ADO.NET + C# + LINQ Join two tables using EF and return everything without having to define all fields explicitly.
ado.net c# entity-framework linq
Question
I have a simple LINQ query on ADO.NET Entity Framework as follows
var result =
from itemA in TableA
join itemB in TableB on itemA.ID = itemB.ID
select ??????
I am trying to select everything from itemA and itemB without specifying all the TableA and TableB.
anything thoughts???
Accepted Answer
Is this what you need?
var result = from itemA in TableA
join itemB in TableB on itemA.ID equals itemB.ID
select new { itemA, itemB };
Alternately, you could declare a result class that helps you build the result object without specifying all the fields:
class ItemAB
{
public ItemAB(ItemA a, ItemB b)
{
FieldA1 = a.FieldA1;
FieldA2 = a.FieldA2;
FieldB1 = b.FieldB1;
FieldB2 = b.FieldB2;
}
public int FieldA1 { get; private set; }
public int FieldA2 { get; private set; }
public int FieldB1 { get; private set; }
public int FieldB2 { get; private set; }
}
var result = from itemA in TableA
join itemB in TableB on itemA.ID equals itemB.ID
select new ItemAB(itemA, itemB);
Popular Answer
From your link query it looks like you have 2 tables with a one to one relationship.
If so, the way to do it is to configure your entity model such that two tables are merged into one entity. For details see:
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