MVC3 C# Linq (Where / if)

Question

I am trying to insert if statement within Where in a model,

q = from vw_masterview in ctx.vw_MasterViews
where 
vw_masterview.LastDate <= toDate &&
vw_masterview.OfficeId == MemberRepository.AllowedOfficeId

AllowedOfficeId could be null, I would like to add if statment

q = from vw_masterview in ctx.vw_MasterViews
    where 
    vw_masterview.LastDate <= toDate &&
    ***if (MemberRepository.AllowedOfficeId != null)***
    vw_masterview.OfficeId == MemberRepository.AllowedOfficeId

Thanks in advance.

Answer 1

You can rewrite your query using the fluent notation and apply an additional Where statement when AllowedOfficeId isn't null:

var query = ctx.vw_MasterViews.Where(v => v.LastDate <= toDate);
if (MemberRepository.AllowedOfficeId != null)
{
    query = query.Where(v => v.OfficeId == MemberRepository.AllowedOfficeId);
}

Then you can either run the query or continue to build it up, such as using the Select method to retrieve specific properties or project into an anonymous type or new class.

Answer 2

q = from vw_masterview in ctx.vw_MasterViews
    where
        vw_masterview.LastDate <= toDate &&
        (
            (MemberRepository.AllowedOfficeId != null) &&
            (vw_masterview.OfficeId == MemberRepository.AllowedOfficeId)
        )