尝试使用Oracle Data Access ODP.NET 11.2执行ExecuteReader()时出现InvalidOperationException

Question

这是我第一次与Oracle合作,而且我们都讨厌在你使用特定模型的同时使用外国产品,尽管这是我们的工作,我们必须做到.

现在我已经安装了Oracle 11g,并复制并引用了Oracle.DataAccess.dll,创建了一个方法,用于打开连接并尝试从服务器上创建的视图中检索某些对象.

方法:

public BindingList<HeaderReceiver> GetHeaderReceivers()
{
    try
    {
        using (OracleConnection db = new OracleConnection(BaseDataAccess.ConnString))
        {
            string cmdText = "select * from p_customer t";
            BindingList<HeaderReceiver> headerReceivers = new BindingList<HeaderReceiver>();

            OracleCommand cmd = new OracleCommand(cmdText) { CommandType = CommandType.Text };
            db.Open();

            OracleDataReader reader = cmd.ExecuteReader(CommandBehavior.CloseConnection); <--- Error Occurs HERE!!!

            while (reader.Read())
                headerReceivers.Add(HeaderReceiver.GetInstance(reader));

            CustBranchRepository rep = new CustBranchRepository();
            headerReceivers.ForEach(p => p.DetailsBranch = rep.GetDetailReceivers(p.Id));

            reader.Close();
            db.Close();
            return headerReceivers;
        }
    }
    catch (Exception ex)
    {
        ExporterLogger.Log(ex);
        return null;
    }
}

现在,当ExecuteReader()提交时,我得到了这个InvalidOperationException.

Operation is not valid due to the current state of the object.

StackTrace:

   at Oracle.DataAccess.Client.OracleCommand.ExecuteReader(Boolean requery, Boolean fillRequest, CommandBehavior behavior)
   at Oracle.DataAccess.Client.OracleCommand.ExecuteReader(CommandBehavior behavior)
   at Exporter.Boss.DataAccess.CustomerRepository.GetHeaderReceivers() in ...Exporter\Exporter.Boss.DataAccess\CustomerRepository.cs:line 25

任何想法和帮助......

谢谢!

Answer 1

看起来你错过了命令对象上的连接......

db.Open();
OracleCommand cmd = new OracleCommand(cmdText) { CommandType = CommandType.Text };
cmd.Connection = db;