读取文件夹下所有文件名，饼写入xml

 DirectoryInfo dinfo = new DirectoryInfo(Server.MapPath("~/etao/item/"));
        FileInfo[] files = dinfo.GetFiles("*.xml");  //读取item文件夹下所有文件名

        FileInfo file = new FileInfo(Server.MapPath("~/etao/FullIndex.xml"));
        XmlTextWriter textWriter = new XmlTextWriter(Server.MapPath("~/etao/FullIndex.xml"), Encoding.UTF8);
        textWriter.WriteStartDocument();
        textWriter.WriteStartElement("root");

        textWriter.WriteElementString("version", "1.0");
        textWriter.WriteElementString("modified", DateTime.Now.ToString());
        textWriter.WriteElementString("seller_id", "官网");
        textWriter.WriteElementString("cat_url", config.PayUrl + "etao/SellerCats.xml");
        textWriter.WriteElementString("dir", config.PayUrl + "etao/item/");
        textWriter.WriteStartElement("item_ids");

        foreach (System.IO.FileInfo fi in files)
        {
            textWriter.WriteStartElement("outer_id");
            textWriter.WriteStartAttribute("action");
            textWriter.WriteString("upload");
            textWriter.WriteEndAttribute();
            textWriter.WriteString(fi.Name.Replace(".xml",""));
            textWriter.WriteEndElement();
        }

        textWriter.WriteEndElement();

        textWriter.WriteEndDocument();
        textWriter.Close();

写入xml后：

 <?xml version="1.0" encoding="utf-8" ?> 
- <root>
  <version>1.0</version> 
  <modified>2011-7-11 15:25:46</modified> 
  <seller_id>官网</seller_id> 
  <cat_url>http:///etao/SellerCats.xml</cat_url> 
  <dir>http:///etao/item/</dir> 
- <item_ids>
  <outer_id action="upload">ID1000018289</outer_id> 
  <outer_id action="upload">ID1000018292</outer_id> 
  <outer_id action="upload">ID1000018294</outer_id> 
  <outer_id action="upload">ID1000018298</outer_id> 
  <outer_id action="upload">ID1000018299</outer_id> 
  <outer_id action="upload">ID1000018303</outer_id> 
  <outer_id action="upload">ID1000018305</outer_id> 
  <outer_id action="upload">ID1000018309</outer_id> 
  <outer_id action="upload">ID1000018412</outer_id> 
  <outer_id action="upload">ID1000018413</outer_id> 
  <outer_id action="upload">ID1000018452</outer_id> 
  </item_ids>
  </root>