CODEWITHSUNDEEP
c#asp.netvisual-studio-2010console
Leap Bun
Leap Bun

Reputation: 2295

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

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?

Upvotes: 102

Views: 220310

Answers (7)

Guokas
Guokas

Reputation: 830

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.

enter image description here

Upvotes: 1

phn
phn

Reputation: 1820

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.

Upvotes: -2

albin.varghese
albin.varghese

Reputation: 59

Use response.write method in the code-behind.

Upvotes: 0

PraveenVenu
PraveenVenu

Reputation: 8337

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.

Upvotes: 212

DeepakJoseLopez
DeepakJoseLopez

Reputation: 27

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.

Upvotes: 2

David
David

Reputation: 3804

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; }
    }
}

Upvotes: 11

cillierscharl
cillierscharl

Reputation: 7117

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!");

enter image description here

Upvotes: 34

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