“LINQ对实体不支持LINQ表达式节点类型‘Invoke’”——难倒了!

In my EF later, I'm trying to pass in an anonymous function to be used as part of my Linq query. The function would pass in an INT and return a BOOL (u.RelationTypeId is an INT). Below is a simplified version of my function:In my EF later, I'm trying to pass in an anonym