C#中写入Excel

using System;
using System.Collections.Generic;
using System.Text;
using System.Web;
using System.Data;
namespace Common.BaseClass
{
public class FileExport
{
#region 导出文件为 Excel文件 文本格式
/// <summary>
/// 导出文件为 Excel文件
/// </summary>
/// <param name="dt">数据集</param>
/// <param name="FileName">导出文件名称</param>
/// <param name="headers">列名</param>
/// <param name="remark">备注</param>
public void CreateExcel(DataTable dt, string FileName, string[] headers, string[] remark)
{

HttpResponse resp;
resp = HttpContext.Current.Response;
resp.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
resp.AppendHeader("Content-Disposition", "attachment;filename=" + FileName);
//标题 内容
string colHeaders = "", ls_item = "";
int i = 0;

DataRow[] myRow = dt.Select("");
for (i = 0; i < remark.Length; i++)
{
colHeaders += remark[i] + "\n";
}
//取得数据表各列标题，各标题之间以\t分割，最后一个列标题后加回车符
for (i = 0; i < headers.Length; i++)
{
colHeaders += headers[i] + "\t";
}
colHeaders += "\n";
//向HTTP输出流中写入取得的数据信息
resp.Write(colHeaders);
//逐行处理数据
foreach (DataRow row in myRow)
{
//在当前行中，逐列获得数据，数据之间以\t分割，结束时加回车符\n
for (i = 0; i < dt.Columns.Count; i++)
{
ls_item += row[i].ToString() + "\t";
//当前行数据写入HTTP输出流，并且置空ls_item以便下行数据
}
ls_item += "\n";
resp.Write(ls_item);
ls_item = "";
}

//写缓冲区中的数据到HTTP头文件中
resp.End();
}
#endregion
/// <summary>
/// 将Dataset中的表导出到Excel中
/// </summary>
/// <param name="source">源数据集</param>
/// <param name="fileName">保存的文件名</param>
/// <param name="title">标题</param>
/// <param name="headers">列名</param>
/// <param name="explain">文件生成说明</param>
/// <param name="ps">注释</param>
public static void ExportToExcel(DataTable source, string fileName, string[] headers, string title, string explain,string []ps)
{
HttpResponse resp;
resp = HttpContext.Current.Response;
resp.ContentEncoding = System.Text.Encoding.GetEncoding("utf-8");
resp.AppendHeader("Content-Disposition", "attachment;filename=" + fileName);


string startExcelXML = @"<?xml version=""1.0"" encoding=""utf-8""?>
<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"">
<Styles>
<Style ss:ID=""Default"" ss:Name=""Normal"">
<Alignment ss:Horizontal=""Center"" ss:Vertical=""Center""/>
<Font/>
<Interior/>
<NumberFormat/>
<Protection/>
</Style>
<Style ss:ID=""BoldColumn"">
<Borders>
<Border ss:Position=""Bottom"" ss:LineStyle=""Continuous"" ss:Weight=""1""/>
<Border ss:Position=""Left"" ss:LineStyle=""Continuous"" ss:Weight=""1""/>
<Border ss:Position=""Right"" ss:LineStyle=""Continuous"" ss:Weight=""1""/>
<Border ss:Position=""Top"" ss:LineStyle=""Continuous"" ss:Weight=""1""/>
</Borders>
<Font ss:FontName=""宋体"" ss:Bold=""1"" x:CharSet=""134"" ss:Size=""12"" />
<Interior ss:Color=""#D2EAF6"" ss:Pattern=""Solid""/>
</Style>
<Style ss:ID=""StringLiteral"">
<NumberFormat ss:Format=""@""/>
<Borders>
<Border ss:Position=""Bottom"" ss:LineStyle=""Continuous"" ss:Weight=""1""/>
<Border ss:Position=""Left"" ss:LineStyle=""Continuous"" ss:Weight=""1""/>
<Border ss:Position=""Right"" ss:LineStyle=""Continuous"" ss:Weight=""1""/>
<Border ss:Position=""Top"" ss:LineStyle=""Continuous"" ss:Weight=""1""/>
</Borders>
<Font ss:FontName=""宋体"" x:CharSet=""134"" ss:Size=""12"" />
</Style>
<Style ss:ID=""Decimal"">
<NumberFormat ss:Format=""0.00""/>
<Borders>
<Border ss:Position=""Bottom"" ss:LineStyle=""Continuous"" ss:Weight=""1""/>
<Border ss:Position=""Left"" ss:LineStyle=""Continuous"" ss:Weight=""1""/>
<Border ss:Position=""Right"" ss:LineStyle=""Continuous"" ss:Weight=""1""/>
<Border ss:Position=""Top"" ss:LineStyle=""Continuous"" ss:Weight=""1""/>
</Borders>
<Font ss:FontName=""宋体"" x:CharSet=""134"" ss:Size=""12"" />
</Style>
<Style ss:ID=""Integer"">
<NumberFormat ss:Format=""0""/>
<Borders>
<Border ss:Position=""Bottom"" ss:LineStyle=""Continuous"" ss:Weight=""1""/>
<Border ss:Position=""Left"" ss:LineStyle=""Continuous"" ss:Weight=""1""/>
<Border ss:Position=""Right"" ss:LineStyle=""Continuous"" ss:Weight=""1""/>
<Border ss:Position=""Top"" ss:LineStyle=""Continuous"" ss:Weight=""1""/>
</Borders>
<Font ss:FontName=""宋体"" x:CharSet=""134"" ss:Size=""12"" />
</Style>
<Style ss:ID=""DateLiteral"">
<NumberFormat ss:Format=""yyyy-MM-dd HH:mm;@""/>
<Borders>
<Border ss:Position=""Bottom"" ss:LineStyle=""Continuous"" ss:Weight=""1""/>
<Border ss:Position=""Left"" ss:LineStyle=""Continuous"" ss:Weight=""1""/>
<Border ss:Position=""Right"" ss:LineStyle=""Continuous"" ss:Weight=""1""/>
<Border ss:Position=""Top"" ss:LineStyle=""Continuous"" ss:Weight=""1""/>
</Borders>
<Font ss:FontName=""宋体"" x:CharSet=""134"" ss:Size=""12"" />
</Style>
<Style ss:ID=""ps""><!--注释-->
<Alignment ss:Horizontal=""Left"" ss:Vertical=""Center""/>
<Font ss:FontName=""宋体"" x:CharSet=""134""/>
<Interior ss:Color=""#FFFFCC"" ss:Pattern=""Solid""/>
</Style>
<Style ss:ID=""explain""><!--说明:数据跟据什么而来-->
<Alignment ss:Horizontal=""Left"" ss:Vertical=""Center""/>
<Borders>
<Border ss:Position=""Bottom"" ss:LineStyle=""Continuous"" ss:Weight=""1""/>
<Border ss:Position=""Top"" ss:LineStyle=""Continuous"" ss:Weight=""1""/>
</Borders>
<Font ss:FontName=""宋体"" x:CharSet=""134"" ss:Size=""12""/>
</Style>
<Style ss:ID=""Title""><!--大标题-->
<Alignment ss:Horizontal=""Center"" ss:Vertical=""Center""/>
<Borders>
<Border ss:Position=""Bottom"" ss:LineStyle=""Continuous"" ss:Weight=""1""/>
</Borders>
<Font ss:FontName=""宋体"" x:CharSet=""134"" ss:Size=""16"" ss:Bold=""1""/>
</Style>
</Styles>";
string endExcelXML = "\r\n</Workbook>";

int rowCount = 0;
int sheetCount = 0;
resp.Write(startExcelXML);
sheetCount++;
resp.Write("\r\n<Worksheet ss:Name=\"" + title + "\">");
resp.Write("\r\n<Table>");

//写标题
resp.Write("\r\n<Row>\r\n<Cell ss:MergeAcross=\"" + (source.Columns.Count - 1) + "\" ss:StyleID=\"Title\"><Data ss:Type=\"String\">" + title + "</Data></Cell>\t\t\t\r\n</Row>");
//写数据来源
resp.Write("\r\n<Row>\r\n<Cell ss:MergeAcross=\"" + (source.Columns.Count - 1) + "\" ss:StyleID=\"explain\"><Data ss:Type=\"String\">" + explain + "</Data></Cell>\r\n</Row>");

resp.Write("\r\n<Row>");
//得到数据集有多少列
//for (int x = 0; x < source.Columns.Count; x++)
//{
// resp.Write("<Cell ss:StyleID=\"BoldColumn\"><Data ss:Type=\"String\">");
// resp.Write(source.Columns[x].ColumnName);
// resp.Write("</Data></Cell>");
//}//New 自己定义列名
for (int x = 0; x < headers.Length; x++)
{
resp.Write("\r\n<Cell ss:StyleID=\"BoldColumn\"><Data ss:Type=\"String\">");
resp.Write(headers[x]);
resp.Write("</Data></Cell>");
}
resp.Write("</Row>");

//便历出数据集中的每一行数据
foreach (DataRow x in source.Rows)
{
rowCount++;
//如果行数超过　陆万肆仟行,则新起一页
if (rowCount == 64000)
{
rowCount = 0;
sheetCount++;
resp.Write("\r\n</Table>");
resp.Write(" \r\n</Worksheet>");
resp.Write("\r\n<Worksheet ss:Name=\"" + source.TableName + sheetCount + "\">");
resp.Write("\r\n<Table>");
}

resp.Write("\r\n<Row>"); //ID=" + rowCount + "

for (int y = 0; y < source.Columns.Count; y++)
{
System.Type rowType;
//获得将要写入数据的数据类型
rowType = x[y].GetType();
switch (rowType.ToString())
{
case "System.String":
string XMLstring = x[y].ToString();
XMLstring = XMLstring.Trim();
XMLstring = XMLstring.Replace("&", "&");
XMLstring = XMLstring.Replace(">", ">");
XMLstring = XMLstring.Replace("<", "<");
resp.Write("\r\n<Cell ss:StyleID=\"StringLiteral\">" +
"<Data ss:Type=\"String\">");
resp.Write(XMLstring);
resp.Write("</Data></Cell>");
break;
case "System.DateTime":
//Excel has a specific Date Format of YYYY-MM-DD followed by
//the letter 'T' then hh:mm:sss.lll Example 2005-01-31T24:01:21.000
//The Following Code puts the date stored in XMLDate
//to the format above
DateTime XMLDate = (DateTime)x[y];
string XMLDatetoString = ""; //Excel Converted Date
XMLDatetoString = XMLDate.Year.ToString() +
"-" +
(XMLDate.Month < 10 ? "0" +
XMLDate.Month.ToString() : XMLDate.Month.ToString()) +
"-" +
(XMLDate.Day < 10 ? "0" +
XMLDate.Day.ToString() : XMLDate.Day.ToString()) +
"T" +
(XMLDate.Hour < 10 ? "0" +
XMLDate.Hour.ToString() : XMLDate.Hour.ToString()) +
":" +
(XMLDate.Minute < 10 ? "0" +
XMLDate.Minute.ToString() : XMLDate.Minute.ToString()) +
":" +
(XMLDate.Second < 10 ? "0" +
XMLDate.Second.ToString() : XMLDate.Second.ToString()) +
".000";
resp.Write("\r\n<Cell ss:StyleID=\"DateLiteral\">" +
"<Data ss:Type=\"DateTime\">");
resp.Write(XMLDatetoString);
resp.Write("</Data></Cell>");
break;
case "System.Boolean":
resp.Write("\r\n<Cell ss:StyleID=\"StringLiteral\">" +
"<Data ss:Type=\"String\">");
resp.Write(x[y].ToString());
resp.Write("</Data></Cell>");
break;
case "System.Int16":
case "System.Int32":
case "System.Int64":
case "System.Byte":
resp.Write("\r\n<Cell ss:StyleID=\"Integer\">" +
"<Data ss:Type=\"Number\">");
resp.Write(x[y].ToString());
resp.Write("</Data></Cell>");
break;
case "System.Decimal":
case "System.Double":
resp.Write("\r\n<Cell ss:StyleID=\"Decimal\">" +
"<Data ss:Type=\"Number\">");
resp.Write(x[y].ToString());
resp.Write("</Data></Cell>");
break;
case "System.DBNull":
resp.Write("\r\n<Cell ss:StyleID=\"StringLiteral\">" +
"<Data ss:Type=\"String\">");
resp.Write("");
resp.Write("</Data></Cell>");
break;
default:
throw (new Exception(rowType.ToString() + " not handled."));
}
}
resp.Write("\r\n</Row>");
}
//注释
foreach (string str in ps)
{
resp.Write("\r\n<Row>\r\n<Cell ss:MergeAcross=\"" + (source.Columns.Count - 1) + "\" ss:StyleID=\"ps\"><Data ss:Type=\"String\">" + str + "</Data></Cell>\r\n</Row>");
}
resp.Write("\r\n</Table>");
resp.Write("\r\n</Worksheet>");

resp.Write(endExcelXML);

resp.End();
}
}
}