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Trace.WriteLine Method (String, String)

Writes a category name and message to the trace listeners in the Listeners collection.

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

[ConditionalAttribute("TRACE")] 
public static void WriteLine (
	string message,
	string category
)
/** @attribute ConditionalAttribute("TRACE") */ 
public static void WriteLine (
	String message, 
	String category
)
ConditionalAttribute("TRACE") 
public static function WriteLine (
	message : String, 
	category : String
)
Not applicable.

Parameters

message

A message to write.

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 and the category on the same line as the first message. The second message is followed by a line terminator.

// Class-level declaration.
 // Create a TraceSwitch.
 static TraceSwitch generalSwitch = new TraceSwitch("General", "Entire Application");
 
 static public void MyErrorMethod(String category) {
    // Write the message if the TraceSwitch level is set to Error or higher.
    if(generalSwitch.TraceError)
       Trace.Write("My error message. ");
 
    // Write a second message if the TraceSwitch level is set to Verbose.
    if(generalSwitch.TraceVerbose)
       Trace.WriteLine("My second error message.", category);
 }


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

public static void MyErrorMethod(String category)
{
    // Write the message if the TraceSwitch level is set to Error or higher.
    if (generalSwitch.get_TraceError()) {
        Trace.Write("My error message. ");
    }

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

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

function MyErrorMethod(myObject : Object, category : String)
{
   @if(@TRACE)
   // Write the message if the TraceSwitch level is set to Verbose.
   if(generalSwitch.TraceVerbose)
   {
      Trace.Write(myObject.ToString() + 
         " is not a valid object for category: ", category)
   }
  
   // Write a second message if the TraceSwitch level is set to
   // Error or higher.
   if(generalSwitch.TraceError)
   {
      Trace.WriteLine(" Please use a different category.")
   }
   @end
}

Windows 98, Windows Server 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 Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

XNA Framework

Supported in: 1.0

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