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性能方面没有测试，部分可随使用情况修改，如果情况允许建议使用网上开源的excel导入导出的组件
using System; using System.Collections.Generic; using System.Text; using System.Data; using System.IO; using System.Web; using Microsoft.Office.Interop.Excel;//选用第一种导出方法需要加载程序集扩展DLL using System.Reflection; namespace YS.CommonHelper { public class ExcelExport { private ExcelExport() { } private static ExcelExport _instance = null; public static ExcelExport Instance { get { if (_instance == null) _instance = new ExcelExport(); return _instance; } } /// <summary> /// DataTable直接导出Excel,此方法会把DataTable的数据用Excel打开,再自己手动去保存到确切的位置 /// </summary> /// <param name="dt">要导出Excel的DataTable</param> /// <returns></returns> public bool DoExport(DataTable dt) { Application app = new ApplicationClass(); if (app == null) { throw new Exception("Excel无法启动"); } app.Visible = true; Workbooks wbs = app.Workbooks; Workbook wb = wbs.Add(Missing.Value); Worksheet ws = (Worksheet)wb.Worksheets[1]; int cnt = dt.Rows.Count; int columncnt = dt.Columns.Count; // *****************获取数据******************** object[,] objData = new Object[cnt + 1, columncnt]; // 创建缓存数据 // 获取列标题 for (int i = 0; i < columncnt; i++) { objData[0, i] = dt.Columns[i].ColumnName; } // 获取具体数据 for (int i = 0; i < cnt; i++) { System.Data.DataRow dr = dt.Rows[i]; for (int j = 0; j < columncnt; j++) { objData[i + 1, j] = dr[j]; } } //********************* 写入Excel****************** Range r = ws.get_Range(app.Cells[1, 1], app.Cells[cnt + 1, columncnt]); r.NumberFormat = "@"; //r = r.get_Resize(cnt+1, columncnt); r.Value2 = objData; r.EntireColumn.AutoFit(); app = null; return true; } /// <summary> /// DataTable通过流导出Excel /// </summary> /// <param name="ds">数据源DataSet</param> /// <param name="columns">DataTable中列对应的列名(可以是中文),若为null则取DataTable中的字段名</param> /// <param name="fileName">保存文件名(例如：a.xls)</param> /// <returns></returns> public bool StreamExport(DataTable dt, string[] columns, string fileName, System.Web.UI.Page pages) { if (dt.Rows.Count > 65535) //总行数大于Excel的行数 { throw new Exception("预导出的数据总行数大于excel的行数"); } if (string.IsNullOrEmpty(fileName)) return false; StringBuilder content = new StringBuilder(); StringBuilder strtitle = new StringBuilder(); content.Append("<html xmlns:o=‘urn:schemas-microsoft-com:office:office‘ xmlns:x=‘urn:schemas-microsoft-com:office:excel‘ xmlns=‘http://www.w3.org/TR/REC-html40‘>"); content.Append("<head><title></title><meta http-equiv=‘Content-Type‘ content=\"text/html; charset=gb2312\">"); //注意：[if gte mso 9]到[endif]之间的代码，用于显示Excel的网格线，若不想显示Excel的网格线，可以去掉此代码 content.Append("<!--[if gte mso 9]>"); content.Append("<xml>"); content.Append(" <x:ExcelWorkbook>"); content.Append(" <x:ExcelWorksheets>"); content.Append(" <x:ExcelWorksheet>"); content.Append(" <x:Name>Sheet1</x:Name>"); content.Append(" <x:WorksheetOptions>"); content.Append(" <x:Print>"); content.Append(" <x:ValidPrinterInfo />"); content.Append(" </x:Print>"); content.Append(" </x:WorksheetOptions>"); content.Append(" </x:ExcelWorksheet>"); content.Append(" </x:ExcelWorksheets>"); content.Append("</x:ExcelWorkbook>"); content.Append("</xml>"); content.Append("<![endif]-->"); content.Append("</head><body><table style=‘border-collapse:collapse;table-layout:fixed;‘><tr>"); if (columns != null) { for (int i = 0; i < columns.Length; i++) { if (columns[i] != null && columns[i] != "") { content.Append("<td><b>" + columns[i] + "</b></td>"); } else { content.Append("<td><b>" + dt.Columns[i].ColumnName + "</b></td>"); } } } else { for (int j = 0; j < dt.Columns.Count; j++) { content.Append("<td><b>" + dt.Columns[j].ColumnName + "</b></td>"); } } content.Append("</tr>\n"); for (int j = 0; j < dt.Rows.Count; j++) { content.Append("<tr>"); for (int k = 0; k < dt.Columns.Count; k++) { object obj = dt.Rows[j][k]; Type type = obj.GetType(); if (type.Name == "Int32" || type.Name == "Single" || type.Name == "Double" || type.Name == "Decimal") { double d = obj == DBNull.Value ? 0.0d : Convert.ToDouble(obj); if (type.Name == "Int32" || (d - Math.Truncate(d) == 0)) content.AppendFormat("<td style=‘vnd.ms-excel.numberformat:#,##0‘>{0}</td>", obj); else content.AppendFormat("<td style=‘vnd.ms-excel.numberformat:#,##0.00‘>{0}</td>", obj); } else content.AppendFormat("<td style=‘vnd.ms-excel.numberformat:@‘>{0}</td>", obj); } content.Append("</tr>\n"); } content.Append("</table></body></html>"); content.Replace(" ", ""); pages.Response.Clear(); pages.Response.Buffer = true; pages.Response.ContentType = "application/ms-excel"; //"application/ms-excel"; pages.Response.Charset = "UTF-8"; pages.Response.ContentEncoding = System.Text.Encoding.UTF7; fileName = System.Web.HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8); pages.Response.AppendHeader("Content-Disposition", "attachment; filename=" + fileName); pages.Response.Write(content.ToString()); //pages.Response.End(); //注意，若使用此代码结束响应可能会出现“由于代码已经过优化或者本机框架位于调用堆栈之上,无法计算表达式的值。”的异常。 HttpContext.Current.ApplicationInstance.CompleteRequest(); //用此行代码代替上一行代码，则不会出现上面所说的异常。 return true; } /// <summary> /// 直接由GridView导出Excel /// </summary> /// <param name="ctl">控件(一般是GridView)</param> /// <param name="FileName">导出的文件名</param> /// <param name="removeIndexs">要移除的列的索引数组(因为有时我们并不希望把GridView中的所有列全部导出)</param> /// <param name="pages"></param> public void ControlToExcel(System.Web.UI.WebControls.GridView ctl, string FileName, string[] removeIndexs, System.Web.UI.Page pages) { if (removeIndexs != null) { foreach (string index in removeIndexs) { ctl.Columns[int.Parse(index)].Visible = false; } } pages.Response.Charset = "GB2312"; pages.Response.ContentEncoding = System.Text.Encoding.UTF8;//注意编码 pages.Response.ContentType = "application/ms-excel"; FileName = System.Web.HttpUtility.UrlEncode(FileName, System.Text.Encoding.UTF8); pages.Response.AppendHeader("Content-Disposition", "attachment;filename=" + "" + FileName); ctl.EnableViewState = false; System.IO.StringWriter tw = new System.IO.StringWriter(); System.Web.UI.HtmlTextWriter hw = new System.Web.UI.HtmlTextWriter(tw); ctl.RenderControl(hw); pages.Response.Write(tw.ToString()); HttpContext.Current.ApplicationInstance.CompleteRequest(); } } }
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原文地址：http://www.cnblogs.com/yangsoon/p/4469268.html
