c# - Get a list of elements by their ID in entity framework -

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how can elements in list id? eg; have list roles; i'd roles database in this list id.

i'm using code-first.

i did , threw error:

var roles = db.roles.where(r => user.roles.any(ur => ur.roleid == r.roleid));

roleid of type int.

error:

unable create constant value of type 'samplemvc.domain.role'. primitive types ('such int32, string, , guid') supported in context.

var listofroleid = user.roles.select(r => r.roleid); var roles = db.roles.where(r => listofroleid.contains(r.roleid));

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