如何修复“值不能为空。参数名称：值”

Question

我正在尝试基于数据表行创建多个线程，如果表中有 10 行，则会创建 10 个线程。 我不断收到此错误“值不能为空。参数名称：值”。 我在这缺少什么？

我在 Savedata 方法中的第一个 catch 语句中出现错误，即“内部异常”注释。

try
{
    DataProvider DPrvdr = new DataProvider();
    DPrvdr.ConnectionString = strConMAS500; // read only

    //getting all the sales order 
    DataTable dt = DPrvdr.GetDataSetSProc("uspMAS500SOSER_GetSO").Tables[0];
    List<DataTable> lstDt = SplitTable(dt, MaxSOinThread); // Split the Data table as per MaxSO in Threads - Currently it is 1

    if (lstDt != null)
    {
        Parallel.ForEach(lstDt, (currentdt) =>
        {
            hashSOTbl = Savedata(currentdt);
        });
    }
}
catch (Exception ex)
{
    LogMessage("Error " + ex.Message);
}


    protected Hashtable Savedata(DataTable dt)
    {
        SOEntityBOLWS_Client c = new SOEntityBOLWS_Client();
        Hashtable hashSODetails = new Hashtable();

        for (int i = 0; i < dt.Rows.Count; i++)
        {
            try
            {
                //initializing the SO object
                SOEntityForClient.SalesOrder s = c.GetNewSO(dt.Rows[i]["CreatedBy"].ToString(), dt.Rows[i]["SessionID"].ToString());
                string SONO = string.Empty;
                s.CustID = dt.Rows[i]["CustID"].ToString().Trim();
                s.CompanyID = dt.Rows[i]["CompanyID"].ToString().Trim();
                s.CustPONo = dt.Rows[i]["CustPONo"].ToString();                 

                s.CustClassID = (dt.Rows[i]["CustClassID"].ToString());
                s.SalesSourceID = (dt.Rows[i]["SalesSourceID"].ToString());
                s.CreateUserID = (dt.Rows[i]["CreatedBy"].ToString());
                int rowkey = Convert.ToInt32(dt.Rows[i]["RowKey"].ToString());                  

                DataProvider DPrvdrheaderComment = new DataProvider();
                DPrvdrheaderComment.ConnectionString = strConMAS500; // read only
                SqlParameter[] sqlHeaderComment = new SqlParameter[2];
                sqlHeaderComment[0] = new SqlParameter("@DocOwnerKey", rowkey);
                sqlHeaderComment[1] = new SqlParameter("@ParentDocType", 801);//801 for header comment

                //getting Comment               
                DataTable dtHeaderComment = DPrvdrheaderComment.GetDataSetParams("uspMAS500SOSER_GetSOComments", sqlHeaderComment).Tables[0];
                if (dtHeaderComment.Rows.Count > 0)
                {
                    s.Comments = new List<SOEntityForClient.Comment>();
                    for (int m = 0; m < dtHeaderComment.Rows.Count; m++)
                    {

                        SOEntityForClient.Comment cm = new SOEntityForClient.Comment();
                        cm.CommentText = dtHeaderComment.Rows[m]["CommentText"].ToString();
                        cm.ExtCmntID = dtHeaderComment.Rows[m]["ExtCommentID"].ToString();
                        cm.ParentDocType = 801;
                        cm.SeqNo = m + 1;
                        s.Comments.Add(cm);
                    }
                }                  


                DataProvider DPrvdrLine = new DataProvider();
                DPrvdrLine.ConnectionString = strConMAS500; // read only
                SqlParameter[] sqlline = new SqlParameter[1];
                sqlline[0] = new SqlParameter("@RowKey", rowkey);           

                DataTable dtLine = DPrvdrLine.GetDataSetParams("uspMAS500SOSER_GetSOLine", sqlline).Tables[0];  

                for (int k = 0; k < dtLine.Rows.Count; k++)
                {
                    SOEntityForClient.SOLine l = new SOEntityForClient.SOLine();
                    l.ItemID = dtLine.Rows[k]["ItemID"].ToString();
                    //l.Description = dtLine.Rows[k]["Description"].ToString();
                    l.QtyOrd = Convert.ToDecimal(dtLine.Rows[k]["QtyOrd"].ToString());
                    l.UnitMeasID = dtLine.Rows[k]["UnitMeasID"].ToString();
                    l.UnitPrice = Convert.ToDecimal(dtLine.Rows[k]["UnitPrice"].ToString());
                    l.TradeDiscPct = Convert.ToDecimal(dtLine.Rows[k]["TradeDiscPct"].ToString());
                    l.WhseID = dtLine.Rows[k]["WarehouseID"].ToString();
                    l.PromiseDate = DateTime.Parse(dt.Rows[i]["DfltPromDate"].ToString());
                    l.RequestDate = DateTime.Parse(dt.Rows[i]["DfltRequestDate"].ToString());
                    l.ShipDate = DateTime.Parse(dt.Rows[i]["DfltShipDate"].ToString());                      

                    DPrvdrLineComment = new DataProvider();
                    DPrvdrLineComment.ConnectionString = strConMAS500; // read only
                    SqlParameter[] sqlComment = new SqlParameter[2];
                    sqlComment[0] = new SqlParameter("@DocOwnerKey", (dtLine.Rows[k]["SOLineKey"].ToString()));
                    sqlComment[1] = new SqlParameter("@ParentDocType", 802);//802 for line comment

                    //getting Comment
                    DataTable dtLineComment = DPrvdrLineComment.GetDataSetParams("uspMAS500SOSER_GetSOComments", sqlComment).Tables[0];
                    if (dtLineComment.Rows.Count > 0)
                    {
                        l.SOLineComments = new List<SOEntityForClient.Comment>();
                        for (int m = 0; m < dtLineComment.Rows.Count; m++)
                        {
                            SOEntityForClient.Comment cm = new SOEntityForClient.Comment();
                            cm.CommentText = dtLineComment.Rows[m]["CommentText"].ToString();
                            cm.ExtCmntID = dtLineComment.Rows[m]["ExtCommentID"].ToString();
                            cm.ParentDocType = 802;//802 for line comment
                            cm.SeqNo = m + 1;
                            l.SOLineComments.Add(cm);
                        }
                    }
                    //Save SO line.
                    s.LineItems.Add(l);                       
                }

                try
                {
                    //checking line count
                    if (s.LineItems.Count != 0)
                    {
                        int UpdateProcessStatus = 0;
                        try
                        {
                            string warning = c.SaveSO((dt.Rows[i]["CreatedBy"].ToString()), (dt.Rows[i]["CompanyID"].ToString().Trim()), dt.Rows[i]["TranNo"].ToString(), "801", s, dt.Rows[i]["SessionID"].ToString(), "OverrideDate:true");

                            if (warning.Contains("Saved"))
                            {
                                hashSODetails.Add(dt.Rows[i]["TranNo"].ToString(), dt.Rows[i]["CompanyID"].ToString());
                                UpdateProcessStatus = 1;
                            }
                            else
                            {
                                UpdateProcessStatus = 0;
                            }


                            DPrvdr = new DataProvider();
                            DPrvdr.ConnectionString = strConMAS500; 
                            SqlParameter[] sqlParam = new SqlParameter[4];

                            sqlParam[0] = new SqlParameter("@Tranno", dt.Rows[i]["TranNo"].ToString()); 
                            sqlParam[1] = new SqlParameter("@Message", warning); 
                            sqlParam[2] = new SqlParameter("@UpdateProcessStatus", UpdateProcessStatus); 
                            sqlParam[3] = new SqlParameter("@CompanyID", (dt.Rows[i]["CompanyID"].ToString())); 

                            DPrvdr.InsertDeleteUpdateDataStrProc("uspMAS500SOSER_SaveSOStatus", sqlParam);                               
                        }
                        catch (Exception ex)
                        {
                            throw ex;
                        }
                    }
                }
                catch (Exception ex)
                {
                    LogMessage("Error while calling web service for Row Key : " + (dt.Rows[i]["RowKey"].ToString()) + " inner excep : " + ex.Message);
                }
            }

            catch (Exception ex)
            {
                LogMessage("Error while calling web service for Row Key : " + (dt.Rows[i]["RowKey"].ToString()) + " outter excep : " + ex.Message);
            }
        }
        return hashSODetails;
    }

Answer 1

DataTable dt = new DPrvdr.GetDataSetSProc("uspMAS500SOSER_GetSO").Tables[0];