c# DataTable 针对xml、excel、csv导入和导出

using System;
using 
System.Collections.Generic;
using System.Linq;
using System.Web;
using 
System.Web.UI;
using System.Web.UI.WebControls;
using 
System.Data.SqlClient;
using System.Data;
using System.Xml;
using 
System.Xml.Xsl;
using System.IO;
using System.Data.OleDb;
using 
System.Data.Odbc;
using System.Text;
using Excel = 
Microsoft.Office.Interop.Excel;
 

namespace fantest
{
 public partial class 
_Default : System.Web.UI.Page
 {
 protected void 
Page_Load(object sender, EventArgs e)
 {
 
Bind();
 }
 protected void Bind()
 
{
 this.GridView1.DataSource = this.GetDataTable();
 
this.GridView1.DataBind();
 }
 private DataTable 
GetDataTable()
 {
 DataSet ds = new 
DataSet();
 using (SqlConnection conn = new 
SqlConnection("server=.;uid=sa;pwd=123456;database=test"))
 
{
 string sql = "select * from InfoTable where 
1=1";
 SqlDataAdapter dap = new SqlDataAdapter(sql, 
conn);
 dap.Fill(ds,"InfoTable");
 
}
 return ds.Tables["InfoTable"];
 }
 //TO 
XML
 protected void Button1_Click(object sender, EventArgs 
e)
 {
 DataTable dt = 
this.GetDataTable();
 StringBuilder sb = new 
StringBuilder();
 sb.Append("<" + dt.TableName + 
">");
 foreach (DataRow row in dt.Rows)
 
{
 sb.Append("<item>");
 
for (int i = 0; i < dt.Columns.Count; 
i++)
 {
 sb.Append("<" + 
dt.Columns[i].ColumnName + ">" + row[i].ToString() + "</" + 
dt.Columns[i].ColumnName + ">");
 }
 

sb.Append("</item>");
 }
 sb.Append("</" + 
dt.TableName + ">");
 Response.ClearHeaders();
 
Response.AppendHeader("Content-Disposition", "attachment; 
filename=ss.xml");
 Response.ContentType = 
"text/csv";
 Response.Write(sb.ToString());
 
Response.End();
 }
 //FROM XML
 protected void 
Button2_Click(object sender, EventArgs e)
 { 

string filepath = Server.MapPath("ss.xml");
 if 
(!File.Exists(filepath))
 {
 
Page.RegisterClientScriptBlock("msg", 
"<script>alert('该文件不存在！')</script>");
 
}
 else
 {
 StringReader 
StrStream = null;
 XmlTextReader Xmlrdr = 
null;
 try
 {
 
XmlDocument xmldoc = new XmlDocument();
 
xmldoc.Load(filepath);
 DataSet ds = new 
DataSet();
 ds.ReadXml(new XmlTextReader(new 
StringReader(xmldoc.InnerXml)));
 
this.GridView2.DataSource = ds.Tables[0];
 
this.GridView2.DataBind();
 }
 catch 
(Exception ex)
 {
 throw 
ex;
 }
 finally
 
{
 if (Xmlrdr != null)
 
{
 Xmlrdr.Close();
 
StrStream.Close();
 
StrStream.Dispose();
 }
 
}
 }
 }
 //TO EXCEL
 protected void 
Button3_Click(object sender, EventArgs e)
 {
 
//Response.Charset = "GB2312";
 //Response.ContentEncoding = 
System.Text.Encoding.UTF7;
 
//Response.AppendHeader("Content-Disposition", "attachment;filename=" + 
HttpUtility.UrlEncode("ss.xls", Encoding.UTF8).ToString());
 
//Response.ContentType = "application/vnd.ms-excel";
 
//this.EnableViewState = false;
 //StringWriter tw = new 
StringWriter();
 //HtmlTextWriter hw = new 
HtmlTextWriter(tw);
 
//this.GridView1.RenderControl(hw);
 
//Response.Write(tw.ToString());
 //Response.End(); 



//上面注释的代码是一种以流的方式导入excel的，当数据在从此excel读取时会报一个异常，如果要对excel写入和读取最好用下面一种方式
 
DataTable dt = 
this.GetDataTable();
 string filepath = 
HttpContext.Current.Server.MapPath("ss.xls");
 
Excel.Application xlApp = new Excel.Application(); 

Excel.Workbooks w= xlApp.Workbooks; 

Excel.Workbook workbook = 
w.Add(Excel.XlWBATemplate.xlWBATWorksheet);
 Excel.Worksheet 
worksheet = (Excel.Worksheet)workbook.Worksheets[1];
 //写入字段 

for (int i = 0; i < dt.Columns.Count; 
i++)
 {
 worksheet.Cells[1, i + 1] = 
dt.Columns[i].ColumnName;
 }
 //写入数值 

for (int r = 0; r < dt.Rows.Count; 
r++)
 {
 for (int i = 0; i < 
dt.Columns.Count; i++)
 {
 
worksheet.Cells[r + 2, i + 1] = dt.Rows[r][i];
 
}
 }
 
worksheet.Columns.EntireColumn.AutoFit();//列宽自适应。
 
workbook.Saved = true;
 
workbook.SaveCopyAs(filepath);
 
xlApp.Quit();

 GC.Collect();//强行销毁 

HttpContext.Current.Response.Buffer = true;
 
HttpContext.Current.Response.Clear();
 
HttpContext.Current.Response.ContentType = 
"application/ms-excel";
 
HttpContext.Current.Response.AddHeader("Content-Disposition", 
"attachment;filename=" + HttpUtility.UrlEncode(filepath));
 
HttpContext.Current.Response.WriteFile(filepath);
 
HttpContext.Current.Response.Flush();
 
HttpContext.Current.Response.End();
 }
 //FROM 
EXCEL
 protected void Button4_Click(object sender, EventArgs 
e)
 {
 //Office 2007 连接字符串
 //string 
strConn = "Provider=Microsoft.Ace.OleDb.12.0;" + "Data Source=" + @path + ";" + 
"Extended Properties=Excel 12.0;"
 //Office 98-2003 
连接字符串(此示例使用2003) 
string filepath = 
Server.MapPath("ss.xls");
 if 
(!File.Exists(filepath))
 {
 
Page.RegisterClientScriptBlock("msg", 
"<script>alert('该文件不存在！')</script>");
 
}
 else
 {
 string strConn = 
"Provider=Microsoft.Jet.OleDb.4.0;" + "data source=" + filepath + ";Extended 
Properties='Excel 8.0; HDR=YES; IMEX=1'";
 OleDbConnection 
conn = new OleDbConnection(strConn);
 OleDbDataAdapter odda = 
new OleDbDataAdapter("select * from [Sheet1$]", conn);
 
DataSet ds = new DataSet();
 odda.Fill(ds);
 
this.GridView2.DataSource = ds.Tables[0];
 
this.GridView2.DataBind();
 }
 }
 //TO 
CSV
 protected void Button5_Click(object sender, EventArgs 
e)
 {
 DataTable dt = 
this.GetDataTable();
 
HttpContext.Current.Response.Clear();
 System.IO.StringWriter sw = 
new System.IO.StringWriter();
 int iColCount = 
dt.Columns.Count;
 for (int i = 0; i < iColCount; 
i++)
 {
 sw.Write("\"" + dt.Columns[i] + 
"\"");
 if (i < iColCount - 1)
 
{
 sw.Write(",");
 }
 
}
 sw.Write(sw.NewLine);
 foreach (DataRow dr in 
dt.Rows)
 {
 for (int i = 0; i < iColCount; 
i++)
 {
 if 
(!Convert.IsDBNull(dr[i]))
 sw.Write("\"" + 
dr[i].ToString() + "\"");
 else
 
sw.Write("\"\"");
 
if (i < iColCount - 
1)
 {
 
sw.Write(",");
 }
 }
 
sw.Write(sw.NewLine);
 }
 sw.Close();
 
HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment; 
filename=ss.csv");
 HttpContext.Current.Response.ContentType = 
"application/vnd.ms-excel";
 
HttpContext.Current.Response.ContentEncoding = 
System.Text.Encoding.GetEncoding("GB2312");
 
HttpContext.Current.Response.Write(sw);
 
HttpContext.Current.Response.End();
 }
 //FROM 
CSV
 protected void Button6_Click(object sender, EventArgs 
e)
 { 
string filepath = 
Server.MapPath("ss.csv");
 if 
(!File.Exists(filepath))
 {
 
Page.RegisterClientScriptBlock("msg", 
"<script>alert('该文件不存在！')</script>");
 
}
 else
 
{
 string strConn = @"Driver={Microsoft Text Driver 
(*.txt; *.csv)};Dbq=";
 strConn += 
";Extensions=asc,csv,tab,txt;";
 OdbcConnection 
objConn = new OdbcConnection(strConn);
 DataSet ds = 
new DataSet();
 try
 
{
 string strSql = "select * from " + 
filepath;
 OdbcDataAdapter odbcCSVDataAdapter = 
new OdbcDataAdapter(strSql, objConn);
 
odbcCSVDataAdapter.Fill(ds);
 
this.GridView2.DataSource = ds.Tables[0];
 
this.GridView2.DataBind();
 
}
 catch (Exception ex)
 
{
 throw ex;
 
}
 }
 }
 }
}

 此段代码是针对DataTable 对xml、excel、csv 
对文件的导入和导出功能，记录一下，以供以后使用。 一定要导入excel 并添加引用Microsoft.Office.Interop.Excel 
11.0版本。 Default.aspx.cs文件 Default.aspx文件: <%@ Page Language="C#" EnableEventValidation = 
"false" AutoEventWireup="true" CodeBehind="Default.aspx.cs" 
Inherits="fantest._Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 
1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" 
>
<head runat="server">
 
<title></title>
</head>
<body >
 <form 
id="form1" runat="server">
 <asp:GridView ID="GridView1" 
runat="server">
 </asp:GridView>
 <asp:GridView 
ID="GridView2" runat="server">
 </asp:GridView>
 
<asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="toxml" 
/>
 <asp:Button ID="Button2" runat="server" 
onclick="Button2_Click" 
Text="from xml" />
 
<asp:Button ID="Button3" runat="server" onclick="Button3_Click" 

Text="toexcel" />
 <asp:Button ID="Button4" 
runat="server" onclick="Button4_Click" 
Text="fromexcel" 
/>
 <asp:Button ID="Button5" runat="server" 
onclick="Button5_Click" Text="tocsv" />
 <asp:Button 
ID="Button6" runat="server" onclick="Button6_Click" 

Text="fromcsv" />
 

</form>
</body>
</html>