Csharp/CSharp Tutorial/Development/Trace Listener

Add ConsoleTraceListener to Trace

<source lang="csharp">using System; using System.Collections.Generic; using System.Diagnostics; using System.Text;

public class MainClass {

   public static void Main()
   {
       Trace.Listeners.Add(new ConsoleTraceListener());
   }

}</source>

Add DefaultTraceListener to Trace

<source lang="csharp">using System; using System.Collections.Generic; using System.Diagnostics; using System.Text;

public class MainClass {

   public static void Main()
   {
       DefaultTraceListener dtl = new DefaultTraceListener();
       dtl.AssertUiEnabled = true;
       Trace.Listeners.Add(dtl);
   }

}</source>

Add TextWriterTraceListener to Debug Listener

<source lang="csharp">#define DEBUG using System; using System.Globalization; using System.Diagnostics; class MainClass {

 public static void Main() 
 {
   TextWriterTraceListener tl = new TextWriterTraceListener(Console.Out);
   Debug.Listeners.Add(tl);
   Debug.WriteLine("Starting Main()");
   Debug.Assert(1 == 2, "1==2");
   Debug.WriteLine("Exiting Main()");
 }

}</source>

Starting Main()
Fail: 1==2
Exiting Main()

Clear Trace Listener and Add EventLogTraceListener

<source lang="csharp">using System; using System.Diagnostics; using System.Collections; using System.Data; using System.Text; public class MainClass{

  public static void Main(){
    Trace.Listeners.Clear(); // clear all listeners
    Trace.Listeners.Add(new EventLogTraceListener("BugRiddenLog"));
    Debug.Assert(1 == 0,"Error!","Error: 1 == 0");
  }

}</source>

Demonstrates debug output

<source lang="csharp">#define DEBUG using System; using System.Globalization; using System.Diagnostics; class MainClass {

 public static void Main() 
 {
   TextWriterTraceListener tl = new TextWriterTraceListener(Console.Out);
   Debug.Listeners.Add(tl);
   Debug.WriteLine("Starting Main()");
   Debug.Assert(1 == 2, "1==2");
   Debug.WriteLine("Exiting Main()");
 }

}</source>

Starting Main()
Fail: 1==2
Exiting Main()

Post-deployment tracing

<source lang="csharp">#define TRACE using System; using System.Globalization; using System.Diagnostics; class MainClass {

 public static void Main() 
 {
   BooleanSwitch bsEnableTrace = new BooleanSwitch("TraceOutput", "Turn on tracing");
   TextWriterTraceListener tl = new TextWriterTraceListener("tract.txt");
   Trace.Listeners.Add(tl);
   EventLogTraceListener t2 = new EventLogTraceListener("Application");
   Trace.Listeners.Add(t2);
   Trace.WriteLineIf(bsEnableTrace.Enabled,"Starting Main()");
   if (bsEnableTrace.Enabled) 
   {
     Trace.Assert( 1 == 2, "1 == 2");
   }
   Trace.WriteLineIf(bsEnableTrace.Enabled, "Exiting Main()");
   Trace.Flush();
   Trace.Close();
 }

}</source>

Write Trace based on the BooleanSwitch

<source lang="csharp">#define TRACE using System; using System.Globalization; using System.Diagnostics; class MainClass {

 public static void Main() 
 {
   BooleanSwitch bsEnableTrace = new BooleanSwitch("TraceOutput", "Turn on tracing");
   TextWriterTraceListener tl = new TextWriterTraceListener("tract.txt");
   Trace.Listeners.Add(tl);
   EventLogTraceListener t2 = new EventLogTraceListener("Application");
   Trace.Listeners.Add(t2);
   Trace.WriteLineIf(bsEnableTrace.Enabled,"Starting Main()");
   if (bsEnableTrace.Enabled) 
   {
     Trace.Assert( 1 == 2, "1 == 2");
   }
   Trace.WriteLineIf(bsEnableTrace.Enabled, "Exiting Main()");
   Trace.Flush();
   Trace.Close();
 }

}</source>