c# - 更新数据库出错

Question

我正在尝试更新数据库。当我只添加一行时，它没有问题。但是，当我使用更改值的数据集更新数据库时，会出现错误：

`System.Data.DBConcurrencyException：并发冲突：UpdateCommand 影响了预期 Y 记录的 X。（对不起荷兰人。我会尽快找到错误的英文版本。）

internal void updateDataSet(DataSet ds1)
    {
        using (SqlConnection _con = new SqlConnection("server=(local)\\SQLExpress;database=Alarmen;integrated Security=SSPI;"))
        {
            openConnection(_con);
            log.Info("Database wordt geupdate");
            try
            {

                var con = new SqlConnection(connectionString);
                var adapter = new SqlDataAdapter("SELECT * FROM dbo.tbl_alarmen", con);
                new SqlCommandBuilder(adapter);

                //
                // Fill the DataAdapter with the values in the DataTable.
                //
                adapter.Fill(ds1, "Alarmen");
                //
                // Open the connection to the SQL database.
                //
                //con.Open();
                //
                // Insert the data table into the SQL database.
                //
                adapter.Update(ds1, "Alarmen");

                log.Info("Database geupdate van ds1");
            }
            catch (Exception err)
            {
                log.Info("Database updaten mislukt " + err);
            }
            //closeConnection(_con);
        } 

    string sql = "SELECT * FROM tbl_alarmen";
    SqlCommand _cmd;
    SqlDataAdapter _dap;

    internal void openConnection(SqlConnection _con)
    {
        log.Info("Database wordt geopend");

        try
        {
            _con.Open();
        }
        catch (Exception ex)
        {
            log.Info("Database kon niet geopend worden " + ex);
        }

    }

    internal void closeConnection(SqlConnection _con)
    {
        log.Info("Database wordt gesloten");
        try
        {
            _con.Close();
        }
        catch (Exception ex)
        {
            log.Info("Database sluiten mislukt " + ex);
        }

    }

我知道尝试/捕获很奇怪。现在我可以更容易地看到问题的显示位置。我会在发布前更改它。

我将添加一些有关填充数据表背后的代码的信息：如果状态 == 活动，则表示它是一个新警报。在 else 语句中，这意味着它是一个需要更新状态的现有警报。

if (Status == "Active")
            {
                log.Info("Nieuw Alarm met " + AlarmName + " " + InstanceID + " " + Status + " " + VMSID);
                DataRow dRow = ds1.Tables["Alarmen"].NewRow();
                dRow[0] = ds1.Tables["Alarmen"].Rows.Count + 1;//Creating the primary key.
                dRow[1] = VMSID;
                dRow[2] = InstanceID;
                dRow[3] = AlarmName;
                dRow[4] = Priority;
                dRow[5] = TriggerTime;
                dRow[6] = Source;
                dRow[7] = TriggerEvent;
                dRow[8] = Status;
                dRow[9] = AckType;
                dRow[10] = AckBy;
                dRow[11] = AckTime;
                dRow[12] = CreationTimeStamp;
                dRow[13] = PropagationLevel;
                dRow[14] = AlarmRunningState;
                dRow[15] = Destination;
                dRow[16] = AlarmContext;
                dRow[17] = AlarmGuid;
                ds1.Tables["Alarmen"].Rows.Add(dRow);

                interf.nieuwAlarm("Nieuw alarm ", dRow);
            }
            else
            {
                bool containTest = false;
                log.Info("Status is not active " + Status);
                for (int i = 0; i < ds1.Tables["Alarmen"].Rows.Count; i++)
                {
                    DataRow dRow = ds1.Tables["Alarmen"].Rows[i];
                    string id = dRow[2].ToString();
                    string vms = dRow[1].ToString();
                    if (vms.Contains(VMSID) && id.Contains(InstanceID))
                    {
                        containTest = true;

                        dRow[8] = Status;
                        dRow[10] = AckBy;
                        dRow[11] = AckTime;
                        ds1.Tables["Alarmen"].Rows[i].ItemArray[8] = Status;
                        ds1.Tables["Alarmen"].Rows[i].ItemArray[10] = AckBy;
                        ds1.Tables["Alarmen"].Rows[i].ItemArray[11] = AckTime;
                        interf.changedAlarm("Veranderd alarm", dRow);
                    }
                }
                if (containTest == false)
                {
                    log.Info("Onbekend Alarm is acknowledged " + InstanceID + " " + VMSID);

                }
                //Log er in zetten mocht het alarm niet voorkomen in de database
            }

            dc.updateDataSet(ds1);

在“dc.updateDataSet(ds1);” 是对类的声明，其中包含用于打开和更新数据库的代码。