使用SqlDataReader的DateTime2到C#DateTime
作者:互联网
我意识到这可能是一个骗局,但我花了几个小时寻找答案,似乎无法找到答案.
我目前正在创建一个检索Concert数据的Web API.
我有一个SQL Server表,其中包含一个开始和结束日期,两者都作为datetime2类型.我已经以这种格式插入了日期,它们在查看数据库时不会出现任何问题:
2015-10-08T20:00:00.0000000+01:00
我的模特:
public class Concert
{
public int Id { get; set; }
public string Name { get; set; }
public int LocationId { get; set; }
[Column(TypeName = "DateTime2")]
public DateTime Start { get; set; }
[Column(TypeName = "DateTime2")]
public DateTime End { get; set; }
public string Description { get; set; }
public string Url { get; set; }
}
我的类中的方法会调出我的数据库数据:
public List<Concert> getAll()
{
List<Concert> concerts = new List<Concert>();
SqlConnection connection = CasWebAPIdb.getConnection();
String selectAll = "SELECT ConcertId, ConcertName, ConcertLocationId FROM dbo.Concerts";
SqlCommand selectCommand = new SqlCommand(selectAll, connection);
try
{
connection.Open();
SqlDataReader reader = selectCommand.ExecuteReader();
var isoDateTimeFormat = CultureInfo.InvariantCulture.DateTimeFormat;
while (reader.Read())
{
//Debug.WriteLine("lol: " + reader["ConcertEnd"].GetType());
Concert concert = new Concert();
concert.Id = (int)reader["ConcertId"];
concert.Name = reader["ConcertName"].ToString();
concert.LocationId = (int)reader["ConcertLocationId"];
concert.Start = (DateTime)reader["ConcertStart"];
concert.End = (DateTime)reader["ConcertEnd"];
concerts.Add(concert);
}
}
catch (SqlException ex)
{
throw ex;
}
finally
{
connection.Close();
}
return concerts;
}
}
调试时出现此错误:
An exception of type ‘System.IndexOutOfRangeException’ occurred in System.Data.dll but was not handled in user code
我已经尝试了很多东西并且遵循了很多示例和代码,但我似乎无法正确地转换它.有人有想法吗?
解
我忘了在我的查询中添加’concertStart’和’concertEnd’.
问题解决了,谢谢!
解决方法:
首先,如果你想读取ConcertStart和ConcertEnd的值,你必须将它们包含在SELECT !! $中
string selectAll = @"SELECT ConcertId, ConcertName, ConcertLocationId,
ConcertStart, ConcertEnd <<--- add these!!
FROM dbo.Concerts";
试试这个:
while (reader.Read())
{
Concert concert = new Concert();
concert.Id = (int)reader["ConcertId"];
concert.Name = reader["ConcertName"].ToString();
concert.LocationId = (int)reader["ConcertLocationId"];
concert.Start = reader.GetFieldValue<DateTime>(reader.GetOrdinal("ConcertStart"));
concert.End = reader.GetFieldValue<DateTime>(reader.GetOrdinal("ConcertEnd"));
concerts.Add(concert);
}
我毫不费力地从SQL Server数据库中读取DATETIME2(3)值
reader.GetFieldValue<DateTime>(reader.GetOrdinal("ConcertEnd"));
那对你有用吗?
标签:c,datetime,sql-server,sqldatareader,datetime2 来源: https://codeday.me/bug/20190528/1171327.html