The title says Silverlight but I think this will work for any C# web application (MVC, Web Forms … this is just where I tried it)

Sometimes debugging web applications with service calls can be … well… fun when you want to see what happens to your app when the service is unreachable.

For web applications Console.Writeline() is not an option, and while System.Diagnostics.Debug.WriteLine() works. I typically still get an exception in the service request and I am not 100% sure that the end user will not see the same thing.

Here’s what I did.

Create a static class and name it something simple like Log.cs

Add a static method like so

public static void Logs(this object obj)
        {
            HtmlWindow window = HtmlPage.Window;
            var isConsoleAvailable = (bool)window.Eval("typeof(console)" +
                    " != 'undefined' && typeof(console.log) != 'undefined'");
            if (isConsoleAvailable)
            {
                var console = window.Eval("console.log") as ScriptObject;
                if (console != null)
                {
                    console.InvokeSelf(obj);
                }
            }
        }

Now anywhere in your application you can call .Logs() like so

if(debugCheck)
    {
        "ClientPingCompleted".Logs();
        var error = "return error : " + e.Error;
        error.Logs();
    }

In the browser console you will see this.