Question

我正在尝试使用LINQ将product_name与product_prize_kg连接起来，以便我可以将其显示为下拉列表中的一个字段。当我尝试这样做时，我收到以下错误。

类型'system.collections.generic.list（匿名类型）'的值无法转换为...

我的代码是这样的：

Public Function selectAll() As List(Of tblProduct)
    Dim result = From product In dc.tblProducts
                 Select New With
                 {
                    Key .productID = product.pk_product_id,
                    Key .productNameKg = Convert.ToString(product.product_name) & " " & Convert.ToString(product.product_price_kg)
                 }

    Return result.ToList()
End Function

这是我要填写的下拉列表。

    <asp:DropDownList ID="DropDownList1" runat="server" 
        DataSourceID="ObjectDataSource1" DataTextField="productNameKg" 
        DataValueField="productID">
    </asp:DropDownList>

由于

Grtz Simke

Answer 1

Public Function selectAll() As List(Of Product)
    Dim result = From product In tblProducts
                 Select New Product With
             {
                .ProductId = product.pk_product_id,
                .ProductNameKg = Convert.ToString(product.product_name) & " " & Convert.ToString(product.product_price_kg)
             }


    Return result.ToList()
End Function



Public Class Product

    Property ProductId As String

    Property ProductNameKg As String

End Class

LINQ如何连接2个db列以显示在下拉列表中

1 个答案: