问连接到oracle会给出System.TypeInitializationException‘in Oracle.DataAccess.dll？

EN

    [HttpPost("InsertKlok")]
    public IActionResult InsertKlok(Klok klkregd)
    {
        string constr = "Data Source=MydataSource;User Id=MyuserId;Password=Mypassword;";
        var query = "Insert INTO KLOK(KLOK_ID, REDEN,INUIT) VALUES(" + klkregd.Klok_Id + ",'" + klkregd.Reden + "','" + klkregd.InUit + "')";
        try
        {
            OracleConnection conn = new OracleConnection(constr);
            OracleCommand command = new OracleCommand(query, conn);
            conn.Open();
            command.ExecuteNonQuery(); 
            Console.WriteLine("Record inserted");
        }
        catch (Exception e)
        {
            Console.WriteLine(e);
        }
        return Ok(klkregd);
    }

    [Route("klok/")]
    [HttpPost("AddKlok")]
    public JsonResult AddKlok(Klok klkregd)
    {
        Console.WriteLine("In registerStudent");
        KlokRegistratieAntwoord klkregdreply = new KlokRegistratieAntwoord();
        KlokRegistratie.getInstance().Add(klkregd);
        klkregdreply.Klok_Id = klkregdreply.Klok_Id;
        klkregdreply.Reden = klkregdreply.Reden;
        klkregdreply.InUit = klkregdreply.InUit;

        return Json(klkregdreply);
    }
}