Trace::Write 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)

static void Write(
	Object^ value


Type: System::Object^

An Object whose name is sent to the Listeners.

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

This method calls the Write method of the trace listener.


ASP.NET supplies tracing functionality tailored for Web pages. To write trace messages in ASP.NET pages, use the Page::Trace property.

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 TraceLevelError or higher, the example outputs the first name of the value parameter 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 a 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 = 
      gcnew TraceSwitch( "General", "Entire Application" );

   static void MyErrorMethod( Object^ myObject )
      #if defined(TRACE)
      // Write the message if the TraceSwitch level 
      // is set to Error or higher.
      if ( generalSwitch->TraceError )
         Trace::Write( myObject );

      // Write a second message if the TraceSwitch level
      // is set to Verbose.
      if ( generalSwitch->TraceVerbose )
          Trace::WriteLine( " is not a valid value for this method." );

.NET Framework
Available since 1.1
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