Debug.WriteLine Method (Object) (System.Diagnostics)

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.NET Framework Class Library

Debug.WriteLine Method (Object)

Writes the value of the object's ToString method to the trace listeners in the Listeners collection.

Namespace: System.Diagnostics
Assembly: System (in System.dll)

Syntax

Visual Basic

<ConditionalAttribute("DEBUG")> _
Public Shared Sub WriteLine ( _
	value As Object _
)

[ConditionalAttribute("DEBUG")]
public static void WriteLine(
	Object value
)

Visual C++

[ConditionalAttribute(L"DEBUG")]
public:
static void WriteLine(
	Object^ value
)

[<ConditionalAttribute("DEBUG")>]
static member WriteLine : 
        value:Object -> unit

Parameters

value: Type: System.Object
An object whose name is sent to the Listeners.

Remarks

By default, the output is written to an instance of DefaultTraceListener.

This method calls the WriteLine method of the trace listener.

Examples

The following example creates a TraceSwitch named generalSwitch. This switch is set outside of the code sample.

If the switch is set to the TraceLevel Error or higher, the example outputs the first error message to the Listeners. For information on adding a listener to the Listeners collection, see the TraceListenerCollection class.

Then, if the TraceLevel is set to Verbose, the example outputs the name of the object on the same line as the first message. A line terminator follows the second message.

Visual Basic


' Class-level declaration.
' Create a TraceSwitch.
Private Shared generalSwitch As New TraceSwitch("General", "Entire Application")


Public Shared Sub MyErrorMethod(myObject As Object)
    ' Write the message if the TraceSwitch level is set to Error or higher.
    If generalSwitch.TraceError Then
        Debug.Write("Invalid object. ")
    End If 
    ' Write a second message if the TraceSwitch level is set to Verbose.
    If generalSwitch.TraceVerbose Then
        Debug.WriteLine(myObject)
    End If
End Sub 'MyErrorMethod


// Class-level declaration.
 // Create a TraceSwitch.
 static TraceSwitch generalSwitch = new TraceSwitch("General", "Entire Application");

 static public void MyErrorMethod(Object myObject) {
    // Write the message if the TraceSwitch level is set to Error or higher.
    if(generalSwitch.TraceError)
       Debug.Write("Invalid object. ");

    // Write a second message if the TraceSwitch level is set to Verbose.
    if(generalSwitch.TraceVerbose)
       Debug.WriteLine(myObject);
 }

Visual C++


   // Class-level declaration.
   // Create a TraceSwitch.
   static TraceSwitch^ generalSwitch = 
      gcnew TraceSwitch( "General","Entire Application" );

public:
   static void MyErrorMethod( Object^ myObject )
   {
      // Write the message if the TraceSwitch level is set to Error or higher.
      if ( generalSwitch->TraceError )
      {
         #if defined(DEBUG)
         Debug::Write( "Invalid object. " );
         #endif
      }
      // Write a second message if the TraceSwitch level is set to Verbose.
      if ( generalSwitch->TraceVerbose )
      {
         #if defined(DEBUG)
         Debug::WriteLine( myObject );
         #endif
      }
   }

Version Information

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

Platforms

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Reference

Debug Class

WriteLine Overload

System.Diagnostics Namespace

Debug

Trace

BooleanSwitch

TraceSwitch

TraceListener

DefaultTraceListener

ConsoleTraceListener

ConditionalAttribute