如果实体位于ado.net数据服务中的项列表中，则查询拦截器返回true

I'm using ado.net data services and want to implement row level security in the query interceptor to limit the data to only return data that the user is allowed to see. The complexity comes in in that the user name for the the user is on another table. So I thought I could retrieve a list of events that the user can see according to the entry in the OnlineSubscription table for that user and then return whether the current event matches any entries that are returned as follows:I'm using ado.net data services and want to imp