GET 调用：已添加具有相同键的项目。关键：身份证

Question

我正在尝试使用 EF Core 调用 SQL 服务器数据库中的存储过程。数据库服务器使用 Docker 托管。问题是当我对控制器进行 GET 调用以访问服务时，它会停顿一会儿然后出现此错误...

ArgumentException: An item with the same key has already been added. Key: Id

这是我的代码：

型号

public interface IGiftList
{
   int Id { get; set; }
   string Occasion { get; set; }
   int UserId { get; set; }
   string Alias { get; set; }
   bool AnotherRecipient { get; set; }
   string RecipientName { get; set; }
   int RecipientAddressId { get; set; }
}

public class GiftList : IGiftList
{
   public int Id { get; set; }
   public string Occasion { get; set; }
   public int UserId { get; set; }
   public string Alias { get; set; }
   public bool AnotherRecipient { get; set; }
   public string RecipientName { get; set; }
   public int RecipientAddressId { get; set; }
   public List<Gift> Items { get; set;}
}

控制器

[HttpGet, Route("lists")]
public List<GiftList> GetUserLists([FromQuery] int userId)
{
   var lists = _giftService.GetUserLists(userId).Select(l => (GiftList)l).ToList();
   return lists;
}

服务

public List<IGiftList> GetUserLists(int userId)
{
   var items = this.giftContext.Lists.FromSqlRaw($"EXECUTE dbo.GetUserLists @UserId={userId}").ToList<IGiftList>(); <--Exception gets raised here.
   return items;
}

存储过程

CREATE PROCEDURE dbo.GetUserLists 
(
    @UserId INT
)
AS
DECLARE @ListId INT

SET @ListId = (SELECT TOP (1) Id FROM Lists WHERE UserId = @UserId);

SELECT 
    L.Id,
    O.Title,
    U.Id,
    L.Alias,
    L.AnotherRecipient,
    L.RecipientName,
    L.RecipientAddressId
FROM Lists AS L
JOIN Occasions AS O
    ON O.Id = L.OccasionId
JOIN Users AS U
    ON U.Id = L.UserId
WHERE
    L.UserId = @UserId

知道我为什么会收到此错误吗？

Answer 1

这是因为你的 Store Procedure's 两个字段 L.Id 和 U.Id 被视为 Id 但是当涉及到与你的模型绑定时属性是 Id 和 UserId 编译器在用两个映射时遇到问题。所以最好的方法是使用 SQL Alias AS.

来处理这个问题

U.Id AS UserId 会解决您的问题。

Note: If the primary keys in the select query's are same remember to make them seperate by uisng AS other than it will mappped as same key.

GET 调用：已添加具有相同键的项目。关键：身份证

GET Call: An item with the same key has already been added. Key: Id

c#

sql-server

asp.net-core-mvc

.net-core

asp.net-core-webapi