'Into'在LINQ查询中的作用 [英] Role of 'Into' in a LINQ query

问题描述

嗨..

在以下查询中插入"的功能是什么?

Hi..

What does function of ''into'' in following query?

var query = 
from u in dc.UserDetails  join s in dc.SchoolDetails
                on u.SchoolId equals s.SchoolId <big>into </big>JoinedUserSchool
                            from s in JoinedUserSchool.DefaultIfEmpty()
                            select new
                                {
                           UserName = u.FirstName,
                           SchoolName = s != null ? s.Name : null
                                };

推荐答案

请参见
http://msdn.microsoft.com/en-us/library/bb311045.aspx [ ^ ]


进入创建上下文引用对象.在这里，UserDetails和SchoolDetails都合并到对象JoinedUserSchool中，该对象具有以下条件:u.SchoolId等于s.ShoolId

:rose:

See
http://msdn.microsoft.com/en-us/library/bb311045.aspx[^]


Into creates a contextual reference object. Here the UserDetails and SchoolDetails both merges into the object JoinedUserSchool which holds the criteria u.SchoolId equals s.ShoolId

:rose:

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