c# - pass value from app.config from one console application to one class library -

in console application have on app.config

 <appsettings>     <add key="microsoft.servicebus.connectionstring" value="endpoint=sb://xx.servicebus.windows.net/;sharedaccesskeyname=rootmanagesharedaccesskey;sharedaccesskey=xx/krm="/>   </appsettings> 

the console application following:

 static void main(string[] args)         {             try             {                 console.writeline("press key continue");                 console.readkey();                 queuehelper.receivemessage("empresa");             }             catch (exception ex)             {                  throw ex;             }         } 

however wanted isolate queing methods in different class library, actual implementation of receivemessage in class library

 /// <summary>         /// receives message         /// </summary>         /// <param name="queuname"></param>         public static void receivemessage(string queuname)         {             queueclient client = queueclient.createfromconnectionstring(connectionstring, "empresa");              // configure callback options             onmessageoptions options = new onmessageoptions();             options.autocomplete = false;             options.autorenewtimeout = timespan.fromminutes(1);              // callback handle received messages             client.onmessage((message) =>             {                 try                 {                     empresa empresa = getbody<empresa>(message);                     // process message queue                     //console.writeline("body: " + );                     console.writeline("messageid: " + message.messageid);                      // remove message queue                     message.complete();                 }                 catch (exception ex)                 {                     // indicates problem, unlock message in queue                     message.abandon();                 }             }, options);         } 

the problem trying connection string info app.config local library , not caller.

so null connection string.

now, dont want duplicate app settings in class library projects, how , best way achieve this?

one of reasons @ end console app installed in azure webjob, , azure has interface change appsettings webjobs, not class libraries.

using reflection might able hold of application configuration calling assembly.

below sample code

public static void receivemessage(string queuname)     {         var assembly = assembly.getcallingassembly();          string configpath = new uri(assembly.codebase).localpath;         var configmanager = configurationmanager.openexeconfiguration(configpath);         var connectionstring = configmanager.connectionstrings.currentconfiguration.appsettings.settings["microsoft.servicebus.connectionstring"];           queueclient client = queueclient.createfromconnectionstring(connectionstring, "empresa");          // configure callback options         onmessageoptions options = new onmessageoptions();         options.autocomplete = false;         options.autorenewtimeout = timespan.fromminutes(1);          // callback handle received messages         client.onmessage((message) =>         {             try             {                 empresa empresa = getbody(message);                 // process message queue                 //console.writeline("body: " + );                 console.writeline("messageid: " + message.messageid);                  // remove message queue                 message.complete();             }             catch (exception ex)             {                 // indicates problem, unlock message in queue                 message.abandon();             }         }, options);     } 

the configurationmanager part of system.configuration assembly.

if have more complex scenario please post details , try figure out solution.