导出Excel 多个sheet

using Excel = Microsoft.Office.Interop.Excel;  //"Microsoft Excel 9.0 Object Library"（Office 2000）

 public DataTable CreatTable()
    {
        DataTable dt = new DataTable();
        dt.Columns.Add("EventID", System.Type.GetType("System.String"));
        dt.Columns.Add("ItemName", System.Type.GetType("System.String"));
        dt.Columns.Add("EventName", System.Type.GetType("System.String"));
        DataRow dr1 = dt.NewRow();
        dr1[0] = "1";
        dr1[1] = "sss";
        dr1[2] = "sdfs";
        DataRow dr2 = dt.NewRow();
        dr2[0] = "2";
        dr2[1] = "sede";
        dr2[2] = "lj";

        DataRow dr3 = dt.NewRow();
        dr3[0] = "3";
        dr3[1] = "sfd";
        dr3[2] = "dlo";
        dt.Rows.Add(dr1);
        dt.Rows.Add(dr2);
        dt.Rows.Add(dr3);

        return dt;
    }

 public void test3()
    {
        DataTable tempDataTable = CreatTable();
        Excel.Application m_xlApp = new Excel.Application();
        m_xlApp.DisplayAlerts = false;
        m_xlApp.Visible = false;
        Excel.Workbooks workbooks = m_xlApp.Workbooks;
        Excel.Workbook workbook = workbooks.Add(Excel.XlWBATemplate.xlWBATWorksheet);
        Excel.Worksheet worksheet = (Excel.Worksheet)workbook.Worksheets[1];
        try
        {
            for (int sc = 1; sc < 4; sc++)
            {
                if (sc > 1)
                {
                    object missing = System.Reflection.Missing.Value;
                    worksheet = (Excel.Worksheet)workbook.Worksheets.Add(missing, missing, missing, missing);
                }
                else
                {
                    worksheet = (Excel.Worksheet)workbook.Worksheets[sc];

                }
                worksheet.Name = tempDataTable.Columns[sc - 1].ColumnName;
                string[,] datas = new string[4, 3];
                for (int i = 0; i < 3; i++)
                {
                    datas[0, i] = tempDataTable.Columns[i].Caption;
                }
                Excel.Range range = worksheet.get_Range(worksheet.Cells[1, 1], worksheet.Cells[1, 3]);

                range.Interior.ColorIndex = 15;
                range.Font.Bold = true;
                range.Font.Size = 9;
                for (int r = 0; r < 3; r++)
                {
                    for (int k = 0; k < 3; k++)
                    {
                        object obj = tempDataTable.Rows[r][tempDataTable.Columns[k].ToString()];
                        datas[r + 1, k] = obj == null ? "" : "'" + obj.ToString().Trim();
                    }
                }
                Excel.Range fchR = worksheet.get_Range(worksheet.Cells[1, 1], worksheet.Cells[4, 3]);
                fchR.Value2 = datas;
                worksheet.Columns.EntireColumn.AutoFit();
                m_xlApp.WindowState = Excel.XlWindowState.xlMaximized;

                fchR.Font.Size = 9;
                fchR.RowHeight = 14.25;
                fchR.Borders.LineStyle = 1;
                fchR.HorizontalAlignment = 1;
            }
            workbook.Saved = true;
            string filepath = Server.MapPath(DateTime.Now.ToString("yyyyMMddhhmmss") + ".xls");
            object ob = System.Reflection.Missing.Value;
            workbook.SaveAs(filepath, Excel.XlFileFormat.xlExcel7, ob, ob, ob, ob, Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlNoChange, ob, ob, ob, ob, ob);

            m_xlApp.Quit();
            GC.Collect();//强行销毁
            System.Diagnostics.Process.Start(filepath); //打开EXCEL 

        }
        catch (Exception ex)
        {

        }
    }

    public void test2()
    {
        DataTable dt2 = CreatTable();
        DataTable dt = CreatTable();
        Excel.Application excel1;
        Excel._Workbook xworkbook;
        Excel._Worksheet xworksheek;
        excel1 = new Excel.ApplicationClass();
        xworkbook = excel1.Workbooks.Add(true);
        xworksheek = (Excel._Worksheet)excel1.ActiveSheet;
        xworksheek.Name = "testone";

        int i = 0;
        foreach (DataColumn col in dt.Columns)
        {
            i++;
            excel1.Cells[1, i] = col.ColumnName;
            xworksheek.get_Range(excel1.Cells[1, i], excel1.Cells[1, i]).Font.Bold = true;
            xworksheek.get_Range(excel1.Cells[1, i], excel1.Cells[1, i]).HorizontalAlignment = Excel.XlVAlign.xlVAlignCenter;
            xworksheek.get_Range(excel1.Cells[1, i], excel1.Cells[1, i]).Select();
            xworksheek.get_Range(excel1.Cells[1, i], excel1.Cells[1, i]).Interior.ColorIndex = 3;
            xworksheek.get_Range(excel1.Cells[1, i], excel1.Cells[1, i]).Columns.AutoFit();
        }

        int j = 1;
        foreach (DataRow dr in dt.Rows)
        {
            j++;
            for (int k = 0; k < i; k++)
            {
                excel1.Cells[j, k + 1] = dr[k].ToString();
                xworksheek.get_Range(excel1.Cells[j, k + 1], excel1.Cells[j, k + 1]).HorizontalAlignment = Excel.XlVAlign.xlVAlignCenter;
                xworksheek.get_Range(excel1.Cells[j, k + 1], excel1.Cells[j, k + 1]).Select();

            }
        }

        foreach (DataColumn col in dt2.Columns)
        {
            i = 0;
            Excel._Worksheet wks;
            wks = (Excel._Worksheet)excel1.ActiveSheet;
            wks.Name = col.ColumnName;
            foreach (DataColumn col2 in dt2.Columns)
            {
                i++;
                excel1.Cells[1, i] = col2.ColumnName;
                wks.get_Range(excel1.Cells[1, i], excel1.Cells[1, i]).Font.Bold = true;
                wks.get_Range(excel1.Cells[1, i], excel1.Cells[1, i]).HorizontalAlignment = Excel.XlVAlign.xlVAlignCenter;
                wks.get_Range(excel1.Cells[1, i], excel1.Cells[1, i]).Select();
                wks.get_Range(excel1.Cells[1, i], excel1.Cells[1, i]).Interior.ColorIndex = 3;
                wks.get_Range(excel1.Cells[1, i], excel1.Cells[1, i]).Columns.AutoFit();
            }
        }
        excel1.Cells[5, 1] = "标题";
        xworksheek.get_Range(excel1.Cells[5, 1], excel1.Cells[5, 3]).Select();
        //string FilePath = ;
        string filepath = Server.MapPath(DateTime.Now.ToString("yyyyMMddhhmmss") + ".xls");
        excel1.ActiveWorkbook.SaveAs(filepath, Excel.XlFileFormat.xlExcel9795, null, null, false, false, Excel.XlSaveAsAccessMode.xlNoChange, null, null, null, null, null);
        xworkbook.Close(null, null, null);
        excel1.Workbooks.Close();
        excel1.Quit();

            //注意：这里用到的所有Excel对象都要执行这个操作，否则结束不了Excel进程
        if (xworksheek != null)
        {
            System.Runtime.InteropServices.Marshal.ReleaseComObject(xworksheek);
            xworksheek = null;
        }
        if (xworkbook != null)
        {
            System.Runtime.InteropServices.Marshal.ReleaseComObject(xworkbook);
            xworkbook = null;
        }
        if (excel1 != null)
        {
            System.Runtime.InteropServices.Marshal.ReleaseComObject(excel1);
            excel1 = null;
        }
        GC.Collect();

    }