关于 Northwind DB 示例的问题
当弄乱 Subsonic 3.0 Northwind 的东西时：
var product = Product.SingleOrDefault(x => x.ProductID == 1);
我发现使用智能感知可以实现以下功能，但不可行：
var product = Product.SingleOrDefault(x => x.OrderDetails == 1);
OrderDetails 作为 Product 的成员，是一个 IQueryable。我想我是 LINQ 的新手，但我想知道如何使用这个成员？每次我尝试从中获取信息时都会收到错误。有人可以给我一个如何使用 Product 的 OrderDetails 成员的示例吗？也许将数据绑定中的结果扔到 Gridview 中？
查看以下代码并告诉我我做错了什么：
var products = from od in OrderDetail.All()
join p in Product.All() on od.ProductID equals p.ProductID
select od;
我收到以下错误：
Object of type 'System.Single' cannot be converted to type 'System.Decimal'.
When messing with the Subsonic 3.0 Northwind stuff:
var product = Product.SingleOrDefault(x => x.ProductID == 1);
I found the following was possible, but not workable) using intellisense:
var product = Product.SingleOrDefault(x => x.OrderDetails == 1);
OrderDetails as a member of Product, is an IQueryable. I guess I'm new to LINQ, but I was wondering how to use this member? Everytime I try to get info out of this I get an error. Could someone give me an example of how to use the OrderDetails member of Product? And perhaps throw the results in a databind to a Gridview?
Look at the following code and tell me what I'm doing wrong:
var products = from od in OrderDetail.All()
join p in Product.All() on od.ProductID equals p.ProductID
select od;
I get the following error:
Object of type 'System.Single' cannot be converted to type 'System.Decimal'.
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SubSonic 公开的 IQueriable 成员是您的外键。您可以按以下方式使用它们。
The IQueriable members that are exposed by SubSonic are your Foreign Keys. You could use them in the following manner.