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Write XML Log

xenia27
xenia27 asked
on
Medium Priority
599 Views
Last Modified: 2008-01-09
Hi,

I want to write a log in xml format...a simple log...just recording date and time and some context...
This is what I do...

WriteLog("Start Program...");
WriteLog("Testing 1...");
WriteLog("Testing 2...");

public void WriteLog(string logstr)
{
            XmlTextWriter   xmlWriter = new XmlTextWriter("HttpListenerLog.xml", System.Text.Encoding.UTF8);
            DateTime        dt = DateTime.Now;

            xmlWriter.Formatting = Formatting.Indented;
            xmlWriter.WriteProcessingInstruction("xml", "version='1.0' encoding='UTF-8'");
            xmlWriter.WriteStartElement("MSG");
            xmlWriter.WriteAttributeString("Time", dt.ToString());
            xmlWriter.WriteAttributeString("Msg", logstr);
           
            xmlWriter.Close();
}

Here is what I wanna see...
<?xml version='1.0' encoding='UTF-8'?>
<MSG>
<INFO Time="2006/11/1 AM 11:08:48" Msg="Start Program..." />
<INFO Time="2006/11/1 AM 11:08:50" Msg="Testing 1..."/>
</MSG>

Something like this.  How can I modify my code to do this?
Comment
Watch Question

public void WriteLog(string logstr)
{
        DateTime        dt = DateTime.Now;

        XmlTextWriter   xmlWriter = new XmlTextWriter("HttpListenerLog.xml", System.Text.Encoding.UTF8);
       
         //This is the start of the document      
            xmlWriter.Formatting = Formatting.Indented;
            xmlWriter.WriteProcessingInstruction("xml", "version='1.0' encoding='UTF-8'");

            xmlWriter.WriteStartElement("MSG");
            xmlWriter.WriteStartElement("INFO");
            xmlWriter.WriteAttributeString("Time", dt.ToString());
            xmlWriter.WriteAttributeString("Msg", logstr);
            xmlWriter.WriteEndElement();
            xmlWriter.WriteEndElement();

         //this is the end of the document
         xmlWriter.WriteEndDocument();              
         xmlWriter.Flush();
         xmlWriter.Close();

}

you will need to do a foreach inside your function to get all of the INFO fields.

public void WriteLog(string logstr)
{
        DateTime        dt = DateTime.Now;

        XmlTextWriter   xmlWriter = new XmlTextWriter("HttpListenerLog.xml", System.Text.Encoding.UTF8);
       
         //This is the start of the document      
            xmlWriter.Formatting = Formatting.Indented;
            xmlWriter.WriteProcessingInstruction("xml", "version='1.0' encoding='UTF-8'");

            xmlWriter.WriteStartElement("MSG");
****Do a foreach here
            xmlWriter.WriteStartElement("INFO");
            xmlWriter.WriteAttributeString("Time", dt.ToString());
            xmlWriter.WriteAttributeString("Msg", logstr);
            xmlWriter.WriteEndElement();
*** end foreach
            xmlWriter.WriteEndElement();

         //this is the end of the document
         xmlWriter.WriteEndDocument();              
         xmlWriter.Flush();
         xmlWriter.Close();

}

Author

Commented:
If I have something existed in HttpListenerLog.xml file and I would like to keep it in my file and add new context, how can I do so?
Thanks for your help~
You can do several different things you can so

1. you can move all of your data into a hashtable, then add what you need then have it write back out.

2. You can add your data into a dataset. then add to the dataset and then write it backout

3. http://www.c-sharpcorner.com/xml/InsertDatatoXMLDocument.asp

4. You can use XPath

5. http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpguide/html/cpconinsertingnodesintoxmldocument.asp

6.

XmlDocument doc = new XmlDocument();
FileStream myFile = new FileStream(@"C:\blabla.xml", FileMode.Open);
doc.Load(myFile);
XmlNode root = doc.FirstChild;
//create new node
XmlElement elem = doc.CreateElement("INFO");
elem.InnerText = "this is my text to add";
//add node to the document
root.InsertAfter(elem, root.FirstChild);

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Author

Commented:
Thanks for your help~ ^^
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