如何選擇所有字段加上LINQ中的一些新字段？

Question

1. 我得到了RDLC報告
2. 存儲在SQL DB中的日期格式是格魯吉亞語。我想在報告中顯示日期爲波斯語。
3. 使用Linq我想選擇數據庫的所有字段，另外還有一些新的字段用作波斯日期字段。

我用下面的語法：

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 
        }; 

有任何的方式來傳遞發票的各個領域，除了新的領域，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 
        }; 

我也嘗試選擇新的{發票，....}但是它不會導致數據表與第一個數據表相同。

Answer 1

您可以通過所有的精密組件，但它不是漂亮，最好是通過發票本身，而不是它的領域：

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：我不知道這行linq2entities認真工作（它在有些時候我沒有任何的IDE，我什麼都忘了:)：

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

如果這不工作，我建議首先獲取數據，然後做轉換。

Answer 2

您可以使用發票本身。

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 
       }; 

以後可以訪問這樣

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

日期時間鑄造等領域也適用。如果invoice.DateCreation在投射之前爲Nullable類型，您應該小心。