如何在 linq 查询中设置内连接

Question

我想在 linq 查询中设置内连接

这是我的代码，

var JoinUsingMS = from emp in _productRepository.Table
   join address in _purchaseReminderRepository.Table
  on new { c1 = emp.VendorId, c2 = emp.Name } equals new { c1 = address.VendorId, c2 = address.Product } into bp_sm
   from c in bp_sm.DefaultIfEmpty()
   where emp.Published == true
   select emp;

从这个查询中，我得到了左连接（通过调试跟踪） 。 虽然我认为这个查询非常适合内部连接（参考链接As Per This Solution ）仍然 output 获得左连接

Answer 1

下面更新了内部连接的查询：

var JoinUsingMS = from emp in _productRepository.Table
   join address in _purchaseReminderRepository.Table
   on new { c1 = emp.VendorId, c2 = emp.Name } 
   equals new { c1 = address.VendorId, c2 = address.Product }
   where emp.Published == true
   select emp;

Answer 2

简单的。 删除DefaultIfEmpty行。 这就是创建左连接子句的原因：

var JoinUsingMS = 
    from emp in _productRepository.Table
    join address in _purchaseReminderRepository.Table
      on new { c1 = emp.VendorId, c2 = emp.Name } equals new { c1 = address.VendorId, c2 = address.Product } // into bp_sm
    // from c in bp_sm.DefaultIfEmpty()
    where emp.Published == true
    select emp;