C#DataTableToExcel方法

2015/10/10 C#

** 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。 

<?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("&nbsp;", "");
    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;
}

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