如何在 linq 查詢中設置內連接

Question

我想在 linq 查詢中設置內連接

這是我的代碼，

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;

從這個查詢中，我得到了左連接（通過調試跟蹤） 。 雖然我認為這個查詢非常適合內部連接（參考鏈接As Per This Solution ）仍然 output 獲得左連接

Answer 1

下面更新了內部連接的查詢：

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

簡單的。 刪除DefaultIfEmpty行。 這就是創建左連接子句的原因：

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;