[英]return Anonymous type from compiled query delegate
我想從編譯的查詢中返回一個匿名類型,它從兩個表中選擇多個列。
我試過用:
public static Func < DBEntities, string>
但無法編譯。 我嘗試創建一個新的數據類型BOMWorkOrder但無法使其工作。 可能是我缺少一些語法。
public static Func<DBEntities, string, IQueryable<BOMWorkOrder>> compiledWorkorderQuery =
CompiledQuery.Compile((DBEntities ctx, string bomNumber) =>
from items in ctx.BM10200
from orders in ctx.BM10300
where orders.Parent_Component_ID == -1 &&
orders.ITEMNMBR == bomNumber &&
orders.TRX_ID == items.TRX_ID
select new
{ bomWorkOrder =
items.TRXDATE,
orders.TRX_ID,
orders.ITEMNMBR,
orders.Assemble_Quantity
});
工作訂單將在哪里:
public class BOMWorkOrder
{
public DateTime TransactionDate { get; set; }
public string TransactionId { get; set; }
public string ItemNumber { get; set; }
public int AssemblyQuantity { get; set; }
}
由於您已創建BOMWorkOrder
類型,因此請使用該類型而不是匿名類型:
... select new BOMWorkOrder
{
TransactionDate = items.TRXDATE,
TransactionId = orders.TRX_ID,
ItemNumber = orders.ITEMNMBR,
AssemblyQuantity = orders.Assemble_Quantity
};
如果返回匿名對象列表,則無法訪問屬性(除非使用dynamic
)
您只是在select
缺少類型名稱:
...
select new BOMWorkOrder
{
TransactionData = items.TRXDATE,
TransactionId = orders.TRX_ID,
ItemNumber = orders.ITEMNBBR,
AssemblyQuantity = orders.Assemble_Queantity,
}
select new bomWorkOrder
{
TransactionDate =items.TRXDATE,
TransactionId =orders.TRX_ID,
ItemNumber =orders.ITEMNMBR,
AssemblyQuantity =orders.Assemble_Quantity
});
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