C# LINQ Join两个表连接，关联多个条件的写法

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1、sql语句：

select * from Users u join Teachers t 
on u.UserID==t.TeacherID and u.Name=t.Name

2、linq写法：

1）、方法一：

var userInfos = from u in db.Users join t in db.Teachers 
				on new {
      u.UserID , u.Name } equals new {
       UserID = t.TeacherID,t.Name }
				select new {
      ID=u.UserID, t.Name };

2）、方法二：

var userInfos = from u in db.Users
                from t in db.Teachers
                where u.UserID == t.TeacherID && u.Name == t.Name
                select new {
      ID=u.UserID, t.Name };

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