C# using Linq to XML to get and set specific elements from a third party app.config

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HI,

I need to work with the listeners child nodes "add" (get and set attributes such as name, toAddress,fromAddress, subjectLineStarter, subjectLineEnder, smtpServer,smtpPort, filter, rollSizeKB, fileName) in "loggingConfiguration" Section by using Linq from a third party app.config (not my application's configuration file).
How can I do this?

Please find below the third party app.config from which I've to get information and save back to modifications.

Best Regards,
TEK001

XML

<loggingConfiguration name="ITE Logging Application Block" tracingEnabled="true" defaultCategory="Info" logWarningsWhenNoCategoriesMatch="true">
    <listeners>
      <add name="IteProjectEmailAdministrator" type="Microsoft.Practices.EnterpriseLibrary.Logging.TraceListeners.EmailTraceListener, Microsoft.Practices.EnterpriseLibrary.Logging, Version=5.0.414.0, Culture=neutral, PublicKeyToken=45fr1254ee458e89" listenerDataType="Microsoft.Practices.EnterpriseLibrary.Logging.Configuration.EmailTraceListenerData, Microsoft.Practices.EnterpriseLibrary.Logging, Version=5.0.414.0, Culture=neutral, PublicKeyToken=45fr1254ee458e89" toAddress="aa@zz.com" fromAddress="noreply-ddsproject@zz.com" subjectLineStarter="ITEProject Critical Logs" subjectLineEnder="Urgent" smtpServer="smtp.zz.net" smtpPort="25" formatter="Text Formatter" traceOutputOptions="None" filter="Off" />
      <add name="IteProjectErrorRollingFlatFile" type="Microsoft.Practices.EnterpriseLibrary.Logging.TraceListeners.RollingFlatFileTraceListener, Microsoft.Practices.EnterpriseLibrary.Logging, Version=5.0.414.0, Culture=neutral, PublicKeyToken=45fr1254ee458e89" listenerDataType="Microsoft.Practices.EnterpriseLibrary.Logging.Configuration.RollingFlatFileTraceListenerData, Microsoft.Practices.EnterpriseLibrary.Logging, Version=5.0.414.0, Culture=neutral, PublicKeyToken=45fr1254ee458e89" fileName="C:\logs\LogIteProjectError.log" footer="" formatter="Text Formatter" header="" rollFileExistsBehavior="Increment" rollInterval="None" rollSizeKB="100" timeStampPattern="yyyy-MM-dd" traceOutputOptions="None" filter="Error" />
      <add name="IteProjectExceptionRollingFlatFile" type="Microsoft.Practices.EnterpriseLibrary.Logging.TraceListeners.RollingFlatFileTraceListener, Microsoft.Practices.EnterpriseLibrary.Logging, Version=5.0.414.0, Culture=neutral, PublicKeyToken=45fr1254ee458e89" listenerDataType="Microsoft.Practices.EnterpriseLibrary.Logging.Configuration.RollingFlatFileTraceListenerData, Microsoft.Practices.EnterpriseLibrary.Logging, Version=5.0.414.0, Culture=neutral, PublicKeyToken=45fr1254ee458e89" fileName="C:\logs\LogIteProjectException.log" footer="" formatter="Text Formatter" header="" rollFileExistsBehavior="Increment" rollInterval="None" rollSizeKB="100" timeStampPattern="yyyy-MM-dd" traceOutputOptions="None" filter="All" />
      <add name="IteProjectInformationRollingFlatFile" type="Microsoft.Practices.EnterpriseLibrary.Logging.TraceListeners.RollingFlatFileTraceListener, Microsoft.Practices.EnterpriseLibrary.Logging, Version=5.0.414.0, Culture=neutral, PublicKeyToken=45fr1254ee458e89" listenerDataType="Microsoft.Practices.EnterpriseLibrary.Logging.Configuration.RollingFlatFileTraceListenerData, Microsoft.Practices.EnterpriseLibrary.Logging, Version=5.0.414.0, Culture=neutral, PublicKeyToken=45fr1254ee458e89" fileName="C:\logs\LogIteProjectInfo.log" footer="" formatter="Text Formatter" header="" rollFileExistsBehavior="Increment" rollInterval="None" rollSizeKB="100" timeStampPattern="yyyy-MM-dd" traceOutputOptions="None" filter="Information" />
      <add name="IteProjectWarningRollingFlatFile" type="Microsoft.Practices.EnterpriseLibrary.Logging.TraceListeners.RollingFlatFileTraceListener, Microsoft.Practices.EnterpriseLibrary.Logging, Version=5.0.414.0, Culture=neutral, PublicKeyToken=45fr1254ee458e89" listenerDataType="Microsoft.Practices.EnterpriseLibrary.Logging.Configuration.RollingFlatFileTraceListenerData, Microsoft.Practices.EnterpriseLibrary.Logging, Version=5.0.414.0, Culture=neutral, PublicKeyToken=45fr1254ee458e89" fileName="C:\logs\LogIteProjectWarning.log" footer="" formatter="Text Formatter" header="" rollFileExistsBehavior="Increment" rollInterval="None" rollSizeKB="100" timeStampPattern="yyyy-MM-dd" traceOutputOptions="None" filter="Warning" />
      <add name="IteProjectCriticalRollingFlatFile" type="Microsoft.Practices.EnterpriseLibrary.Logging.TraceListeners.RollingFlatFileTraceListener, Microsoft.Practices.EnterpriseLibrary.Logging, Version=5.0.414.0, Culture=neutral, PublicKeyToken=45fr1254ee458e89" listenerDataType="Microsoft.Practices.EnterpriseLibrary.Logging.Configuration.RollingFlatFileTraceListenerData, Microsoft.Practices.EnterpriseLibrary.Logging, Version=5.0.414.0, Culture=neutral, PublicKeyToken=45fr1254ee458e89" fileName="C:\logs\LogIteProjectCritical.log" footer="" formatter="Text Formatter" header="" rollFileExistsBehavior="Increment" rollInterval="None" rollSizeKB="100" timeStampPattern="yyyy-MM-dd" traceOutputOptions="None" filter="Critical" />
      <add name="IteProjectDebugRollingFlatFile" type="Microsoft.Practices.EnterpriseLibrary.Logging.TraceListeners.RollingFlatFileTraceListener, Microsoft.Practices.EnterpriseLibrary.Logging, Version=5.0.414.0, Culture=neutral, PublicKeyToken=45fr1254ee458e89" listenerDataType="Microsoft.Practices.EnterpriseLibrary.Logging.Configuration.RollingFlatFileTraceListenerData, Microsoft.Practices.EnterpriseLibrary.Logging, Version=5.0.414.0, Culture=neutral, PublicKeyToken=45fr1254ee458e89" fileName="C:\logs\LogIteProjectDebug.log" footer="" formatter="Text Formatter" header="" rollFileExistsBehavior="Increment" rollInterval="None" rollSizeKB="100" timeStampPattern="yyyy-MM-dd" traceOutputOptions="None" filter="Verbose" />
    </listeners>

Posted 24-Apr-15 0:45am

tek001

Updated 24-Apr-15 1:14am

John C Rayan

v3

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Comments

Maciej Los 24-Apr-15 7:19am

What have you tried? Where are you stuck?

tek001 24-Apr-15 7:28am

Hi,

I tried treating the app.config file as an XMLFIle so I did this to get the chlidNode of the node <listeners>

:

public void getListeners(string appName)
{
try

{

string FILE_NAME = string.Concat(appName, ".config");

XmlTextReader reader = new XmlTextReader(FILE_NAME);

XmlDocument doc = new XmlDocument();

doc.Load(reader);

reader.Close();

string nodeRoute = "loggingConfiguration";

XmlNodeList elemList = doc.GetElementsByTagName(nodeRoute);

{
foreach (XmlNode elem in elemList)
{

foreach (XmlNode elemChild in elem.ChildNodes)
{
if (elemChild.Name.ToString() == "listeners")
{
int cpt = 0;

foreach (XmlNode item in elemChild.ChildNodes)
{
MessageBox.Show(item.OuterXml.ToString());

cpt++;
}

}
}

}

}

}
catch (Exception ex)
{

errorHandler(ex);

}

}
Now how can I get the different attributes separately?
And since the OuterXml property is read only, how can I do to set values?

Thanks for your help.

Best regards,
Tek001

John C Rayan 24-Apr-15 8:20am

Hi tek001
Your code is not LINQ. Check my solution

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John C Rayan · Accepted Answer · 2015-04-24T01:44:00

I have shown you how to change fromAddress attribute. You take the idea and can apply to other attributes. Change the file location to your config file.

XML

string xFile = @"C:\John Rayan\LogConfig.xml";
     XDocument xDoc = XDocument.Load(xFile);
     List<XElement> adds = (from add in xDoc.Descendants("add")
                            select add).ToList();
     adds.ForEach(add => { if(add.Attribute("fromAddress") != null) add.Attribute("fromAddress").Value = "myname@xx.com"; });
     xDoc.Save(xFile);