整个数据集。
I would suggest looking into using a WCF Duplex Service. I found several articles about implementing it searching for "Silverlight WCF Duplex Service." You should also consider bring back chunks of your data instead of the whole set each time if the data set is significantly large as you mentioned.