Question

我使用以下代码调用SQL Server数据库中的存储过程。

我们的想法是将相关事件添加到EventSchedule模型属性的列表中，但代码返回

指定的演员表无效

错误。存储过程从我构建的视图中提取数据。调用堆栈显示错误在第96行，不确定是否会帮助任何人。我想我可能需要另一双眼睛才能看到我在这里失踪的东西。

var command = new SqlCommand("GetEvents", conn)
{
    CommandType = CommandType.StoredProcedure
};

command.Parameters.Add(new SqlParameter("Id", SqlDbType.BigInt, 0, "id"));
command.Parameters[0].Value = schedule.LeagueId;

using (var reader = command.ExecuteReader())
{
    while (reader.Read())
    {
        //line 96
        var _event = new Event
        {
            EventId = (Int64) reader["eventid"],
            HomeTeamId = (Int64) reader["home_team_id"],
            TeamName = (string) reader["team_name"],
            HomeTeamScore = (int) reader["home_team_score"],
            AwayTeamId = (Int64) reader["away_team_id"],
            AwayTeamName = (string) reader["Expr1"],
            AwayTeamScore = (int) reader["away_team_score"],
            WinningTeamId = (Int64) reader["winning_teamid"],
            EventStartDttm = (DateTime) reader["event_start_dttm"],
            CurrentDttm = (DateTime) reader["current_dttm"],
            Locked = (bool) reader["locked"]
        };

        schedule.Events.Add(_event);
    }
}

return schedule;

型号：

public class EventSchedule
{
    public Int64 UserId { get; set; }
    public Int64 LeagueId { get; set; }
    public string League { get; set; }
    public int Season { get; set; }
    public int Week { get; set; }
    public IList<Event> Events { get; set; }
}

public class Event
{
    public Int64 EventId { get; set; }
    public Int64 HomeTeamId { get; set; }
    public string TeamName { get; set; }
    public int? HomeTeamScore { get; set; }
    public Int64 AwayTeamId { get; set; }
    public string AwayTeamName { get; set; }
    public int? AwayTeamScore { get; set; }
    public Int64 WinningTeamId { get; set; }
    public DateTime EventStartDttm { get; set; }
    public DateTime CurrentDttm { get; set; }
    public bool Locked { get; set; }
}

存储过程：

ALTER PROCEDURE [dbo].[GetEvents]
    @Id int
AS
BEGIN
    SET NOCOUNT ON;

    SELECT 
       eventid, 
       home_team_id, 
       team_name, 
       home_team_score, 
       away_team_id, 
       Expr1, 
       away_team_score, 
       winning_teamid, 
       event_start_dttm, 
       current_dttm, 
       locked 
    FROM 
       leagueScheduleForCurrentWeek 
    WHERE 
       id = @Id
END

Answer 1

你的问题来自于你的一个演员表失败，很可能是你的模型中的一个可空类型。对于可为空的类型，从强制类型转换为使用as，这将导致DbNull.Value（这是读者返回的内容）为您想要的空值。

    var _event = new Event
    {
        EventId = (Int64) reader["eventid"],
        HomeTeamId = (Int64) reader["home_team_id"],
        TeamName = (string) reader["team_name"],
        HomeTeamScore = reader["home_team_score"] as int?, //here
        AwayTeamId = (Int64) reader["away_team_id"],
        AwayTeamName = (string) reader["Expr1"],
        AwayTeamScore = reader["away_team_score"] as int?, //and here
        WinningTeamId = (Int64) reader["winning_teamid"],
        EventStartDttm = (DateTime) reader["event_start_dttm"],
        CurrentDttm = (DateTime) reader["current_dttm"],
        Locked = (bool) reader["locked"]
    };

如果您的问题仍然存在，那么您的模型与您的数据表不匹配。你需要通过你的类型来找出哪一个不匹配。你可以通过从构造函数中删除赋值来使自己更容易。

    var _event = new Event();

    _event.EventId = (Int64) reader["eventid"];
    _event.HomeTeamId = (Int64) reader["home_team_id"];
    _event.TeamName = (string) reader["team_name"];
    _event.HomeTeamScore = reader["home_team_score"] as int?;
    _event.AwayTeamId = (Int64) reader["away_team_id"];
    _event.AwayTeamName = (string) reader["Expr1"];
    _event.AwayTeamScore = reader["away_team_score"] as int?;
    _event.WinningTeamId = (Int64) reader["winning_teamid"];
    _event.EventStartDttm = (DateTime) reader["event_start_dttm"];
    _event.CurrentDttm = (DateTime) reader["current_dttm"];
    _event.Locked = (bool) reader["locked"];

＆＃39;指定演员表无效＆＃39;调用SQL Server存储过程时出错

1 个答案: