使用LINQ连接两个表

Question

I have two tables:

PlanMaster (PlanName, Product_ID)

and

ProductPoints (Entity_ID, Product_ID, Comm1, Comm2)

Now I am storing Entity_ID into a Session which is stored into an 'int':

int getEntity = Int16.Parse(Session["EntitySelected"].ToString());

I want to show in my LINQ query all of the items from above tables which has

Entity_ID = getEntity

Here is my LINQ query:

var td = from s in cv.Entity_Product_Points join r in dt.PlanMasters on s.Product_ID equals r.Product_ID
         where s.Entity_ID = getEntity
         select s;

Now its giving me an error which says:

Cannot implicitly convert type 'int?' to 'bool'

What is going wrong here? Thank you for your comments in advance!

Answer 1

尝试将其更改为

 where s.Entity_ID == getEntity

Answer 2

var td =
    from s in cv.Entity_Product_Points
    join r in dt.PlanMasters on s.Product_ID equals r.Product_ID
    where s.Entity_ID == getEntity
    select s;

= not equal to ==

Answer 3

where s.Entity_ID = getEntity应该是where s.Entity_ID == getEntity 。

Answer 4

难道不应该是双等于？

Answer 5

var db1 = (from a in AccYearEntity.OBLHManifests select a).ToList();
var db2 = (from a in MasterEntity.UserMasters select a).ToList();

var query = (from a in db1
             join b in db2 on a.EnteredBy equals b.UserId
             where a.LHManifestNum == LHManifestNum
             select new { LHManifestId = a.LHManifestId, LHManifestNum = a.LHManifestNum, LHManifestDate = a.LHManifestDate, StnCode = a.StnCode, Operatr = b.UserName }).FirstOrDefault();

Answer 6

I think this will do,

where s.Entity_ID == getEntity