Information
Switch
Switch
The topic you requested is included in another documentation set. For convenience, it's displayed below. Choose Switch to see the topic in its original location.

TextWriterTraceListener Constructor (TextWriter^)

.NET Framework (current version)
 

Initializes a new instance of the TextWriterTraceListener class using the specified writer as recipient of the tracing or debugging output.

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

C#
C++
F#
VB
Copy 
public:
TextWriterTraceListener(
	TextWriter^ writer
)

Parameters

writer
Type: System.IO::TextWriter^

A TextWriter that receives the output from the TextWriterTraceListener.

Exception Condition
ArgumentNullException

The writer is null.

This constructor initializes the Name property to an empty string ("").

The following code example creates a TextWriterTraceListener using the TextWriterTraceListener(TextWriter^) constructor. The example creates a StreamWriter, then references the StreamWriter when it creates the TextWriterTraceListener, which it then adds to the TraceListenerCollection. The example writes a message to all TraceListener objects in the TraceListenerCollection, then closes this TextWriterTraceListener.

C#
C++
VB
Copy 
#using <System.dll>
using namespace System;
using namespace System::IO;
using namespace System::Diagnostics;

void main()
{
   #if defined(TRACE)
   TextWriterTraceListener^ myTextListener = nullptr;

   // Create a file for output named TestFile.txt.
   String^ myFileName = "TestFile.txt";
   StreamWriter^ myOutputWriter = gcnew StreamWriter( myFileName,true );

   // Add a TextWriterTraceListener for the file.
   if ( myOutputWriter )
   {
      myTextListener = gcnew TextWriterTraceListener( myOutputWriter );
      Trace::Listeners->Add( myTextListener );
   }

   // Write trace output to all trace listeners.
   Trace::WriteLine( 
      String::Concat( DateTime::Now.ToString(), " - Trace output" ) );
   if ( myTextListener )
   {
      // Remove and close the file writer/trace listener.
      myTextListener->Flush();
      Trace::Listeners->Remove( myTextListener );
      myTextListener->Close();
   }
   #endif
}

.NET Framework
Available since 1.1
Return to top
Show: