在DataTable中设置特定值+在DB上写入 - C＃

Question

我的计划的步骤是：

1. 阅读CSV文件
2. 从数据库中读取特定文件名（来自步骤1）的ID
3. 使用CSV文件
创建DataTable
4. 添加一个包含步骤2中ID的列
5. 将结果写在数据库
上

我的问题：

• ID未写入数据库

代码有几个部分。我将粘贴主要的：

1. 呼叫：

               string id_file = Get_id_file(filenameout, id_costumer);
               //MessageBox.Show("the id of the file will be: " + id_file);
   
   
               DataTable csvFileData = GetDataTabletFromCSVFile(filenameout, id_file);
   
               InsertDataIntoSQLServerUsingSQLBulkCopy(csvFileData, destinytablename);
   

2. 从DB读取：

       public static string Get_id_file(string filenameout,string id_id_costumer)
   {
   
       var fileName = Path.GetFileNameWithoutExtension(filenameout);
       string return_id_file = "";
   
       using (SqlConnection dbConnection = new SqlConnection("XXXXX"))
       {
           try
           {
               dbConnection.Open();
               SqlDataReader myReader = null;
   
               // Using the DB to find the value
               SqlCommand myCommand = new SqlCommand("select ID from TB_FILE_NAMES where path_name='" + fileName + "' and id_program='" + id_id_costumer + "'",
                                                        dbConnection);
               myReader = myCommand.ExecuteReader();
   
               while (myReader.Read())
               {
                   MessageBox.Show("the ID selected for the file is: " + myReader["ID"].ToString());
                   return_id_file = (myReader["ID"].ToString());
   
               }
   
               //return_id_file = "9999";
               return return_id_file;
   
           }
           catch (Exception e)
           {
               MessageBox.Show(e.ToString());
               return ("Error in return_id_file");
           }
   
   
       } // end of using (SqlConnection dbConnection)
   }
   

3. “GetDataTableFromCSVFile”的一部分 在这一部分，我只想将ID（在上一步中找到）设置为该特定CSV的所有行

           // Add a column with the ID of the file
       //DataColumn Col = 
       csvData.Columns.Add("ID_TB_FILE_NAMES", System.Type.GetType("System.String"));
   
       // Set a value for the entire column - ID of the File
       //var column2 = csvData.Columns["ID_TB_FILE_NAMES"];
   
       foreach (DataRow row in csvData.Rows)
       {
           //row.SetField(id_file_name, column2);
           row.SetField("ID_TB_FILE_NAMES", id_file_name);
       }
   
       return csvData;
   
   } // end of GetDataTabletFromCSVFile
   

4. 在DB上编写csvData：

      static void InsertDataIntoSQLServerUsingSQLBulkCopy(DataTable csvFileData,string destinytablename)
   {
   
   
       using (SqlConnection dbConnection = new SqlConnection("XXXXX"))
       {
   
           dbConnection.Open();
   
           // Clean the destiny table
           //string query = "TRUNCATE TABLE " + destinytablename;
           //SqlCommand cmd = new SqlCommand(query, dbConnection);
           //cmd.ExecuteNonQuery();
   
   
           using (SqlBulkCopy s = new SqlBulkCopy(dbConnection))
           {
               s.DestinationTableName = destinytablename;
               //foreach (var column in csvFileData.Columns)
               //    s.ColumnMappings.Add(column.ToString(), column.ToString());
               s.WriteToServer(csvFileData);
           }
       }
   
   
   } // end of InsertDataIntoSQLServerUsingSQLBulkCopy
   

我花了3天时间试图找出......欢迎任何帮助。

谢谢。