如何选择所有字段加上LINQ中的一些新字段？

Question

1. 我得到了RDLC报告
2. 存储在SQL DB中的日期格式是格鲁吉亚语。我想在报告中显示日期为波斯语。
3. 使用Linq我想选择数据库的所有字段，另外还有一些新的字段用作波斯日期字段。

我用下面的语法：

var invoices = from invoice in dbContext.eve_Invoices 
        select new 
        { 

         invoice.CreatorID, 
         invoice.DateChange, 
         invoice.DateCreation, 
         invoice.DatePrint, 
         invoice.Discount, 
         invoice.DiscountPercentage, 
         invoice.DiscountType, 
         invoice.Fare, 
         invoice.ID, 
         invoice.InvoiceStatus, 
         invoice.NumberOfItems, 
         invoice.Packaging, 
         invoice.PrintID, 
         invoice.RawPrice, 
         invoice.RoundOff, 
         invoice.ServiceCharge, 
         invoice.ServingType, 
         invoice.TableID, 
         invoice.Tax, 
         invoice.TotalPrice, 
         invoice.ValidityStatus, 
         PersianYear = invoice.DateCreation != null ? pc.GetYear((DateTime)invoice.DateCreation) : 0, 
         PersianMonth = invoice.DateCreation != null ? pc.GetDayOfMonth((DateTime)invoice.DateCreation) : 0, 
         PersianDay = invoice.DateCreation != null ? pc.GetDayOfMonth((DateTime)invoice.DateCreation) : 0 
        }; 

有任何的方式来传递发票的各个领域，除了新的领域，如：

var invoices = from invoice in dbContext.eve_Invoices 
        select new 
        { 

         invoice.*, 
         PersianYear = invoice.DateCreation != null ? pc.GetYear((DateTime)invoice.DateCreation) : 0, 
         PersianMonth = invoice.DateCreation != null ? pc.GetDayOfMonth((DateTime)invoice.DateCreation) : 0, 
         PersianDay = invoice.DateCreation != null ? pc.GetDayOfMonth((DateTime)invoice.DateCreation) : 0 
        }; 

我也尝试选择新的{发票，....}但是它不会导致数据表与第一个数据表相同。

Answer 1

您可以通过所有的精密组件，但它不是漂亮，最好是通过发票本身，而不是它的领域：

var invoices = from invoice in dbContext.eve_Invoices 
       select new 
       { 
        RelatedInvoice = invoice, 
        PersianYear = invoice.DateCreation != null ? pc.GetYear((DateTime)invoice.DateCreation) : 0, 
        PersianMonth = invoice.DateCreation != null ? pc.GetDayOfMonth((DateTime)invoice.DateCreation) : 0, 
        PersianDay = invoice.DateCreation != null ? pc.GetDayOfMonth((DateTime)invoice.DateCreation) : 0 
       }; 

PS：我不知道这行linq2entities认真工作（它在有些时候我没有任何的IDE，我什么都忘了:)：

PersianDay = invoice.DateCreation != null ? pc.GetDayOfMonth((DateTime)invoice.DateCreation) : 0 

如果这不工作，我建议首先获取数据，然后做转换。

Answer 2

您可以使用发票本身。

var invoices = from invoice in dbContext.eve_Invoices 
       select new 
       { 
       invoice, 
       PersianYear = invoice.DateCreation != null ? >pc.GetYear((DateTime)invoice.DateCreation) : 0, 
       PersianMonth = invoice.DateCreation != null ? >pc.GetDayOfMonth((DateTime)invoice.DateCreation) : 0, 
       PersianDay = invoice.DateCreation != null ? >pc.GetDayOfMonth((DateTime)invoice.DateCreation) : 0 
       }; 

以后可以访问这样

foreach (var invc in invoices) 
    { 
    //invc.invoice.CreatorID 
    } 

日期时间铸造等领域也适用。如果invoice.DateCreation在投射之前为Nullable类型，您应该小心。