c#DataTableToExcel方法
最简单的XML格式Excel表格文件
当然，还有几个地方是可以删除掉的内容，但是这样就有些破坏完整性了。这个文档的作用就是从XML数据源中导出数据之后，使用XSLT转换也可以把数据导出。简单！
<?xml version="1.0"?> <?mso-application progid="Excel.Sheet"?> <Workbook xmlns="urn:schemas-microsoft-com:office:spreadsheet" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:x="urn:schemas-microsoft-com:office:excel" xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet" xmlns:html="http://www.w3.org/TR/REC-html40"> <DocumentProperties xmlns="urn:schemas-microsoft-com:office:office"> <Title>Excel表格</Title> <LastAuthor>bigtall</LastAuthor> </DocumentProperties> <Styles> <Style ss:ID="Default" ss:Name="Normal"> <Alignment ss:Vertical="Center"/> <Font ss:FontName="宋体" x:CharSet="134" ss:Size="12"/> </Style> </Styles> <Worksheet ss:Name="tt"> <Table> <Row> <Cell ss:MergeAcross="6" ><Data ss:Type="String">Hello!World!</Data></Cell> </Row> </Table> </Worksheet> </Workbook>
其实还可以精简到这样：
<?xml version="1.0"?> <?mso-application progid="Excel.Sheet"?> <Workbook xmlns="urn:schemas-microsoft-com:office:spreadsheet" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:x="urn:schemas-microsoft-com:office:excel" xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet" xmlns:html="http://www.w3.org/TR/REC-html40"> <Worksheet ss:Name="tt"> <Table> <Row> <Cell><Data ss:Type="String">Hello!World!</Data></Cell> </Row> </Table> </Worksheet> </Workbook>
导出excel方法：
/// <summary>
/// DataTable通过流导出Excel
/// </summary>
/// <param name="ds">数据源DataSet或者DataTable</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 static bool StreamExport(DataTable dt, ArrayList 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:ss='urn:schemas-microsoft-com:office:spreadsheet' 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.Count; 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.GetEncoding("GB2312");
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;
}
