OleDb方式读取excel,和现实不符

开始时候按照严格的excel模板来执行,数据都是严格要求的,可是到了客户那里,什么花招都来了..也不使用指定的模板了...

导致一个问题:  数据列格式不一致  比如一列 前面几个全部是数字类型,中间穿插几个以字符形式保存的数字...   直接导致这些数据读取为DbNull

怎么解决...搜索一下..发现这个是oledb的bug...不管你设置成IMEX =1 还是=2 , 他都不会读取这些数据

最终解决方案... 使用interop,首先转换成csv...然后读取文本行 ,部分代码拷贝自网络

 

            string TempPath = AppDomain.CurrentDomain.BaseDirectory + "csvTemp\\";

            if (Directory.Exists(TempPath))

            {

                Directory.Delete(TempPath, true);

            }

            Directory.CreateDirectory(TempPath);

            string filename = TempPath + Guid.NewGuid() + ".csv";

            Microsoft.Office.Interop.Excel.Application app = new Microsoft.Office.Interop.Excel.ApplicationClass();

            try

            {

                app.Visible = false;

                Workbook wBook = app.Workbooks.Add(true);

               

                app.ScreenUpdating = false;

                Workbook wb = app.Workbooks.Open(filepath, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing);



                wb.SaveAs(filename, Microsoft.Office.Interop.Excel.XlFileFormat.xlCSV, Type.Missing, Type.Missing,

                            Type.Missing,

                            Type.Missing,

                            Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlNoChange, Type.Missing,

                            Type.Missing, Type.Missing, Type.Missing,

                            Type.Missing);

                            wb.Close(false, Type.Missing, false);



                         

                

       

            app.Workbooks.Close();

            app.Quit();

            app = null;

            GC.Collect();



            String line;

            String[] split = null;

            DataTable table = new DataTable(TableName);

 



            DataRow row = null;

            StreamReader sr = new StreamReader(filename, System.Text.Encoding.Default);

            //创建与数据源对应的数据列 

            line = sr.ReadLine();

            split = line.Split(',');

            foreach (String colname in split)

            {

                table.Columns.Add(colname, System.Type.GetType("System.String"));

            }

            //将数据填入数据表 

            int j = 0;

            while ((line = sr.ReadLine()) != null)

            {

                j = 0;

                row = table.NewRow();

                split = line.Split(',');

                foreach (String colname in split)

                {

                    row[j] = colname;

                    j++;

                }

                table.Rows.Add(row);

            }

            sr.Close();

            //显示数据 

            dgclass.DataSource = table;



            importNow.Enabled = true;



            }

            catch (Exception ex)

            {

                log.Error(ex, ex);

                MessageBox.Show(this, ex.Message + "\r\n您可能没有安装excel程序");

              

            }