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Trace.Write Method (String, String)

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

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

[ConditionalAttribute("TRACE")] 
public static void Write (
	string message,
	string category
)
/** @attribute ConditionalAttribute("TRACE") */ 
public static void Write (
	String message, 
	String category
)
ConditionalAttribute("TRACE") 
public static function Write (
	message : String, 
	category : String
)

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 Write method of the trace listener.

NoteNote

ASP.NET supplies tracing functionality tailored for Web pages. To write trace messages in ASP.NET pages, use the Page.Trace property. For more information about tracing in ASP.NET pages, see the ASP.NET Tracing Overview topic.

By default, in code associated with an ASP.NET Web page, the statement Trace.Write("...") is a call to the Write method of the Page.Trace property. To use the System.Diagnostics.Trace class in Web pages, you must include the namespace, for example, System.Diagnostics.Trace.Write("...").

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

If the switch is set to the TraceLevelVerbose, 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 Error or higher, 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.
 static TraceSwitch generalSwitch = new TraceSwitch("General", "Entire Application");
 
 static public void MyErrorMethod(Object myObject, String category) {
    // 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.");
 }


// 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 Verbose.
    if (generalSwitch.get_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.get_TraceError()) {
        Trace.WriteLine(" Please use a different 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.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.")
}


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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