azure - How to add logs in asp.net vNext -

i need set logs in asp.net application. it's easy add output console, need configure in azure. don't know how it. need log information occurs app file , read it.

the iloggerfactory allows app use implementation of ilogger , iloggerprovider.

for details on how implement interfaces properly, @ framework's consolelogger , consoleloggerprovider. see asp.net core documentation on logging.

here minimal example of custom ilogger started. this not production code, rather, demos enough technical depth either write own ilogger or use 1 community.

project.json

"dependencies": {     "microsoft.aspnet.mvc": "6.0.0-rc1-final",     "microsoft.aspnet.server.kestrel": "1.0.0-rc1-final",     "microsoft.extensions.logging": "1.0.0-rc1-final",     "microsoft.extensions.logging.console": "1.0.0-rc1-final" } 

myloggingprovider.cs

namespace loggingexample {     using microsoft.extensions.logging;      public class myloggingprovider : iloggerprovider     {         public ilogger createlogger(string categoryname)         {             return new mylogger();         }          public void dispose()         {             // todo cleanup         }     } } 

mylogger.cs

in azure want write somewhere other c:/temp/some-guid.txt. enough started, though, writing own simple logger.

namespace loggingexample {     using system;     using microsoft.extensions.logging;      public class mylogger : ilogger     {         public void log(loglevel loglevel, int eventid, object state,             exception exception, func<object, exception, string> formatter)         {             var builder = new stringbuilder();             if (formatter != null) {                 builder.appendline(formatter(state, exception));             }              var values = state ilogvalues;             if (values != null) {                 foreach (var v in values.getvalues()) {                     builder.appendline(v.key + ":" + v.value);                 }             }              var logpath = string.format("c:/temp/{0}.txt", guid.newguid());             file.writealltext(logpath, builder.tostring());         }          public bool isenabled(loglevel loglevel) {             return true;         }          public idisposable beginscopeimpl(object state) {             return null;         }     } } 

startup.cs

now in startup can use add logger via loggerfactory.addprovider(new myloggingprovider()). every call ilogger log provider.

namespace loggingexample {     using microsoft.aspnet.builder;     using microsoft.aspnet.http;     using microsoft.extensions.logging;      public class startup     {         public void configure(             iapplicationbuilder app,              iloggerfactory loggerfactory)         {             loggerfactory                 .addconsole(minlevel: loglevel.verbose)                 .addprovider(new myloggingprovider());              app.run(async (context) =>             {                 var logger = loggerfactory.createlogger("catchall");                 logger.loginformation("hello logger!");                  await context.response.writeasync("hello world!");             });         }     } } 

mycontroller.cs

anywhere supports dependency injection can receive ilogger log of providers registered in startup.configure method.

namespace loggingexample {     using microsoft.aspnet.mvc;     using microsoft.extensions.logging;     public class mycontroller : controller     {         public mycontroller(ilogger logger)         {             logger.loginformation("logging controller");         }     } }