DataSet數據導出爲Excel文檔（每一個DataTable爲一個Sheet）

Web項目中，不少時候需要實現將查詢的數據集導出爲Excel文檔的功能，不少時候不但願在工程中添加對Office組件相關的DLL的引用，甚至有時候受到Office不一樣版本的影響，致使在不一樣的服務器上部署後功能受限，或和其它項目衝突，那麼，使用這種簡單粗暴的方式，可能會解決部分猿類靈長動物的煩惱憂愁。

/// <summary>
/// DataSet導出到Excel文件（多個Sheet）
/// </summary>
/// <param name="dataSet">DataSet</param>
/// <param name="fileName">文件名稱</param>
/// <returns>導出是否成功</returns>
public static bool DataSetToExcel(DataSet dataSet, string fileName)
{
    if (dataSet == null) return false;
    if (dataSet.Tables.Count < 1) return false;
    if (dataSet.Tables[0] == null) return false;
    if (string.IsNullOrWhiteSpace(fileName)) return false;
    try
    {
        ExecDataSetToExcel(dataSet, fileName);
        return true;
    }
    catch (Exception ex)
    {
        //DO LOG
        return false;
    }
}

//執行 DataSet 導出
private static void ExecDataSetToExcel(DataSet dataSet, string fileName)
{
    HttpResponse httpResponse = HttpContext.Current.Response;
    httpResponse.Clear();
    httpResponse.Charset = "utf-8";
    httpResponse.ContentType = "text/xml";
    httpResponse.ContentEncoding = System.Text.Encoding.UTF8;
    httpResponse.AppendHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(fileName, Encoding.UTF8) + ".xls");

    StringBuilder sb = new StringBuilder();
    for (int i = 0; i < dataSet.Tables.Count; i++)
    {
        System.Data.DataTable dt = dataSet.Tables[i];
        //新建Sheet
        string sheetName = string.IsNullOrWhiteSpace(dt.TableName) ? "Sheet" + (i + 1) : dt.TableName;
        sb.Append("<Worksheet ss:Name='" + sheetName + "'>");
        sb.Append("<Table x:FullColumns='1' x:FullRows='1' ss:DefaultColumnWidth='118'>");
        //輸出標題行
        sb.Append("<Row ss:AutoFitHeight='1'>");
        for (int j = 0; j < dt.Columns.Count; j++) sb.Append("<Cell ss:StyleID='header'><Data ss:Type='String'>" + dt.Columns[j].ColumnName + "</Data></Cell>");
        sb.Append("</Row>");
        //輸入內容行
        for (int k = 0; k < dt.Rows.Count; k++)
        {
            sb.Append("<Row>");
            for (int l = 0; l < dt.Columns.Count; l++)
            {
                //Type ct = dt.Columns[l].DataType;
                //sb.Append("<Cell ss:StyleID='body'><Data ss:Type='Number'>" + dt.Rows[k][l] + "</Data></Cell>"); //數字類型
                sb.Append("<Cell ss:StyleID='body'><Data ss:Type='String'>" + dt.Rows[k][l] + "</Data></Cell>");
            }
            sb.Append("</Row>");
        }
        sb.Append("</Table>");
        sb.Append("</Worksheet>");
    }

    string excelXmlDoc = CreateExcelXmlDoc(sb.ToString());
    httpResponse.Write(excelXmlDoc);
    httpResponse.Flush();
    httpResponse.End();
}

//建立Excel文檔對應的XML字符串
private static string CreateExcelXmlDoc(string worksheetXml)
{
    StringBuilder sb = new StringBuilder();
    sb.Append("<?xml version='1.0'?><?mso-application progid='Excel.Sheet'?>");
    sb.Append("<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'>");
    //文檔屬性
    sb.Append("<DocumentProperties xmlns='urn:schemas-microsoft-com:office:office'>"
        + "<Author>Unitech</Author><LastAuthor>Unitech</LastAuthor><Created></Created><LastSaved></LastSaved><Version>12.00</Version>"
        + "</DocumentProperties>");
    //樣式
    sb.Append("<Styles>");
    sb.Append("<Style ss:ID='header'>"
        + "<Font ss:FontName='宋體' x:CharSet='134' ss:Size='10' ss:Color='#000000' ss:Bold='0'/>"
        + "<Alignment ss:Horizontal='Center' ss:Vertical='Center'/>"
        + "<Interior ss:Color='#d8d8d8' ss:Pattern='Solid'/>"
        + "<Borders>"
        + "<Border ss:Position='Bottom' ss:LineStyle='Continuous' ss:Weight='1' ss:Color='#bfbfbf'/>"
        + "<Border ss:Position='Left' ss:LineStyle='Continuous' ss:Weight='1' ss:Color='#bfbfbf'/>"
        + "<Border ss:Position='Right' ss:LineStyle='Continuous' ss:Weight='1' ss:Color='#bfbfbf'/>"
        + "<Border ss:Position='Top' ss:LineStyle='Continuous' ss:Weight='1' ss:Color='#bfbfbf'/>"
        + "</Borders></Style>");
    sb.Append("<Style ss:ID='body'>"
        + "<Font ss:FontName='宋體' x:CharSet='134' ss:Size='10' ss:Color='#000000'/>"
        + "<Alignment ss:Vertical='Center'/>"
        + "<NumberFormat ss:Format='@'/>"
        + "<Borders>"
        + "<Border ss:Position='Bottom' ss:LineStyle='Continuous' ss:Weight='1' ss:Color='#bfbfbf'/>"
        + "<Border ss:Position='Left' ss:LineStyle='Continuous' ss:Weight='1' ss:Color='#bfbfbf'/>"
        + "<Border ss:Position='Right' ss:LineStyle='Continuous' ss:Weight='1' ss:Color='#bfbfbf'/>"
        + "<Border ss:Position='Top' ss:LineStyle='Continuous' ss:Weight='1' ss:Color='#bfbfbf'/>"
        + "</Borders></Style>");
    sb.Append("</Styles>");
    //Work Sheet
    sb.Append(worksheetXml);
    sb.Append("</Workbook>");
    return sb.ToString();
}

有須要的拿去本身進行改進和優化吧。