How to use Console WriteLine in ASP NET C during debug

Question

I want to write some result to the console in ASP NET  C    It works in a Window application  but a Web application does not work  Here is what I have tried   protected void btonClick Click object sender  EventArgs e        Console WriteLine  You click me                            System Diagnostics Debug WriteLine  You click me                           System Diagnostics Trace WriteLine  You click me                           But I see nothing in the Output panel  How do I solve this problem

User · Answer

Make sure you start your application in Debug mode  F5   not without debugging  Ctrl F5  and then select  Show output from  Debug  in the Output panel in Visual Studio

User · Answer

Use response write method in the code-behind

User · Answer

If for whatever reason you d like to catch the output of Console WriteLine  you CAN do this   protected void Application Start object sender  EventArgs e        var writer   new LogWriter        Console SetOut writer      public class LogWriter   TextWriter       public override void WriteLine string value                  do whatever with value            public override Encoding Encoding               get   return Encoding Default

User · Answer

You shouldn t launch as an IIS server  check your launch setting  make sure it switched to your project name  change this name in your launchSettings json file    not the IIS

User · Answer

Console Write will not work in ASP NET as it is called using the browser  Use Response Write instead   See Stack Overflow question Where does Console WriteLine go in ASP NET    If you want to write something to Output window during debugging  you can use   System Diagnostics Debug WriteLine  SomeText      but this will work only during debug   See Stack Overflow question Debug WriteLine not working

User · Answer

Trace Write  Error Message   and Trace Warn  Error Message   are the methods to use in web  need to decorate the page header trace true and in config file to hide the error message text to go to end-user and so as to stay in iis itself for programmer debug

User · Answer

using System Diagnostics   The following will print to your output as long as the dropdown is set to  Debug  as shown below   Debug WriteLine  Hello  world

[c#] How to use Console.WriteLine in ASP.NET (C#) during debug?

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