C#导出Excel cvs数据

using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.Windows.Forms;
using System.IO;

namespace TopAPI
{
class ExcelCreate
{

public void CreateCsv(System.Data.DataTable dt, string strName)
{



//先打印标头
StringBuilder strColu=new StringBuilder();
StringBuilder strValue=new StringBuilder();
int i=0;

try
{
StreamWriter sw = new StreamWriter(new FileStream(strName+".csv", FileMode.Create), Encoding.GetEncoding("GB2312"));

for( i=0;i<=dt.Columns.Count-1;i++)
{
strColu.Append("/""+dt.Columns[i].ColumnName+"/"");
strColu.Append(","); }
strColu.Remove(strColu.Length-1,1);//移出掉最后一个,字符

sw.WriteLine(strColu);

foreach(DataRow dr in dt.Rows)
{
strValue.Remove(0,strValue.Length);//移出

for(i=0;i<=dt.Columns.Count-1;i++) {
strValue.Append("/""+dr[i].ToString().Replace("'","''").Replace (",","，")+"/"");
strValue.Append(",");
}
strValue.Remove(strValue.Length-1,1);//移出掉最后一个,字符
sw.WriteLine(strValue);
}

sw.Close();
}
catch(Exception ex)
{
MessageBox.Show(ex.Message);

}

}

public void CreateExcel(DataTable source, string fileName)
{

System.IO.StreamWriter excelDoc;
excelDoc = new System.IO.StreamWriter(fileName);
const string startExcelXML = @"<xml version> <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:Vertical=/"Bottom/"/> <Borders/>" +
" <Font/> <Interior/> <NumberFormat/>" +
" <Protection/> </Style> " +
"<Style ss:ID=/"BoldColumn/"> <Font " +
"x:Family=/"Swiss/" ss:Bold=/"1/"/> </Style> " +
"<Style ss:ID=/"StringLiteral/"> <NumberFormat" +
" ss:Format=/"@/"/> </Style> <Style " +
"ss:ID=/"Decimal/"> <NumberFormat " +
"ss:Format=/"0.0000/"/> </Style> " +
"<Style ss:ID=/"Integer/"> <NumberFormat " +
"ss:Format=/"0/"/> </Style> <Style " +
"ss:ID=/"DateLiteral/"> <NumberFormat " +
"ss:Format=/"mm/dd/yyyy;@/"/> </Style> " +
"</Styles> ";
const string endExcelXML = "</Workbook>";

int rowCount = 0;
int sheetCount = 1;

excelDoc.Write(startExcelXML);
excelDoc.Write("<Worksheet ss:Name=/"Sheet" + sheetCount + "/">");
excelDoc.Write("<Table>");
excelDoc.Write("<Row>");
for (int x = 0; x < source.Columns.Count; x++)
{
excelDoc.Write("<Cell ss:StyleID=/"BoldColumn/"><Data ss:Type=/"String/">");
excelDoc.Write(source.Columns[x].ColumnName);
excelDoc.Write("</Data></Cell>");
}
excelDoc.Write("</Row>");
foreach (DataRow x in source.Rows)
{
rowCount++;
//if the number of rows is > 64000 create a new page to continue output
if (rowCount == 64000)
{
rowCount = 0;
sheetCount++;
excelDoc.Write("</Table>");
excelDoc.Write(" </Worksheet>");
excelDoc.Write("<Worksheet ss:Name=/"Sheet" + sheetCount + "/">");
excelDoc.Write("<Table>");
}
excelDoc.Write("<Row>"); //ID=" + rowCount + "
for (int y = 0; y < source.Columns.Count; y++)
{
System.Type rowType;
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("<", "<");
excelDoc.Write("<Cell ss:StyleID=/"StringLiteral/">" +
"<Data ss:Type=/"String/">");
excelDoc.Write(XMLstring);
excelDoc.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";
excelDoc.Write("<Cell ss:StyleID=/"DateLiteral/">" +
"<Data ss:Type=/"DateTime/">");
excelDoc.Write(XMLDatetoString);
excelDoc.Write("</Data></Cell>");
break;
case "System.Boolean":
excelDoc.Write("<Cell ss:StyleID=/"StringLiteral/">" +
"<Data ss:Type=/"String/">");
excelDoc.Write(x[y].ToString());
excelDoc.Write("</Data></Cell>");
break;
case "System.Int16":
case "System.Int32":
case "System.Int64":
case "System.Byte":
excelDoc.Write("<Cell ss:StyleID=/"Integer/">" +
"<Data ss:Type=/"Number/">");
excelDoc.Write(x[y].ToString());
excelDoc.Write("</Data></Cell>");
break;
case "System.Decimal":
case "System.Double":
excelDoc.Write("<Cell ss:StyleID=/"Decimal/">" +
"<Data ss:Type=/"Number/">");
excelDoc.Write(x[y].ToString());
excelDoc.Write("</Data></Cell>");
break;
case "System.DBNull":
excelDoc.Write("<Cell ss:StyleID=/"StringLiteral/">" +
"<Data ss:Type=/"String/">");
excelDoc.Write("");
excelDoc.Write("</Data></Cell>");
break;
default:
throw (new Exception(rowType.ToString() + " not handled."));
}
}
excelDoc.Write("</Row>");
}
excelDoc.Write("</Table>");
excelDoc.Write(" </Worksheet>");
excelDoc.Write(endExcelXML);
excelDoc.Close();
}
}
}