100分送上：DataTable导入Excel有关问题

asp.net里导出excel表方法汇总   2006-5-23    1、由dataset生成 public void CreateExcel(DataSet ds,string typeid,string FileName)     {    HttpResponse resp;    resp = Page.Response;    resp.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");    resp.AppendHeader("Content-Disposition", "attachment;filename=" + FileName);       string colHeaders= "", ls_item="";    int i=0;    //定义表对象与行对像，同时用DataSet对其值进行初始化    DataTable dt=ds.Tables[0];    DataRow[] myRow=dt.Select("");     // typeid=="1"时导出为EXCEL格式文件；typeid=="2"时导出为XML格式文件    if(typeid=="1")     {     //取得数据表各列标题，各标题之间以\t分割，最后一个列标题后加回车符     for(i=0;i     colHeaders+=dt.Columns[i].Caption.ToString()+"\t";     colHeaders +=dt.Columns[i].Caption.ToString() +"\n";        //向HTTP输出流中写入取得的数据信息     resp.Write(colHeaders);      //逐行处理数据       foreach(DataRow row in myRow)      {      //在当前行中，逐列获得数据，数据之间以\t分割，结束时加回车符\n      for(i=0;i      ls_item +=row[i].ToString() + "\t";           ls_item += row[i].ToString() +"\n";      //当前行数据写入HTTP输出流，并且置空ls_item以便下行数据          resp.Write(ls_item);      ls_item="";     }    }    else     {     if(typeid=="2")      {       //从DataSet中直接导出XML数据并且写到HTTP输出流中      resp.Write(ds.GetXml());     }        }    //写缓冲区中的数据到HTTP头文件中    resp.End();   } 2、由datagrid生成 public void ToExcel(System.Web.UI.Control ctl)      {    HttpContext.Current.Response.AppendHeader("Content-Disposition","attachment;filename=Excel.xls");    HttpContext.Current.Response.Charset ="UTF-8";        HttpContext.Current.Response.ContentEncoding =System.Text.Encoding.Default;    HttpContext.Current.Response.ContentType ="application/ms-excel";//image/JPEG;text/HTML;image/GIF;vnd.ms-excel/msword    ctl.Page.EnableViewState =false;       System.IO.StringWriter  tw = new System.IO.StringWriter() ;    System.Web.UI.HtmlTextWriter hw = new System.Web.UI.HtmlTextWriter (tw);    ctl.RenderControl(hw);    HttpContext.Current.Response.Write(tw.ToString());    HttpContext.Current.Response.End();   } 用法：ToExcel(datagrid1); 3、这个用dataview public void OutputExcel(DataView dv,string str) {    //    // TODO: 在此处添加构造函数逻辑    //                            //dv为要输出到Excel的数据，str为标题名称    GC.Collect();    Application excel;// = new Application();    int rowIndex=4;    int colIndex=1;    _Workbook xBk;    _Worksheet xSt;    excel= new ApplicationClass();       xBk = excel.Workbooks.Add(true);        xSt = (_Worksheet)xBk.ActiveSheet;    //    //取得标题    //    foreach(DataColumn col in dv.Table.Columns)     {     colIndex++;     excel.Cells[4,colIndex] = col.ColumnName;     xSt.get_Range(excel.Cells[4,colIndex],excel.Cells[4,colIndex]).HorizontalAlignment = XlVAlign.xlVAlignCenter;//设置标题格式为居中对齐    }    //    //取得表格中的数据    //    foreach(DataRowView row in dv)     {     rowIndex ++;     colIndex = 1;     foreach(DataColumn col in dv.Table.Columns)      {      colIndex ++;      if(col.DataType == System.Type.GetType("System.DateTime"))       {       excel.Cells[rowIndex,colIndex] = (Convert.ToDateTime(row[col.ColumnName].ToString())).ToString("yyyy-MM-dd");       xSt.get_Range(excel.Cells[rowIndex,colIndex],excel.Cells[rowIndex,colIndex]).HorizontalAlignment = XlVAlign.xlVAlignCenter;//设置日期型的字段格式为居中对齐      }      else       if(col.DataType == System.Type.GetType("System.String"))       {       excel.Cells[rowIndex,colIndex] = "'"+row[col.ColumnName].ToString();       xSt.get_Range(excel.Cells[rowIndex,colIndex],excel.Cells[rowIndex,colIndex]).HorizontalAlignment = XlVAlign.xlVAlignCenter;//设置字符型的字段格式为居中对齐      }      else       {       excel.Cells[rowIndex,colIndex] = row[col.ColumnName].ToString();      }     }    }    //    //加载一个合计行    //    int rowSum = rowIndex + 1;    int colSum = 2;    excel.Cells[rowSum,2] = "合计";    xSt.get_Range(excel.Cells[rowSum,2],excel.Cells[rowSum,2]).HorizontalAlignment = XlHAlign.xlHAlignCenter;    //    //设置选中的部分的颜色    //    xSt.get_Range(excel.Cells[rowSum,colSum],excel.Cells[rowSum,colIndex]).Select();    xSt.get_Range(excel.Cells[rowSum,colSum],excel.Cells[rowSum,colIndex]).Interior.ColorIndex = 19;//设置为浅黄色，共计有56种    //    //取得整个报表的标题    //    excel.Cells[2,2] = str;    //    //设置整个报表的标题格式    //    xSt.get_Range(excel.Cells[2,2],excel.Cells[2,2]).Font.Bold = true;    xSt.get_Range(excel.Cells[2,2],excel.Cells[2,2]).Font.Size = 22;    //    //设置报表表格为最适应宽度    //    xSt.get_Range(excel.Cells[4,2],excel.Cells[rowSum,colIndex]).Select();    xSt.get_Range(excel.Cells[4,2],excel.Cells[rowSum,colIndex]).Columns.AutoFit();    //    //设置整个报表的标题为跨列居中    //    xSt.get_Range(excel.Cells[2,2],excel.Cells[2,colIndex]).Select();    xSt.get_Range(excel.Cells[2,2],excel.Cells[2,colIndex]).HorizontalAlignment = XlHAlign.xlHAlignCenterAcrossSelection;    //    //绘制边框    //    xSt.get_Range(excel.Cells[4,2],excel.Cells[rowSum,colIndex]).Borders.LineStyle = 1;    xSt.get_Range(excel.Cells[4,2],excel.Cells[rowSum,2]).Borders[XlBordersIndex.xlEdgeLeft].Weight = XlBorderWeight.xlThick;//设置左边线加粗    xSt.get_Range(excel.Cells[4,2],excel.Cells[4,colIndex]).Borders[XlBordersIndex.xlEdgeTop].Weight = XlBorderWeight.xlThick;//设置上边线加粗    xSt.get_Range(excel.Cells[4,colIndex],excel.Cells[rowSum,colIndex]).Borders[XlBordersIndex.xlEdgeRight].Weight = XlBorderWeight.xlThick;//设置右边线加粗    xSt.get_Range(excel.Cells[rowSum,2],excel.Cells[rowSum,colIndex]).Borders[XlBordersIndex.xlEdgeBottom].Weight = XlBorderWeight.xlThick;//设置下边线加粗    //    //显示效果    //    excel.Visible=true;    //xSt.Export(Server.MapPath(".")+"\\"+this.xlfile.Text+".xls",SheetExportActionEnum.ssExportActionNone,Microsoft.Office.Interop.OWC.SheetExportFormat.ssExportHTML);    xBk.SaveCopyAs(Server.MapPath(".")+"\\"+this.xlfile.Text+".xls");    ds = null;             xBk.Close(false, null,null);                 excel.Quit();             System.Runtime.InteropServices.Marshal.ReleaseComObject(xBk);             System.Runtime.InteropServices.Marshal.ReleaseComObject(excel);     System.Runtime.InteropServices.Marshal.ReleaseComObject(xSt);             xBk = null;             excel = null;    xSt = null;             GC.Collect();    string path = Server.MapPath(this.xlfile.Text+".xls");    System.IO.FileInfo file = new System.IO.FileInfo(path);    Response.Clear();    Response.Charset="GB2312";    Response.ContentEncoding=System.Text.Encoding.UTF8;    // 添加头信息，为"文件下载/另存为"对话框指定默认文件名    Response.AddHeader("Content-Disposition", "attachment; filename=" + Server.UrlEncode(file.Name));    // 添加头信息，指定文件大小，让浏览器能够显示下载进度    Response.AddHeader("Content-Length", file.Length.ToString());        // 指定返回的是一个不能被客户端读取的流，必须被下载    Response.ContentType = "application/ms-excel";        // 把文件流发送到客户端    Response.WriteFile(file.FullName);    // 停止页面的执行       Response.End(); }