通过DataTable导出Excel文件


#region 导出为EXCEL

        //第一种方法是直接导出Excel。

        /// <summary>

        /// 将DataTable或DataSet导出为Excel

        /// 修改  2016/7/6

        /// </summary>

        /// <param name="dt">需要导出的DataTable,DataSet或GridView</param>

        /// <param name="AbosultedFilePath">Excel的绝对路径</param>

        /// <returns>是否成功</returns>

        public static bool ExportToExcel(System.Data.DataTable dt, string AbosultedFilePath)

        {

            if (dt == null)

                return false;

            // 创建Excel应用程序对象

            Microsoft.Office.Interop.Excel.Application excApp = new Microsoft.Office.Interop.Excel.Application();

            Microsoft.Office.Interop.Excel.Workbook workBook = excApp.Workbooks.Add(Microsoft.Office.Interop.Excel.XlWBATemplate.xlWBATWorksheet);

            Microsoft.Office.Interop.Excel.Worksheet workSeet = workBook.Worksheets[1]; //取得sheet1

            Microsoft.Office.Interop.Excel.Range range = null;

            int tableCount = dt.Rows.Count;

            int rowRead = 0;

            float percent = 0;

            for (int i = 0; i < dt.Columns.Count; i++)

            {

                workSeet.Cells[1, i + 1] = dt.Columns[i].ColumnName;

                //设置标题的样式

                range = (Microsoft.Office.Interop.Excel.Range)workSeet.Cells[1, i + 1];

                range.Font.Bold = true; //粗体

                range.Font.Size = "12";//字体大小

                range.Font.Name = "宋体";

                range.HorizontalAlignment = Microsoft.Office.Interop.Excel.XlHAlign.xlHAlignCenter; //居中

                range.BorderAround(Microsoft.Office.Interop.Excel.XlLineStyle.xlContinuous, Microsoft.Office.Interop.Excel.XlBorderWeight.xlThin, Microsoft.Office.Interop.Excel.XlColorIndex.xlColorIndexAutomatic, null); //背景色

                range.EntireColumn.AutoFit(); //自动设置列宽

                range.EntireRow.AutoFit(); //自动设置行高

               

            }

            for (int r = 0; r < dt.Rows.Count; r++)

            {

                for (int c = 0; c < dt.Columns.Count; c++)

                {

                    //写入内容

                    workSeet.Cells[r + 2, c + 1] = "'" + dt.Rows[r][c].ToString();

                    //设置样式

                    range = (Microsoft.Office.Interop.Excel.Range)workSeet.Cells[r + 2, c + 1];

                    range.Font.Size = 9; //字体大小

                    range.BorderAround(Microsoft.Office.Interop.Excel.XlLineStyle.xlContinuous, Microsoft.Office.Interop.Excel.XlBorderWeight.xlThin, Microsoft.Office.Interop.Excel.XlColorIndex.xlColorIndexAutomatic, null); //加边框

                    range.EntireColumn.AutoFit(); //自动调整列宽

                }

                rowRead++;

                percent = ((float)(100 * rowRead)) / tableCount;

                System.Windows.Forms.Application.DoEvents();

            }

            range.Borders[Microsoft.Office.Interop.Excel.XlBordersIndex.xlInsideHorizontal].Weight = Microsoft.Office.Interop.Excel.XlBorderWeight.xlThin;

            if (dt.Columns.Count > 1)

            {

                range.Borders[Microsoft.Office.Interop.Excel.XlBordersIndex.xlInsideVertical].Weight = Microsoft.Office.Interop.Excel.XlBorderWeight.xlThin;

            }

            try

            {

                workBook.Saved = true;

                workBook.SaveCopyAs(AbosultedFilePath);

            }

            catch { }

            workBook.Close();

            if (excApp != null)

            {

                excApp.Workbooks.Close();

                excApp.Quit();

                int generation = System.GC.GetGeneration(excApp);

                System.Runtime.InteropServices.Marshal.ReleaseComObject(excApp);

                excApp = null;

                System.GC.Collect(generation);

            }

            GC.Collect(); //强行销毁

            #region 强行杀死最近打开的Excel进程

            System.Diagnostics.Process[] excelProc = System.Diagnostics.Process.GetProcessesByName("EXCEL");

            System.DateTime startTime = new DateTime();

            int m, killID = 0;

            for (m = 0; m < excelProc.Length; m++)

            {

                if (startTime < excelProc[m].StartTime)

                {

                    startTime = excelProc[m].StartTime;

                    killID = m;

                }

            }

            if (excelProc[killID].HasExited == false)

            {

                excelProc[killID].Kill();

            }

            #endregion

            return true;

        }

        //第二种方法为通过设置好的模板在导出Excel。

        /// <summary>   

        /// 把table中的数据导出到excel中去   

        /// </summary>   

        /// <param name="dt">要导入的table</param>   

        /// <param name="maxcount">模板excel中，一个sheet要显示的行数,如果数据多一个sheet中的最大值，会自动生成新的sheet</param>

        private void ExportExcel(System.Data.DataTable dt, int maxcount, string filepath, string fileautoname)   

        {       

            Random ran = new Random();      

            object missing = Type.Missing;       

            Microsoft.Office.Interop.Excel.Application application = new Application();       

            Workbook workbook = application.Workbooks.Open(filepath, missing, missing, missing, missing, missing, missing, missing, missing, missing, missing, missing, missing, missing, missing);       

            Worksheet worksheet;       

            worksheet = (Worksheet)workbook.Sheets.get_Item(1);               

            DataView dv = dt.DefaultView;       

            //dv.Sort = "id asc"; //table 中的数据按id升序排列       

            System.Data.DataTable table = dv.ToTable();               

            int sheetcount = GetSheetCount(table.Rows.Count, maxcount);       

            for (int count = 1; count < sheetcount; count
bdeb
++)       

            {           

                ((Microsoft.Office.Interop.Excel.Worksheet)workbook.Worksheets.get_Item(count)).Copy(missing, workbook.Worksheets[count]);       

            }       

            List<object[,]> list = new List<object[,]>();       

            object[,] ret;       

            for (int count = 0; count < sheetcount; count++)       

            {           

                if (count == sheetcount - 1)           

                {               

                    ret = new object[table.Rows.Count - count * maxcount, table.Columns.Count - 0];               

                    for (int i = 0; i < table.Rows.Count - count * maxcount; i++)               

                    {                    for (int j = 0; j < table.Columns.Count - 0; j++)  //修改过                 

                    {                       

                        ret[i, j] = table.Rows[count * maxcount + i][j];                   

                    }               

                    }               

                    list.Add(ret);           

                }           

                else           

                {               

                    ret = new object[maxcount, table.Columns.Count - 2];               

                    for (int i = 0; i < maxcount; i++)               

                    {                   

                        for (int j = 0; j < table.Columns.Count - 2; j++)                   

                        {                       

                            ret[i, j] = table.Rows[i + count * maxcount][j];                   

                        }               

                    }               

                    list.Add(ret);           

                }       

            }       

            object[,] obj;       

            for (int p = 0; p < list.Count; p++)       

            {           

                worksheet = (Worksheet)workbook.Sheets.get_Item(p + 1);           

                obj = list[p];           

                string cn = "G" + (obj.GetLength(0) + 1).ToString(); //设置填充区域  修改过         

                worksheet.get_Range("A2", cn).FormulaR1C1 = obj;        //修改过

            }       

            workbook.SaveAs(fileautoname, missing, missing, missing, missing, missing, Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlNoChange, missing, missing, missing, missing, missing);       

            workbook.Close(missing, missing, missing);       

            application.Quit();       

            workbook = null;

            #region 强行杀死最近打开的Excel进程

            System.Diagnostics.Process[] excelProc = System.Diagnostics.Process.GetProcessesByName("EXCEL");

            System.DateTime startTime = new DateTime();

            int m, killID = 0;

            for (m = 0; m < excelProc.Length; m++)

            {

                if (startTime < excelProc[m].StartTime)

                {

                    startTime = excelProc[m].StartTime;

                    killID = m;

                }

            }

            if (excelProc[killID].HasExited == false)

            {

                excelProc[killID].Kill();

            }

            #endregion

        }

        /// <summary>   

        ///  获取WorkSheet数量   

        /// </summary>   

        /// <param name="rowCount">记录总行数</param>   

        /// <param name="rows">每WorkSheet行数</param>   

        /// <returns></returns>   

        private int GetSheetCount(int rowCount,int rows)   

        {       

            int n = rowCount % rows;        //余数       

            if(n == 0)           

                return rowCount / rows;       

            else           

                return Convert.ToInt32(rowCount / rows) + 1;   

        }

        #endregion

        //通过Excel导出数据到DataTable

        /// <summary>

        /// 将Excel文件导入到datatable中

        /// </summary>

        /// <param name="strpath">文件路径</param>

        /// <returns></returns>

        public static DataTable ExcelTOdt(string strpath)

        {

            string FileType = strpath.Substring(strpath.IndexOf("."));

            string strConn;

           

            strConn = "Provider=Microsoft.Jet.OLEDB.4.0;Extended Properties=\"Excel 8.0;HDR=Yes;IMEX=1\";Data Source=" + strpath;

            if (FileType==".xlsx")

            {

                strConn = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + strpath + ";Extended Properties='Excel 12.0;HDR=Yes;IMEX=1';";

            }

            OleDbConnection conn = new OleDbConnection(strConn);

            conn.ConnectionString = strConn;

            conn.Open();

            DataTable sheetNames = conn.GetOleDbSchemaTable(System.Data.OleDb.OleDbSchemaGuid.Tables, new object[] { null, null, null, "TABLE" });

            List<string> sheetList = new List<string>();

            foreach (DataRow dr in sheetNames.Rows)

            {

                sheetList.Add(dr[2].ToString());

            }

            string sql = string.Format("select * from [{0}]", sheetList[0].ToString());

            OleDbDataAdapter ola = new OleDbDataAdapter(sql, conn);

            DataTable dt = new DataTable();

            ola.Fill(dt);

            conn.Close();

            //OleDbDataAdapter myCommand = new OleDbDataAdapter("SELECT * FROM [Sheet1$]", strConn);

            //DataTable dt = new DataTable();

            //myCommand.Fill(dt);

            return dt;

        }