(int)faultsGroup是0或1但我总是得到这个错误：列’FaultGroup’不能为null

有人告诉我为什么吗？语法看起来不错.

MySqlCommand cmdAdd = new MySqlCommand("INSERT INTO Faults (" +

" FaultGroup, Text, Date, IP" +

") VALUES (" +

" @FaultGroup, @Text, @Date, @IP" +

")", conn);

MySqlParameter paramFaultGroup = new MySqlParameter("@FaultGroup", MySqlDbType.Int32);

FaultsGroup faultsGroup = (FaultsGroup) Enum.Parse(typeof (FaultsGroup), myFault.FaultGroup);

paramFaultGroup.Value = (int) faultsGroup;

cmdAdd.Parameters.Add(paramFaultGroup);

cmdAdd.ExecuteNonQuery();