RIA Services 暂时不支持 多对多 关系

RIA Services does not support many to many relationships. You need to supply a third object to act as the linking table between the two tables.

参考:

http://forums.silverlight.net/forums/p/159414/357364.aspx#357364

http://forums.silverlight.net/forums/p/165410/380977.aspx#380977

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