c# - Linq Error on Left outer join -

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i have alert table has 1:many mapping devices. relationship conveyed ina mapping table. when try produce left outer join mapping table various asset type tables following error:system.security.verificationexception: operation destabilize runtime.

 var alertassets = (from in dc.msalert_assets                               b in dc.msrfids.where(x => x.accountid == a.accountid && x.rfid == a.tagnum && x.custnum == a.custnum).defaultifempty()                               c in dc.msdevices.where(x => x.accountid == a.accountid && x.deviceid == a.deviceid).defaultifempty()                               d in dc.msgroups.where(x => x.accountid == a.accountid && x.groupid == a.groupid).defaultifempty()                               let x = grrepo.getassetsforgroupid(d.groupid, d.accountid)                               a.alertid == alertid                               select new {... specific objects}

i thought may narrowing issue, enumarated iqueryable, still same issue.

the 1 thing jumps out @ me line

let x = grrepo.getassetsforgroupid(d.groupid, d.accountid)

if d can null (since it's left outer join because of defaultifempty), how can access d.groupid or d.accountid. think failing since cannot properties/variables null.


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