[英]MVC5 C# - System.IndexOutOfRangeException
我正在尝试使用MVC5 C#从SQL数据库检索数据并将数据存储到ViewBag
数组中。 但是,该代码导致IndexOutOfRangeException
错误。
query = "SELECT Id, UserName, List_Order FROM AspNetUsers WHERE LoggedIn = 1 ORDER BY
List_Order ASC";
SqlConnection conn = new SqlConnection(System.Configuration.ConfigurationManager
.ConnectionStrings["DefaultConnection"].ConnectionString);
SqlCommand cmd = new SqlCommand(query, conn);
conn.Open();
SqlDataReader rdr = cmd.ExecuteReader();
int n = 0;
while(rdr.Read())
{
if (rdr["UserName"].ToString() != null)
{
//Exception Details: System.IndexOutOfRangeException: LoggedIn
ViewBag.speakers[n] = new string[4] { rdr["Id"].ToString(), rdr["UserName"]
.ToString(), rdr["List_Order"].ToString(), rdr["LoggedIn"].ToString() };
n++;
}
}
解决方案是我忘记将LoggedIn
列添加到查询中。
query = "SELECT Id, UserName, List_Order, LoggedIn FROM AspNetUsers WHERE LoggedIn = 1
ORDER BY List_Order ASC";
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