Csharp/CSharp Tutorial/Development/Debug

Add Console.Out to TextWriterTraceListener

<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()

Add EventLogTraceListener 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("Example21_12.txt");
   Debug.Listeners.Add(tl);
   
   EventLogTraceListener t2 = new EventLogTraceListener("Application");
   Debug.Listeners.Add(t2);
   Debug.WriteLine("Starting Main()");
   Debug.Assert(1 == 2, "1 ==2");
   Debug.WriteLine("Exiting Main()");
   Debug.Flush();
   Debug.Close();
 }

}</source>

Debug and Trace Output

<source lang="csharp">// compile with: csc /r:system.dll file_1.cs using System; using System.Diagnostics; class MyClass {

   [Conditional("DEBUG")]
   public void VerifyState()
   {
       Debug.Assert(2 == 0, "Bad State");
   }

} class MainClass {

   public static void Main()
   {
       Debug.Listeners.Clear();
       Debug.Listeners.Add(new TextWriterTraceListener(Console.Out));
       MyClass c = new MyClass();
       
       c.VerifyState();
       c.VerifyState();
   }

}</source>

Debug Assert

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

  public static void Main(){
    Debug.Assert(1 == 0,"Error!","Error: 1 == 0");
  }

}</source>

Set up a TraceListener to a file

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

 public static void Main() 
 {
   TextWriterTraceListener tl = new TextWriterTraceListener("Example21_12.txt");
   Debug.Listeners.Add(tl);
   
   EventLogTraceListener t2 = new EventLogTraceListener("Application");
   Debug.Listeners.Add(t2);
   Debug.WriteLine("Starting Main()");
   Debug.Assert(1 == 2, "1 ==2");
   Debug.WriteLine("Exiting Main()");
   Debug.Flush();
   Debug.Close();
 }

}</source>

Using Switches to Control Debug and Trace: BooleanSwitch

<source lang="csharp">// compile with: csc /D:DEBUG /r:system.dll boolean.cs using System; using System.Diagnostics; class MyClass {

   public MyClass(int i)
   {
       this.i = i;
   }
   
   [Conditional("DEBUG")]
   public void VerifyState()
   {
       Debug.WriteLineIf(debugOutput.Enabled, "VerifyState Start");
       
       if (debugOutput.Enabled)
           Debug.WriteLine("VerifyState End");
   }
   
   BooleanSwitch debugOutput =  new BooleanSwitch("MyClassDebugOutput", "Control debug output");
   int i = 0;

} class MainClass {

   public static void Main()
   {
       Debug.Listeners.Clear();
       Debug.Listeners.Add(new TextWriterTraceListener(Console.Out));
       MyClass c = new MyClass(1);
       
       c.VerifyState();
   }

}</source>

Using Switches to Control Debug and Trace: TraceSwitch

<source lang="csharp">// compile with: csc /r:system.dll file_1.cs using System; using System.Diagnostics; class MyClass {

   public MyClass(int i)
   {
       this.i = i;
   }
   
   [Conditional("DEBUG")]
   public void VerifyState()
   {
       Debug.WriteLineIf(debugOutput.TraceInfo, "VerifyState Start");
       
       Debug.WriteLineIf(debugOutput.TraceVerbose, "Starting field verification");
       
       if (debugOutput.TraceInfo)
       Debug.WriteLine("VerifyState End");
   }
   
   static TraceSwitch debugOutput =  new TraceSwitch("MyClassDebugOutput", "Control debug output");
   int i = 0;

} class MainClass {

   public static void Main()
   {
       Debug.Listeners.Clear();
       Debug.Listeners.Add(new TextWriterTraceListener(Console.Out));
       MyClass c = new MyClass(1);
       
       c.VerifyState();
   }

}</source>