I would recommend using DOM(XmlDocument) if the document is not huge.
Because it is easier, especially in this context of reading special nodes.
XmlDocument doc = new XmlDocument();
doc.Load(strPath);
To get the first "DataIn" element:
// ASSUMING "Command" is direct descendant of root.
XmlNode node =
doc.DocumentElement.SelectSingleNode("Command[@id='A001']/Slot/DataIn");
Console.WriteLine(node.InnerText);
If you need more help, please explain exactly what you are trying to do.
--
Regards,
Dennis JD Myrén
Oslo Kodebureau
"Chua Wen Ching" <chua_wen_ching@nospam.hotmail.com> wrote in message
news:109A630D-3807-4F87-B3E2-D1F07ED3E635@microsoft.com...[color=blue]
> Hi there,
>
> I have some problems when reading XML file.
>
> 1. First this, is what i did, cause i can't seem to read "sub elements or
> tags" values, so i place those values into attributes like this.
>
> Before:
> ----------
>
> <?xml version="1.0" encoding="utf-8"?>
> <MyConfig>
> <Device Type="A1">
> <Open />
> <EstablishDevice>
> <DeviceName>Titan 12</DeviceName>
> <DeviceLength>8</DeviceLength>
> </EstablishDevice>
> <Reset>
> <Slot>0</Slot>
> </Reset>
> </Device>
> <Device Type="A2">
> <EstablishDevice>
> <DeviceName>Titan 13</DeviceName>
> <DeviceLength>8</DeviceLength>
> </EstablishDevice>
> <Reset>
> <Slot>1</Slot>
> </Device>
> </MyConfig>
>
> After:
> --------
>
> <?xml version="1.0" encoding="utf-8"?>
> <MyConfig>
> <Device Type="A1">
> <Open />
> <EstablishDevice Name="Titan 12" Length="8" />
> <Reset Slot="0" />
> </Device>
> <Device Type="A2">
> <Open />
> <EstablishDevice Name="Titan 13" Length="8" />
> <Reset Slot="1" />
> </Device>
> </MyConfig>
>
> So this is how my C# codes look like (but i think it is quite of wrong!)
>
> C# - Read XML Tag + Attributes + Processing:
> ------------------------------------------------------
>
> // strpath is the location of the xml file
> XmlTextReader xmlreader = new XmlTextReader(strPath);
>
> // Create instance of MyLibrary
> _library = new MyLibrary();
>
> string sName = string.Empty;
>
> while (xmlreader.Read())
> {
> switch (xmlreader.NodeType)
> {
> case XmlNodeType.Element:
> //
> //sName = xmlreader.Name;
> if (xmlreader.Name.Equals("Device"))
> {
> lstResult.Items.Add("Type of Reader: " +
> xmlreader.GetAttribute("Type"));
> lstResult.Items.Add("Build in progress ...");
> }
>
>
> if (xmlreader.Name.Equals("Open"))
> {
> try
> {
> // MyLibrary Open Method
> _library.Open();
> lstResult.Items.Add("OpenDevice is success");
> }
> catch (Exception e)
> {
> lstResult.Items.Add("Open is not success" + re.Message);
> }
> }
>
> if (xmlreader.Name.Equals("EstablishDevice"))
> {
> string deviceName = xmlreader.GetAttribute("Name");
> int deviceLength = Int32.Parse(xmlreader.GetAttribute("Length"));
>
> try
> {
> // Establish hardware connection
> _library.EstablishDevice(deviceName, deviceLength);
> lstResult.Items.Add("EstablishDevice " +
> xmlreader.GetAttribute("Name") + " " + xmlreader.GetAttribute("Length") +
> "
> is successfull!");
> }
> catch (Exception e)
> {
> lstResult.Items.Add("Error: " + e.Message);
> }
> }
>
> if (xmlreader.Name.Equals("Reset"))
> {
> short slotNumber = Int16.Parse(xmlreader.GetAttribute("Slot"));
>
> try
> {
> // Reset the hardware before used
> _library.Reset(slotNumber);
> lstResult.Items.Add("Reset Device at Slot " +
> xmlreader.GetAttribute("Slot") + " is successfull!");
> }
> catch (Exception e)
> {
> lstResult.Items.Add("Error: " + e.Message);
> }
> }
> break;
> }
> }
> }
>
> I really felt weird with the way i do. Is XPath a better technique to get
> values directly? Just say, if i have 1000 lines of xml code, it is going
> to
> read line by line even it does not use it. You get my meaning!
>
> Now is my problem. I want to test my data which looks like below (just
> want
> to avoid attributes for a while).
>
> Assuming:
>
> ....
> ....
> <Reset Slot="1" />
> <!-- Add-on -->
> </Device>
> <Command id="A001">
> <Slot Type="0">
> <DataIn>12345678</DataIn>
> <DataOut />
> </Slot>
> </Command>
> <Command id="A002">
> <Slot Type="0">
> <DataIn />
> <!-- Expect data out to be written here -->
> <DataOut></DataOut>
> </Slot>
> </Command>
> ...
> ...
> </MyConfig>
>
> So now how do i read those values from DataIn?
>
> I need to place some identification at Command, so i can know which
> command
> tag to write the dataout.
>
> Any help please? I hope you understand what is the problem here. If you
> think there is a better way, please let me know!
>
> Thanks.
> --
> Regards,
> Chua Wen Ching
> Visit us at
http://www.necoders.com[/color]
