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XML声明

<?xml version="1.0" encoding="GB2312" standalone="no"?> <标记 属性名＝"属性取值"…>数据内容</标记>DataSet方法DataSet.ReadXml(string strFileName);

DataSet.WriteXml(string  strFileName);

dbGuest.xsd

dbGuest.xml

<?xml version="1.0" standalone="yes"?>

<dbGuest xmlns="">

  <User>

    <Name>gloomyboyo</Name>

    <City>fuzhou</City>

    <Email>gloomyboyo@126.com</Email>

    <Message>Hello!</Message>

    <STime>2006-8-5 10:51:14</STime>

  </User>

</dbGuest>

  private void btnSubmit_Click(object sender, System.EventArgs e)

  {

   DataSet ds = new DataSet("myDs");

   //从XML中读取数据

   ds.ReadXml(Server.MapPath(@"./db/dbGuest.xml"));

   //以下为添加记录

   DataRow dr = ds.Tables[0].NewRow();

   dr["Name"] = tbName.Text.Trim();

   dr["City"] = tbCity.Text.Trim();

   dr["Email"] = tbEmail.Text.Trim();

   dr["Message"] = tbComments.Text.Trim();

   dr["STime"] = DateTime.Now.ToString();

   ds.Tables[0].Rows.Add(dr);

   //写回XML

   ds.WriteXml(Server.MapPath(".//db//dbGuest.xml"));

   Response.Redirect("view.aspx");

  }

  private void Page_Load(object sender, System.EventArgs e)

  {

//显示数据

   DataSet ds = new DataSet();

   ds.ReadXml(Server.MapPath(@"./db/dbGuest.xml"));

   dgShow.DataSource = ds.Tables[0].DefaultView;

   dgShow.DataBind();

  }

XMl文件的读写

foreach(XmlNode personElement in root.ChildNodes)XmlTextWriter的使用

people.xml<?xml version="1.0" encoding="utf-8" ?>  <PEOPLE>    <PERSON>张三</PERSON>    <PERSON>李四</PERSON>  </PEOPLE>   private void LoadXMLButton_Click(object sender, System.EventArgs e)  {    // 创建XmlDocument类的实例   XmlDocument doc = new XmlDocument();   ArrayList NodeValues = new ArrayList();   // 把people.xml文件读入内存，形成一个DOM结构   doc.Load( Server.MapPath("people.xml") );   XmlNode root = doc.DocumentElement;   foreach( XmlNode personElement in root.ChildNodes )

    NodeValues.Add(personElement.FirstChild.Value);   XMLNodeListBox.DataSource = NodeValues;   XMLNodeListBox.DataBind();  }  static void WriteXMLbyXmlWriter(XmlWriter writer, string symbol, double price, double change, long volume)  {    writer.WriteStartElement("Stock");   writer.WriteAttributeString("Symbol", symbol);   writer.WriteElementString("Price", XmlConvert.ToString(price));   writer.WriteElementString("Change", XmlConvert.ToString(change));   writer.WriteElementString("Volume", XmlConvert.ToString(volume));   writer.WriteEndElement();  }  private void CreateXMLFileButton_Click(object sender, System.EventArgs e)  {    // 创建一个表示所要生成的XML文件路径的字符串。如果该路径指向NTFS分区，则需要相关的访问权限。

   string filename = XMLFilePathTextBox.Text;   // 创建一个写入XML数据的文件流   System.IO.FileStream myFileStream = new System.IO.FileStream(filename, System.IO.FileMode.Create);   // 使用文件流对象创建一个XmlTextWriter对象   XmlTextWriter myXmlWriter = new XmlTextWriter(myFileStream, System.Text.Encoding.Unicode);   myXmlWriter.Formatting = Formatting.Indented;   try   {     // 使用WriteXMLbyXmlWriter方法把数据写入XmlTextWriter对象中    WriteXMLbyXmlWriter(myXmlWriter, "MSFT", 74.5, 5.5, 49020000);    // 通过Close方法的调用，XmlTextWriter对象的数据最终写入XML文件    myXmlWriter.Close();    Page.Response.Write("生成XML文档成功!");   }   catch   {     Page.Response.Write("生成XML文档失败!请检查路径是否正确，以及是否有写入权限。");   }  }

 

Xml的文件操作

XmlDocument的使用：.Load.SelectSingleNode.CreateElement.SavedbGuest.xml<?xml version="1.0" standalone="yes"?><dbGuest>  <User>  </User>  <User>    <Name>gloomyboyo</Name>    <City>fuzhou</City>    <Email>gloomyboyo@126.com</Email>  </User></dbGuest>  private void Page_Load(object sender, System.EventArgs e)  {    if(!IsPostBack)   Bind();  }  private void Bind()  {    DataSet ds = new DataSet();   ds.ReadXml(Server.MapPath(".//db//dbGuest.xml"));   dgShow.DataSource = ds.Tables[0].DefaultView;   dgShow.DataBind();   XmlDocument doc = new XmlDocument();   doc.Load(Server.MapPath(".//db//dbGuest.xml"));   XmlNodeList elemList = doc.GetElementsByTagName("Name");   ddlName.Items.Clear();   for(int i=0;i<elemList.Count;i++)    ddlName.Items.Add(elemList[i].InnerXml);  }  private void btnQuery_Click(object sender, System.EventArgs e)  { //查询   XmlDocument doc = new XmlDocument();   doc.Load(Server.MapPath(".//db//dbGuest.xml"));      lbEmail.Text = doc.SelectSingleNode("//User[Name='"+ddlName.SelectedItem.Text+"']").ChildNodes.Item(2).InnerText;         }  private void btnDelete_Click(object sender, System.EventArgs e)  { //删除   XmlDocument xmlDoc = new XmlDocument();   xmlDoc.Load(Server.MapPath(".//db//dbGuest.xml"));   XmlNodeList xnl=xmlDoc.SelectSingleNode("dbGuest").ChildNodes;   foreach(XmlNode xn in xnl)   {     XmlElement xe=(XmlElement)xn;    XmlNodeList node = xe.GetElementsByTagName("Name");    if(node.Count>0)    {      if(node[0].InnerText==ddlName.SelectedItem.Text)      xe.RemoveAll();//删除该节点的全部内容     break;    }   }   xmlDoc.Save(Server.MapPath(".//db//dbGuest.xml"));   Bind();  }  private void btnAdd_Click(object sender, System.EventArgs e)  { //添加   XmlDocument xmlDoc = new XmlDocument();   xmlDoc.Load(Server.MapPath(".//db//dbGuest.xml"));   XmlNode root=xmlDoc.SelectSingleNode("dbGuest");//查找<dbGuest>   XmlElement xe1=xmlDoc.CreateElement("User");//创建一个<User>节点   XmlElement xesub1=xmlDoc.CreateElement("Name");   xesub1.InnerText="Guset";//设置文本节点   xe1.AppendChild(xesub1);//添加到<User>节点中

   XmlElement xesub2=xmlDoc.CreateElement("City");   xesub2.InnerText="上海";   xe1.AppendChild(xesub2);   XmlElement xesub3=xmlDoc.CreateElement("Email");   xesub3.InnerText="";   xe1.AppendChild(xesub3);    root.AppendChild(xe1);//添加到<dbGuest>节点中

   xmlDoc.Save(Server.MapPath(".//db//dbGuest.xml"));   Bind();  }  private void btnChange_Click(object sender, System.EventArgs e)  { //查询   XmlDocument xmlDoc = new XmlDocument();   xmlDoc.Load(Server.MapPath(".//db//dbGuest.xml"));   XmlNodeList nodeList=xmlDoc.SelectSingleNode("dbGuest").ChildNodes;//获取dbGuest节点的所有子节点   foreach(XmlNode xn in nodeList)//遍历所有子节点   {     XmlElement xe=(XmlElement)xn;//将子节点类型转换为XmlElement类型    XmlNodeList node = xe.GetElementsByTagName("Name");    if(node.Count>0)    {      if(node[0].InnerText==ddlName.SelectedItem.Text)     {       XmlNodeList nls=xe.ChildNodes;//继续获取xe子节点的所有子节点

      foreach(XmlNode xn1 in nls)//遍历      {        XmlElement xe2=(XmlElement)xn1;//转换类型       if(xe2.Name=="Email")//如果找到       {         xe2.InnerText=tbNewMail.Text;//则修改        break;//找到退出来就可以了       }      }      break;     }    }      }   xmlDoc.Save(Server.MapPath(".//db//dbGuest.xml"));   Bind();  }

XMl文件验证

  private void Page_Load(object sender, System.EventArgs e)  {    FileStream stream = new FileStream(Server.MapPath("people.xml"), FileMode.Open);   //创建XmlValidatingReader类的对象   XmlValidatingReader vr = new XmlValidatingReader(stream, XmlNodeType.Element, null);   //加载XML架构文档   vr.Schemas.Add(null, Server.MapPath("people.xsd"));   //说明验证的方式是根据XML架构   vr.ValidationType = ValidationType.Schema;   vr.ValidationEventHandler += new ValidationEventHandler(ValidationHandler);   //对文档进行验证   while(vr.Read());   //显示验证过程完成   Page.Response.Write("<b>Validation finished!<b>");   //关闭打开的文件   stream.Close();  }  private void ValidationHandler(object sender, ValidationEventArgs args)  {    //显示验证失败的消息   Page.Response.Write("<b>Validation error: </b>" + args.Message + "<p>");  }

Xml传送图片

XmlDocument类的使用Byte[] bt=new Byte[size];String strData;把字节组转换为字符串：－String str=Convert.ToBase64String(bt);把字符串转换为字符串－bt=Convert.FromBase64String(strData);  private void btnUpload_Click(object sender, System.EventArgs e)  {    //得到用户要上传的文件名   string strFilePathName = loFile.PostedFile.FileName;   string strFileName = Path.GetFileName(strFilePathName);   int FileLength = loFile.PostedFile.ContentLength;   if(FileLength<=0)    return;   try   {     Byte[] FileByteArray = new Byte[FileLength]; //图象文件临时储存Byte数组

    Stream StreamObject = loFile.PostedFile.InputStream; //建立数据流对像    //读取图象文件数据，FileByteArray为数据储存体，0为数据指针位置、FileLnegth为数据长度    StreamObject.Read(FileByteArray,0,FileLength);     string fileName = Server.MapPath(".//WriteXml.xml");   //要打开的文件       XmlDocument xmlDoc = new XmlDocument();    xmlDoc.Load(fileName);    XmlNode root=xmlDoc.SelectSingleNode("dbImage");//查找<dbGuest>    XmlNodeList xnl=xmlDoc.SelectSingleNode("dbImage").ChildNodes;    int nIndex = xnl.Count;    //以下添加新结点    XmlElement xe1=xmlDoc.CreateElement("Image");//创建一个<User>节点

    XmlElement xesub1=xmlDoc.CreateElement("ImageID");    xesub1.InnerText=nIndex.ToString();//设置文本节点    xe1.AppendChild(xesub1);//添加到<User>节点中    XmlElement xesub2=xmlDoc.CreateElement("ImageContentType");    xesub2.InnerText=loFile.PostedFile.ContentType;    xe1.AppendChild(xesub2);    XmlElement xesub3=xmlDoc.CreateElement("ImageSize");    xesub3.InnerText=FileLength.ToString();    xe1.AppendChild(xesub3);    XmlElement xesub4=xmlDoc.CreateElement("ImageDescription");    xesub4.InnerText=tbDescription.Text;    xe1.AppendChild(xesub4);    XmlElement xesub5=xmlDoc.CreateElement("ImageData");    xesub5.InnerText= Convert.ToBase64String(FileByteArray);    xe1.AppendChild(xesub5);    root.AppendChild(xe1);//添加到<dbGuest>节点中    xmlDoc.Save(fileName);       Response.Redirect("ShowAllImg.aspx");   }   catch   {    }  }  private void Page_Load(object sender, System.EventArgs e)  {    string fileName = Server.MapPath("./WriteXml.xml");   //要打开的文件

   DataSet ds = new DataSet();   ds.ReadXml(fileName);   dgShow.DataSource = ds.Tables["image"].DefaultView;   dgShow.DataBind();  }  private void Page_Load(object sender, System.EventArgs e)  {    int ImgID = Convert.ToInt32(Request.QueryString["ID"]); //ID为图片ID    //建立数据库链接   string fileName = Server.MapPath(".//WriteXml.xml");   //要打开的文件      XmlDocument xmlDoc = new XmlDocument();   xmlDoc.Load(fileName);   XmlNodeList node =  xmlDoc.SelectSingleNode("//Image[ImageID='"+ImgID.ToString()+"']").ChildNodes;   if(node!=null)   {     string strType = node.Item(1).InnerText;    string strData =node.Item(4).InnerText;    int nSize = int.Parse(node.Item(2).InnerText);    Response.ContentType = strType;//设定输出文件类型    //输出图象文件二进制数制    Response.OutputStream.Write(Convert.FromBase64String(strData), 0, nSize);     Response.End();    //也可以保存为图像

    //   FileStream fs = new FileStream(@"C:/aa.BMP", FileMode.OpenOrCreate, FileAccess.Write);

    //   fs.Write((Convert.FromBase64String(strData), 0,nSize);

    //   fs.Close();   }  }

 

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