c# - log4net - Append errors to an xml file -

i trying append error xml file, not able append way wanted.

i using custom layout overriding xmllayout format method shown below.

public class myxmllayout : log4net.layout.xmllayout {     public static bool isfirsttime = true;      protected override void formatxml(system.xml.xmlwriter writer, loggingevent loggingevent)     {         if (isfirsttime)         {             writer.writestartdocument();             writer.writestartelement("exceptions");         }          writer.writestartelement("exception");          writer.writestartelement("error");         writer.writeattributestring("date", loggingevent.timestamp.touniversaltime().tostring());         writer.writeattributestring("user", loggingevent.username);         writer.writestring(loggingevent.renderedmessage);          writer.writeendelement();         writer.writeendelement();          if (isfirsttime)         {             writer.writeendelement();             writer.writeenddocument();              isfirsttime = false;         }     } } 

yes, appending through above code, problem unable read xml file not in proper format.

the generated xml above code looks like

<?xml version="1.0" encoding="windows-1252"?>  <exceptions>  	<exception>  		<error date="11-11-2014 13:47:53" user="sourceedge sunilkumar">exception 1</error>  	</exception>  </exceptions>    <?xml version="1.0" encoding="windows-1252"?>  <exceptions>  	<exception>  		<error date="11-11-2014 14:01:44" user="sourceedge\sunilkumar">exception 2</error>  	</exception>  </exceptions>

and should

<?xml version="1.0" encoding="windows-1252"?>  <exceptions>    <exception>      <error date="11-11-2014 13:47:53" user="sourceedge\sunilkumar">exception 1</error>    </exception>    <exception>      <error date="11-11-2014 14:01:44" user="sourceedge\sunilkumar">exception 2</error>    </exception>  </exceptions>

please solution.

updated per comment.

its ending exceptions tag prematurely because told

if (isfirsttime) {     writer.writestartdocument();     writer.writestartelement("exceptions"); } 

and

if (isfirsttime) {     writer.writeendelement(); } 

rearrange code writer starts xml document , exceptions element when file opened , ends before file closed.

a quick google suggests these should go overrides header , footer respectively, instead of in override format have.

this link vb, gives idea of how want:

http://blogs.lessthandot.com/index.php/desktopdev/mstech/making-an-xmllayout-for-log4net/