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var students = new[] {
new {id=1,name="张三"},
new {id=2,name="李四"},
};
var scores = new[] {
new{id=2,mark=79}
};
var result = from student in students
join score in scores on student.id equals score.id
into stuscores
from stuscore in stuscores.DefaultIfEmpty()
select new { student.name, mark = (stuscore == null ? null : (int?)stuscore.mark) };
foreach (var r in result)
{
Console.WriteLine("姓名:"+r.name+",成绩:"+r.mark);
}