退货清单“无法将ObjectResult类型隐式转换为List“ [英] Return List " Cannot implicitly convert type ObjectResult to List "
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问题描述
我正在为我的项目使用N层和实体框架。我一直在使用数据库优先。
我对may项目有问题,我不能返回List<>。以下是我的代码:
public 列表< BuyerMaster> GetDetailBuyerMaster( string idCust)
{
var query = _context.sp_BuyerMaster_GetDetailById(idCust );
return 查询;
}
全部谢谢!
解决方案
< blockquote>在实体框架中使用存储过程时,它返回
ObjectResult< ttype>
,因此您需要将其转换为所需类型。
您可以使用选择运算符如下
return query.Select(x = > new BuyerMaster {
// 在此处指定属性
Id = x.Id
})。ToList()
有一个在这里阅读,有几种方法可以做你想要的:
http://social.msdn.microsoft.com/Forums/en-US/adodotnetentityframework/thread/16e1aa09-3df7-40fa-baaf -b9bcc8c25d17 [<一个href =http://social.msdn.microsoft.com/Forums/en-US/adodotnetentityframework/thread/16e1aa09-3df7-40fa-baaf-b9bcc8c25d17\"target =_ blanktitle =New Window> ^ ]
全部谢谢。我的代码运行正常!
I''m using N-tier and Entity Framework for my project. I have been using Database First.
I have a problem with may project, I can''t return List<>. below is my code :
public List<BuyerMaster> GetDetailBuyerMaster(string idCust)
{
var query = _context.sp_BuyerMaster_GetDetailById(idCust);
return query;
}
Thanks all !
解决方案
When using store procedure in entity framework it returnsObjectResult<ttype>so you need to cast it your required type.
You can cast using Select operator as below
return query.Select(x=> new BuyerMaster{ // Assign properties here Id = x.Id }).ToList()
Have a read here, there are a couple of approaches that might do what you are after:
http://social.msdn.microsoft.com/Forums/en-US/adodotnetentityframework/thread/16e1aa09-3df7-40fa-baaf-b9bcc8c25d17[^]
Thanks all. My code runs Okay !
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