Question

我有一个存储过程如下。请参阅第1行/第2行用于设置datacontext。我从这里的一个帖子中读到了这个。在我的C＃代码中，我按如下方式调用此存储过程。我可以在数据库中看到存储过程的结果。我可以在数据库中看到2条结果记录。

但是从下面的C＃代码调用返回计数2，但两个记录都为null和0。请帮忙。

public class UnreadAlerts
{
        public string alertName { get; set; }
        public int alertValue { get; set; }
}

public List<UnreadAlerts> AllUnreadAlertsCount(int userId)
{
    List<UnreadAlerts> Sdetails = new List<UnreadAlerts>();

    using (var context1 = new AltusEntities())
    {
        Sdetails = context1.Database.SqlQuery<UnreadAlerts>("[dbo].[sp_UnreadAlertsCount] @userid",
                new SqlParameter("@userid", userId)
                ).ToList();
    }

    return Sdetails;
}

存储过程代码：

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO

ALTER Procedure [dbo].[sp_UnreadAlertsCount]  
    @userId int  
AS
BEGIN
    IF 1 = 2 
    BEGIN
        SELECT
            cast(null as nvarchar(50))  as Aname
            ,cast(null as int)    as Avalue
        WHERE
            1 = 2  
    END

    CREATE TABLE #Results  
    (  
        Aname nvarchar(50),  
        Avalue int  
    )  

    INSERT INTO #Results (Aname, Avalue)  
        SELECT
            'ProximityAlerts',
            COUNT(DISTINCT ProximityMeetingAlertID) 
        FROM
            AltusRt.dbo.ProximityMeetingAlerts pma  
        JOIN
            AltusRt.dbo.ProximityMeetings pm ON pma.ProximityMeetingID = pm.ProximityMeetingID  
        WHERE
            pm.RequestID IN (SELECT r.RequestId 
                             FROM Users u 
                             JOIN Requests r ON u.UserId = r.CreatedByUserId
                             WHERE u.UserId = @userId 
                               AND r.CreatedByUserId = @userId)  

        INSERT INTO #Results (Aname,Avalue)  
            SELECT
                'MonitorAlerts',
                COUNT(*) 
            FROM 
                dbo.TargetGeoFenceResult 
            WHERE
                ActiveStatus = 1  

        SELECT Aname, Avalue 
        FROM #Results
    END

Answer 1

列名称和属性名称不匹配。因此，这些值永远不会复制到UnreadAlerts实例，并且您会看到默认值int和string。

现在您可以通过更改属性名称来修复它：

public class UnreadAlerts
{
    public string Aname{ get; set; }
    public int Avalue { get; set; }
}

或者，使用[ColumnAttribute]：

进行别名

public class UnreadAlerts
{
    [Column(Name = "Aname")]
    public string alertName { get; set; }
    [Column(Name = "Avalue")]
    public int alertValue { get; set; }
}

即使在设置datacontract之后，Entity Framework在使用临时表调用存储过程时返回null

1 个答案: