一開始各種不明白，弄了半天的資料庫連線字串，還非常奇怪：我就連了一次啊！！！後來馮堯給了一個思路就是：判斷資料庫中是否存在用到了EF連線了一次資料庫，批量新增資料又用到了一次資料庫，而且又寫到了一個迴圈裡面，這可能就是所謂的在一次事務當中連線了多次資料庫吧！你試試把判斷是否重複的程式碼拿出來！

//得到匯入目標表的DataTable
            Dictionary<int, DataTable> dicTargetTable = this.GetImportTable(strPath, strXMLName, dicDefaultColumn, strDBKey);
            //得到匯入第三張表的DataTable
            Dictionary<int, DataTable> dicThirdTable = this.GetThirdTable();
            //得到過程中出現的問題表
            Dictionary<int, DataTable> dicErrorTable = this.GetErrorTable();
            //資料庫連線字串
            //獲得配置檔案連結資料庫的字串
            //string connstr = ConfigurationManager.AppSettings["connectionString"];
            ITOO.Library.Core.Common.MySqlHelper mysql = new ITOO.Library.Core.Common.MySqlHelper(strDBKey);
           
           //先吧資料庫中存在的資料取出來放到一個list裡面
            List<EvaluationQuestionBank> listNew = new List<EvaluationQuestionBank>();
            for (int intTableIndex = 0; intTableIndex < dicTargetTable.Count; intTableIndex++)
            {
                if (dicTargetTable[intTableIndex].Rows.Count > 0)
                {
                    DataTable dtTarget = dicTargetTable[intTableIndex];                  
                    for (int i = 0; i < dtTarget.Rows.Count; i++)
                    {
                        EvaluationQuestionBank questionbank = new EvaluationQuestionBank();
                       // DataTable singledtTarget = new DataTable();
                        string questioncontent = dtTarget.Rows[i]["QuestionContent"].ToString();
                        string paperid = dicDefaultColumn["PaperID"].ToString();
                        //查詢該考試內容和paperid下是否有重複的內容，有則不用匯入
                        Boolean isexist = isExistPaperIdAndQuestionContent(paperid, questioncontent);
                        if (isexist == false)
                        {
                            //放入到新的list中
                            questionbank.PaperId = dicDefaultColumn["PaperID"].ToString();
                            questionbank.QuestionContent = dtTarget.Rows[i]["QuestionContent"].ToString();
                            questionbank.QuestionNo =Convert.ToInt16( dtTarget.Rows[i]["QuestionNo"]);
                            questionbank.QuestionScore= Convert.ToDecimal(dtTarget.Rows[i]["QuestionScore"].ToString());
                            questionbank.TableName = dtTarget.TableName.ToString();
                        }
                        listNew.Add(questionbank);
                    }                
 
                }
            }
 
       //然後對這個新的list提取資訊
            try
            {
                using (TransactionScope scope = new TransactionScope(TransactionScopeOption.RequiresNew))
                {
                    for (int intTableIndex = 0; intTableIndex < dicTargetTable.Count; intTableIndex++)
                    {
                        if (dicTargetTable[intTableIndex].Rows.Count > 0)
                        {
                            //DataTable dtTarget = dicTargetTable[intTableIndex];
                            //開始不同
                            StringBuilder sbSql = new StringBuilder();
 
                            for (int i = 0; i < listNew.Count; i++)
                            {
 
                                string QuestionId = System.Guid.NewGuid().ToString();
                                DateTime TimeStamp = DateTime.Now;
                                string IsDeleteQuestion = "1";
                                string QuestionOrderId = "0";
                                if (listNew[i].QuestionNo == 0)
                                {
                                    continue;
                                }
                                //sql語句拼接
                                sbSql.Append("insert into ").Append(listNew[i].TableName.ToString()).Append(" (QuestionNo,QuestionContent,QuestionScore,QuestionId,IsDeleteQuestion,QuestionOrderId,TimeStamp,PaperId) values (");
 
                                sbSql.Append("'" + listNew[i].QuestionNo+ "',")
                                .Append("'" + listNew[i].QuestionContent + "',")
                                .Append("'" + listNew[i].QuestionScore + "',")
                                .Append("'" + QuestionId + "',")
                                .Append("'" + IsDeleteQuestion + "',")
                                .Append("'" + QuestionOrderId + "',")
                                .Append("'" + TimeStamp + "',")
                                .Append("'" + dicDefaultColumn["PaperID"] + "'")
                                .Append(");");
 
                            }
                            if (sbSql.Length==0)
                            {
                                break;
                            }
                            //往SQLHelper裡面提交資料                               
                            int flag = mysql.ExecuteNonQuery(sbSql.ToString());
                        }
 
                    }
                    scope.Complete();
                }
            }
            catch (Exception e)
            {
                throw new Exception(e.Message);
            }
 
            Boolean bolIsExistErrorData = false;
            foreach (int intErrorTableIndex in dicErrorTable.Keys)
            {
                if (dicErrorTable[intErrorTableIndex].Rows.Count > 0)
                {
                    bolIsExistErrorData = true;
                }
            }
            if (bolIsExistErrorData)
            {
                return dicErrorTable;
            }
            return null;
        
 

    ITOO5.0用到了myql資料庫，很多問題都是和sqlserver不一樣的！而且mysql的修改和新增都是有限制的，只能有一個程式對同一個表進行修改和新增，所以就會造成很多問題，平時要小心，仔細，不能偷懶啊！