linq left join method syntax

// Option 1: Expecting either 0 or 1 matches from the "Right" // table (Bars in this case): var qry = Foos.GroupJoin( Bars, foo => foo.Foo_Id, bar => bar.Foo_Id, (f,bs) => new { Foo = f, Bar = bs.SingleOrDefault() }); // Option 2: Expecting either 0 or more matches from the "Right" table // (courtesy of currently selected answer): var qry = Foos.GroupJoin( Bars, foo => foo.Foo_Id, bar => bar.Foo_Id, (f,bs) => new { Foo = f, Bars = bs }) .SelectMany( fooBars => fooBars.Bars.DefaultIfEmpty(), (x,y) => new { Foo = x.Foo, Bar = y });

var query = from person in people join pet in pets on person equals pet.Owner into gj from subpet in gj.DefaultIfEmpty() select new { person.FirstName, PetName = subpet?.Name ?? String.Empty };

right outer join in linq sql

using (JoinEntities Context = new JoinEntities())  
{  
    var rightOuterJoin = from d in Context.DepartmentMasters  
    join e in Context.EmployeeMasters on d.DepartmentId equals e.DepartmentId into emp  
    from employee in emp.DefaultIfEmpty()  
    select new  
    {  
        EmployeeCode = employee.Code,  
        EmployeeName = employee.Name,  
        DepartmentName = d.Name  
    };  
    Console.WriteLine("Employee CodetEmployee NametDepartment Name");  
    foreach (var data in rightOuterJoin)  
    {  
        Console.WriteLine(data.EmployeeCode + "tt" + data.EmployeeName + "t" + data.DepartmentName);  
    }  
}

Posted by: Guest on September-07-2021

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