C# 如何选择联接中的所有字段，以便以后与其他查询一起使用？

这是我的加入：

var jCorsi = from t in db.Table1
             join j in db.Table2 on t.IDCourse equals j.IDCourse
             select new { t, j };

我需要（稍后使用其他查询）能够使用这两个表的字段。 例如：

但是它说“没有找到

j.IDCourse

”的定义，即使我选择了t和j

我哪里错了？

你应该这样做

var testx = (from j in jCorsi
             group j by j.t.IDCourse  into g
             select ...

（

j.t.

代替

j.

）

也许更明确一点更好：

var jCorsi = from t in db.Table1
             join j in db.Table2 on t.IDCourse equals j.IDCourse
             select new { Table1 = t, Table2 = j };

var testx = (from x in jCorsi
             group x by x.Table1.IDCourse  into g
             select ...

var jCorsi = from t in db.Table1
             join j in db.Table2 on t.IDCourse equals j.IDCourse
             select new { Table1 = t, Table2 = j };

var testx = (from x in jCorsi
             group x by x.Table1.IDCourse  into g
             select ...

    var jCorsi = from t in table1
                 join j in table2 on t.IDCourse equals j.IDCourse
                 select new { t, j };

    var testx = from j in jCorsi
                group j by j.t.IDCourse into g
                select g;