C#寫XML

下段代碼將會產生形如：

<Root>

<Node Key = "" Value = ""></Node>

<Node>....

</Root>

這樣的XML檔案。下段代碼中有很多是自訂的字串常量。還有使用Hashtable的地方。

  public void Save()
  {
   FileInfo fi = new FileInfo(_fileName);
   if (!fi.Exists)// to do
    fi.Create();
   XmlTextWriter xw = null;
   try
   {
    XmlDocument xml = new XmlDocument();
    xw = new XmlTextWriter(_fileName, Encoding.UTF8);
    xml.WriteTo(xw);
    System.Collections.ICollection keys = _ht.Keys;
    xw.WriteStartElement("Root");

    foreach(string key in keys)
    {
     xw.WriteStartElement("Node");
     xw.WriteAttributeString(KEY, key);
     xw.WriteAttributeString(VALUE, _ht[key] as string);
     xw.WriteEndElement();
    }
    xw.WriteEndElement();
    xml.Save(xw);
   }
   catch (UnauthorizedAccessException)
   {
    // to do
    //access deny
   }
   catch (Exception)
   {
    //to do
   }
   finally
   {
    if (null != xw)
    {
     xw.Close();
    }
   }
  }