关于ASP.NET 将数据导出成Excel 的总结[下]

 

使用ExcelHelper 封装类，将DataSet 输出成Excel文件的多个Sheet 页。

 

使用代码如下：

public partial class _Default : System.Web.UI.Page

    {

        protected void Page_Load(object sender, EventArgs e)

        {

            btn.Click += new EventHandler(btn_Click);

            Button1.Click += new EventHandler(Button1_Click);

        }



        void Button1_Click(object sender, EventArgs e)

        {

            var ds = new DataSet();

            var dt = new DataTable("TableName For Sheet1");

            dt.Columns.Add("col1");

            dt.Columns.Add("col2");

            dt.Rows.Add("Value1", "Value2");



            var dt2 = new DataTable("TableName For Sheet2");

            dt2.Columns.Add("col1");

            dt2.Columns.Add("col2");

            dt2.Rows.Add("Value1", "Value2");

            ds.Tables.Add(dt);

            ds.Tables.Add(dt2);

            ExcelHelper.ToExcel(ds, "test.xls", Page.Response);           

        }



        void btn_Click(object sender, EventArgs e)

        {

            var ds = new DataSet();

            DataTable dt = new DataTable();

            dt.Columns.Add("col");

            ds.Tables.Add(dt);

            ExcelHelper.ToExcel(ds, "test.xls", Page.Response);

        }      

    }

ExcelHelper.cs 封装类，源代码如下：

//ExcelHelper.cs



public class ExcelHelper

{

    //Row limits older Excel version per sheet

        const int rowLimit = 65000;



        private static string getWorkbookTemplate()

        {

            var sb = new StringBuilder();

            sb.Append("<xml version>\r\n<Workbook

        xmlns=\"urn:schemas-microsoft-com:office:spreadsheet\"\r\n");

            sb.Append(" xmlns:o=\"urn:schemas-microsoft-com:office:office\"\r\n

        xmlns:x=\"urn:schemas- microsoft-com:office:excel\"\r\n

        xmlns:ss=\"urn:schemas-microsoft-com:office:spreadsheet\">\r\n");

            sb.Append(" <Styles>\r\n

        <Style ss:ID=\"Default\" ss:Name=\"Normal\">\r\n

        <Alignment ss:Vertical=\"Bottom\"/>\r\n <Borders/>");

            sb.Append("\r\n <Font/>\r\n <Interior/>\r\n <NumberFormat/>\r\n

        <Protection/>\r\n </Style>\r\n

        <Style ss:ID=\"BoldColumn\">\r\n <Font ");

            sb.Append("x:Family=\"Swiss\" ss:Bold=\"1\"/>\r\n </Style>\r\n

        <Style ss:ID=\"s62\">\r\n <NumberFormat");

            sb.Append(" ss:Format=\"@\"/>\r\n </Style>\r\n

        <Style ss:ID=\"Decimal\">\r\n

        <NumberFormat ss:Format=\"0.0000\"/>\r\n </Style>\r\n ");

            sb.Append("<Style ss:ID=\"Integer\">\r\n

        <NumberFormat ss:Format=\"0\"/>\r\n </Style>\r\n

        <Style ss:ID=\"DateLiteral\">\r\n <NumberFormat ");

            sb.Append("ss:Format=\"mm/dd/yyyy;@\"/>\r\n </Style>\r\n

        <Style ss:ID=\"s28\">\r\n");

            sb.Append("<Alignment ss:Horizontal=\"Left\" ss:Vertical=\"Top\"

        ss:ReadingOrder=\"LeftToRight\" ss:WrapText=\"1\"/>\r\n");

            sb.Append("<Font x:CharSet=\"1\" ss:Size=\"9\"

        ss:Color=\"#808080\" ss:Underline=\"Single\"/>\r\n");

            sb.Append("<Interior ss:Color=\"#FFFFFF\" ss:Pattern=\"Solid\"/>



        </Style>\r\n</Styles>\r\n {0}</Workbook>");

            return sb.ToString();

        }



        private static string replaceXmlChar(string input)

        {

            input = input.Replace("&", "&");

            input = input.Replace("<", "<");

            input = input.Replace(">", ">");

            input = input.Replace("\"", """);

            input = input.Replace("'", "'");

            return input;

        }



        private static string getWorksheets(DataSet source)

        {

            var sw = new StringWriter();

            if (source == null || source.Tables.Count == 0)

            {

                sw.Write("<Worksheet ss:Name=\"Sheet1\"><Table><Row>



        <Cell  ss:StyleID=\"s62\"><Data ss:Type=\"String\"></Data>

        </Cell></Row></Table></Worksheet>");

                return sw.ToString();

            }

            foreach (DataTable dt in source.Tables)

            {

                if (dt.Rows.Count == 0)

                    sw.Write("<Worksheet ss:Name=\"" + replaceXmlChar(dt.TableName) +

            "\"><Table><Row><Cell  ss:StyleID=\"s62\">



            <Data ss:Type=\"String\"></Data></Cell></Row>

            </Table></Worksheet>");

                else

                {

                    //write each row data

                    var sheetCount = 0;

                    for (int i = 0; i < dt.Rows.Count; i++)

                    {

                        if ((i % rowLimit) == 0)

                        {

                            //add close tags for previous sheet of the same data table

                            if ((i / rowLimit) > sheetCount)

                            {

                                sw.Write("</Table></Worksheet>");

                                sheetCount = (i / rowLimit);

                            }

                            sw.Write("<Worksheet ss:Name=\"" +

                replaceXmlChar(dt.TableName) +

                                     (((i / rowLimit) == 0) ? "" :

                Convert.ToString(i / rowLimit)) + "\"><Table>");

                            //write column name row

                            sw.Write("<Row>");

                            foreach (DataColumn dc in dt.Columns)

                                sw.Write(

                                    string.Format(

                                        "<Cell ss:StyleID=\"BoldColumn\">



                <Data ss:Type=\"String\">{0}</Data></Cell>",

                                        replaceXmlChar(dc.ColumnName)));

                            sw.Write("</Row>\r\n");

                        }

                        sw.Write("<Row>\r\n");

                        foreach (DataColumn dc in dt.Columns)

                            sw.Write(

                                string.Format(

                                    "<Cell ss:StyleID=\"s62\"><Data ss:Type=\"String\">



                    {0}</Data></Cell>",

                                            replaceXmlChar

                    (dt.Rows[i][dc.ColumnName].ToString())));

                        sw.Write("</Row>\r\n");

                    }

                    sw.Write("</Table></Worksheet>");

                }

            }



            return sw.ToString();

        }

        public static string GetExcelXml(DataTable dtInput, string filename)

        {

            var excelTemplate = getWorkbookTemplate();

            var ds = new DataSet();

            ds.Tables.Add(dtInput.Copy());

            var worksheets = getWorksheets(ds);

            var excelXml = string.Format(excelTemplate, worksheets);

            return excelXml;

        }



        public static string GetExcelXml(DataSet dsInput, string filename)

        {

            var excelTemplate = getWorkbookTemplate();

            var worksheets = getWorksheets(dsInput);

            var excelXml = string.Format(excelTemplate, worksheets);

            return excelXml;

        }



        public static void ToExcel

        (DataSet dsInput, string filename, HttpResponse response)

        {

            var excelXml = GetExcelXml(dsInput, filename);

            response.Clear();

            response.AppendHeader("Content-Type", "application/vnd.ms-excel");

            response.AppendHeader

        ("Content-disposition", "attachment; filename=" + filename);

            response.Write(excelXml);

            response.Flush();

            response.End();

        }



        public static void ToExcel

        (DataTable dtInput, string filename, HttpResponse response)

        {

            var ds = new DataSet();

            ds.Tables.Add(dtInput.Copy());

            ToExcel(ds, filename, response);

        }

    }

来源：http://www.codeproject.com/KB/office/ExportDataSetToExcel.aspx

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