asp.net mvc 4 linq扩展方法语法连接

Question

 var model = _db.Seuni
                .Join(from o in _db.Keuni
                      join
                      c in _db.Seuni 
                      on o.klasaid equals c.klasaid
                          select new {o.emriklases,c.emristudent,c.studentid,c.nota })
                       .OrderByDescending(r => r.nota)

我有这个代码示例，我已经搜索过找到这个linq扩展方法的正确语法，而且我还没有给我一个正确的语法？提前谢谢你

Answer 1

您的查询和方法语法混合错误。

 var model = _db.Seuni
            .Join(_db.Keuni,
                  c => c.klasaid,
                  o => o.klasaid,
                  (c, o) => new { o.emriklases, c.emristudent, c.studentid, c.nota })
            .OrderByDescending(r => r.nota);

或者使用查询（订购方法）语法

// query syntax
var model = (from o in _db.Keuni
            join c in _db.Seuni on o.klasaid equals c.klasaid
            select new { o.emriklases, c.emristudent, c.studentid, c.nota })
            .OrderByDescending(r => r.nota);