Question

invoiceData = from x in context.PdtDeliveryTables 
    join pt in context.DiagramNoTables on x.DiagramID equals pt.DiagramID
    join mt in context.MaterialTables on pt.MaterialID equals mt.MaterialID into t from ct in t.DefaultIfEmpty()
    join odr in context.OrderTables on x.OrderID equals odr.OrderID into sr
    from d in sr.DefaultIfEmpty()
    where (pt.CustomerID == customerID) && (x.DeliveryDate >= (startDate ?? DateTime.MinValue) && x.DeliveryDate <= (endDate ?? DateTime.MaxValue))
    orderby x.DeliveryDate  ascending
    select new InvoiceTable
        {    
        };

我需要在OR条件下替换这个左连接条件：

join odr in context.OrderTables on x.OrderID equals odr.OrderID into sr
from d in sr.DefaultIfEmpty()

喜欢：

join odr in context.OrderTables on x.OrderID equals 
    x => x.OrderID !=0 
        ? x.OrderNo
        : x.DeliveryNo 
into sr from d in sr.DefaultIfEmpty()

下面是更改的查询，但我仍然获得超时异常

超时已过期。操作完成之前经过的超时时间或服务器没有响应。

            invoiceData = from x in context.PdtDeliveryTables
                         join pt in context.DiagramNoTables on x.DiagramID equals pt.DiagramID
                         join mt in context.MaterialTables on pt.MaterialID equals mt.MaterialID into t from ct in t.DefaultIfEmpty()
                         from d in context.OrderTables.DefaultIfEmpty()
                         where (x.OrderID != 0 && x.OrderID == d.OrderID) || (x.OrderID == 0 && x.DeliveryNo == d.OrderNo)
                         where (pt.CustomerID == customerID) && (x.DeliveryDate >= (startDate ?? DateTime.MinValue) && x.DeliveryDate <= (endDate ?? DateTime.MaxValue))
                         orderby x.DeliveryDate  ascending
           select new InvoiceTable
           {
                OrderID = x.OrderID,
                OrderNo = x.OrderID != 0 ? d.OrderNo : x.DeliveryNo,
                DiagramNo = pt.DiagramNo,
                ProductName = pt.ProductName,
                MaterialName = ct.MaterialName,
                Quantity = x.DeliveryQty,
                OrderDate = x.DeliveryDate,
                InvoiceDate = d.InvoiceDate,
                UnitPrice = d.UnitPrice != null ? d.UnitPrice : pt.SellingPrice,
                Amount = d.UnitPrice != null ? d.UnitPrice * x.DeliveryQty : pt.SellingPrice * x.DeliveryQty,
                Printable = true
            };                       
        }

Answer 1

我删除了x（PdtDeliveryTables）和odr（OrderTables）之间的连接语法，并将其更改为表达式：

invoiceData = 
    from x in context.PdtDeliveryTables 
    from odr in context.OrderTables.DefaultIfEmpty() 
    where (odr.OrderID != 0 && x.OrderID == x.OrderNo) 
          || x.OrderID == x.DeliveryNo)
    join pt in context.DiagramNoTables on x.DiagramID equals pt.DiagramID
    join mt in context.MaterialTables on pt.MaterialID equals mt.MaterialID 
    into t 
    from ct in t.DefaultIfEmpty()
    where (pt.CustomerID == customerID) 
           && (x.DeliveryDate >= (startDate ?? DateTime.MinValue) 
               && x.DeliveryDate <= (endDate ?? DateTime.MaxValue))
    orderby x.DeliveryDate  ascending
    select new InvoiceTable
        {    
        };

如何在两个字段中使用左连接或条件？

1 个答案: