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Trace.WriteLine Method (Object, String)

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

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

'Declaration
<ConditionalAttribute("TRACE")> _
Public Shared Sub WriteLine ( _
	value As Object, _
	category As String _
)
'Usage
Dim value As Object
Dim category As String

Trace.WriteLine(value, category)
/** @attribute ConditionalAttribute("TRACE") */ 
public static void WriteLine (
	Object value, 
	String category
)
ConditionalAttribute("TRACE") 
public static function WriteLine (
	value : Object, 
	category : String
)

Parameters

value

An Object whose name is sent to the Listeners.

category

A category name used to organize the output.

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

The category parameter can be used to group output messages.

This method calls the WriteLine method of the trace listener.

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

If the switch is set to the TraceLevelError 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 second error message on the same line as the first message. The second message is followed by a line terminator.

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

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


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

public static void MyErrorMethod(Object myObject, String category)
{
    // Write the message if the TraceSwitch level is set to Error or higher.
    if (generalSwitch.get_TraceError()) {
        Trace.Write("Invalid object for category. ");
    }

    // Write a second message if the TraceSwitch level is set to Verbose.
    if (generalSwitch.get_TraceVerbose()) {
        Trace.WriteLine(myObject, category);
    }
} //MyErrorMethod

// Create a TraceSwitch.
var generalSwitch : TraceSwitch = new TraceSwitch("General", "Entire Application")

function MyErrorMethod(myObject : Object, category : String){
  // Write the message if the TraceSwitch level is set to Verbose.
  if(generalSwitch.TraceVerbose)
    Trace.WriteLine(myObject, category)
  // Write a second message if the TraceSwitch level is set to Error or higher.
  if(generalSwitch.TraceError)
    Trace.WriteLine(" Object is not valid for this category.")
}


Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

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

.NET Framework

Supported in: 2.0, 1.1, 1.0

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