entity framework如何进行一对多的联合查询???
RT,高人帮下啊

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帮你顶一下
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entity framework没有用过。。。
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do you mean one-to-many join?

at least you should show whatever you have tried and explain more about what you want
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你能明确的说下你的需求么？

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以下示例针对 SalesOrderHeader 表和 SalesOrderDetail 表执行 GroupJoin 以查找每个客户的订单数。组联接等效于左外部联接，它返回第一个（左侧）数据源的每个元素（即使其他数据源中没有关联元素）。

C# code

using (AdventureWorksEntities AWEntities = new AdventureWorksEntities()){    ObjectQuery<SalesOrderHeader> orders = AWEntities.SalesOrderHeader;    ObjectQuery<SalesOrderDetail> details = AWEntities.SalesOrderDetail;    var query =        from order in orders        join detail in details        on order.SalesOrderID        equals detail.SalesOrderID into orderGroup        select new        {            CustomerID = order.SalesOrderID,            OrderCount = orderGroup.Count()        };    foreach (var order in query)    {        Console.WriteLine("CustomerID: {0}  Orders Count: {1}",            order.CustomerID,            order.OrderCount);    }}