TextWriterTraceListener Class

Definition

Namespace:

System.Diagnostics

Assembly:

System.Diagnostics.TextWriterTraceListener.dll

Source:

TextWriterTraceListener.cs

Directs tracing or debugging output to a TextWriter or to a Stream, such as FileStream.

public ref class TextWriterTraceListener : System::Diagnostics::TraceListener

public class TextWriterTraceListener : System.Diagnostics.TraceListener

type TextWriterTraceListener = class
    inherit TraceListener

Public Class TextWriterTraceListener
Inherits TraceListener

Inheritance

Object

MarshalByRefObject

TraceListener

TextWriterTraceListener

Derived

System.Diagnostics.ConsoleTraceListener

System.Diagnostics.DelimitedListTraceListener

System.Diagnostics.EventSchemaTraceListener

System.Diagnostics.XmlWriterTraceListener

Examples

The following example implements an instance of the TextWriterTraceListener class that uses a StreamWriter called myOutputWriter to write to a file named TestFile.txt. First the example creates a file for output. Then it creates the StreamWriter for the first text writer, assigns it the output file, and adds it to the Listeners. Then, the code outputs one line of text to the file. Finally, the example flushes the output buffer.

After running this sample, you can open the TestFile.txt file to see the output.

void main()
{
   #if defined(TRACE)
   // Create a file for output named TestFile.txt.
   Stream^ myFile = File::Create( "TestFile.txt" );
   
   // Create a new text writer using the output stream and
   // add it to the trace listeners.
   TextWriterTraceListener^ myTextListener = 
      gcnew TextWriterTraceListener( myFile );
   Trace::Listeners->Add( myTextListener );
  
   // Write output to the file.
   Trace::Write( "Test output " );
  
   // Flush the output.
   Trace::Flush();
   Trace::Close();
   #endif
}

public class Sample
{

public static int Main(string[] args) {
    // Create a file for output named TestFile.txt.
    Stream myFile = File.Create("TestFile.txt");

    /* Create a new text writer using the output stream, and add it to
     * the trace listeners. */
    TextWriterTraceListener myTextListener = new
       TextWriterTraceListener(myFile);
    Trace.Listeners.Add(myTextListener);

    // Write output to the file.
    Trace.Write("Test output ");

    // Flush the output.
    Trace.Flush();

    return 0;
 }
}

Public Class Sample
    
    Public Shared Sub Main()
        ' Create a file for output named TestFile.txt.
        Dim myFile As Stream = File.Create("TestFile.txt")
        
        ' Create a new text writer using the output stream, and add it to
        ' the trace listeners. 
        Dim myTextListener As New TextWriterTraceListener(myFile)
        Trace.Listeners.Add(myTextListener)

        
        ' Write output to the file.
        Trace.Write("Test output ")
        
        ' Flush the output.
        Trace.Flush() 

        System.Environment.ExitCode = 0
    End Sub

End Class

Remarks

The TextWriterTraceListener class provides the Writer property to get or set the text writer that receives the tracing or debugging output.

Important

This type implements the IDisposable interface. When you have finished using the type, you should dispose of it either directly or indirectly. To dispose of the type directly, call its Dispose method in a try/catch block. To dispose of it indirectly, use a language construct such as using (in C#) or Using (in Visual Basic). For more information, see the "Using an Object that Implements IDisposable" section in the IDisposable interface topic.

This class also provides methods to Close the Writer so that it no longer receives tracing or debugging output, to Flush the output buffer for the Writer, and to Write a message to the Writer.

You must enable tracing or debugging to use a trace listener. The following syntax is compiler specific. If you use compilers other than C# or Visual Basic, refer to the documentation for your compiler.

• To enable debugging in C#, add the /d:DEBUG flag to the compiler command line when you compile your code, or you can add #define DEBUG to the top of your file. In Visual Basic, add the /d:DEBUG=True flag to the compiler command line.

• To enable tracing in C#, add the /d:TRACE flag to the compiler command line when you compile your code, or add #define TRACE to the top of your file. In Visual Basic, add the /d:TRACE=True flag to the compiler command line.

To add a trace listener in a .NET Framework app, edit the configuration file that corresponds to the name of your application. Within this file, you can add a listener, set its type and set its parameter, remove a listener, or clear all the listeners previously set by the application. The configuration file should be formatted like the following example.

<configuration>  
  <system.diagnostics>  
    <trace autoflush="false" indentsize="4">  
      <listeners>  
        <add name="myListener"   
          type="System.Diagnostics.TextWriterTraceListener"   
          initializeData="TextWriterOutput.log" />  
        <remove name="Default" />  
      </listeners>  
    </trace>  
  </system.diagnostics>  
</configuration>  

Note

If an attempt is made to write to a file that is in use or unavailable, the file name is automatically prefixed by a GUID.

Constructors

TextWriterTraceListener()	Initializes a new instance of the TextWriterTraceListener class with TextWriter as the output recipient.
TextWriterTraceListener(Stream)	Initializes a new instance of the TextWriterTraceListener class, using the stream as the recipient of the debugging and tracing output.
TextWriterTraceListener(Stream, String)	Initializes a new instance of the TextWriterTraceListener class with the specified name, using the stream as the recipient of the debugging and tracing output.
TextWriterTraceListener(String)	Initializes a new instance of the TextWriterTraceListener class, using the file as the recipient of the debugging and tracing output.
TextWriterTraceListener(String, String)	Initializes a new instance of the TextWriterTraceListener class with the specified name, using the file as the recipient of the debugging and tracing output.
TextWriterTraceListener(TextWriter)	Initializes a new instance of the TextWriterTraceListener class using the specified writer as recipient of the tracing or debugging output.
TextWriterTraceListener(TextWriter, String)	Initializes a new instance of the TextWriterTraceListener class with the specified name, using the specified writer as recipient of the tracing or debugging output.

Properties

Attributes	Gets the custom trace listener attributes defined in the application configuration file. (Inherited from TraceListener)
Filter	Gets or sets the trace filter for the trace listener. (Inherited from TraceListener)
IndentLevel	Gets or sets the indent level. (Inherited from TraceListener)
IndentSize	Gets or sets the number of spaces in an indent. (Inherited from TraceListener)
IsThreadSafe	Gets a value indicating whether the trace listener is thread safe. (Inherited from TraceListener)
Name	Gets or sets a name for this TraceListener. (Inherited from TraceListener)
NeedIndent	Gets or sets a value indicating whether to indent the output. (Inherited from TraceListener)
TraceOutputOptions	Gets or sets the trace output options. (Inherited from TraceListener)
Writer	Gets or sets the text writer that receives the tracing or debugging output.

Methods

Close()	Closes the Writer so that it no longer receives tracing or debugging output.
CreateObjRef(Type)	Creates an object that contains all the relevant information required to generate a proxy used to communicate with a remote object. (Inherited from MarshalByRefObject)
Dispose()	Releases all resources used by the TraceListener. (Inherited from TraceListener)
Dispose(Boolean)	Disposes this TextWriterTraceListener object.
Equals(Object)	Determines whether the specified object is equal to the current object. (Inherited from Object)
Fail(String)	Emits an error message to the listener you create when you implement the TraceListener class. (Inherited from TraceListener)
Fail(String, String)	Emits an error message and a detailed error message to the listener you create when you implement the TraceListener class. (Inherited from TraceListener)
Flush()	Flushes the output buffer for the Writer.
GetHashCode()	Serves as the default hash function. (Inherited from Object)
GetLifetimeService()	Obsolete. Retrieves the current lifetime service object that controls the lifetime policy for this instance. (Inherited from MarshalByRefObject)
GetSupportedAttributes()	Gets the custom attributes supported by the trace listener. (Inherited from TraceListener)
GetType()	Gets the Type of the current instance. (Inherited from Object)
InitializeLifetimeService()	Obsolete. Obtains a lifetime service object to control the lifetime policy for this instance. (Inherited from MarshalByRefObject)
MemberwiseClone()	Creates a shallow copy of the current Object. (Inherited from Object)
MemberwiseClone(Boolean)	Creates a shallow copy of the current MarshalByRefObject object. (Inherited from MarshalByRefObject)
ToString()	Returns a string that represents the current object. (Inherited from Object)
TraceData(TraceEventCache, String, TraceEventType, Int32, Object)	Writes trace information, a data object and event information to the listener specific output. (Inherited from TraceListener)
TraceData(TraceEventCache, String, TraceEventType, Int32, Object[])	Writes trace information, an array of data objects and event information to the listener specific output. (Inherited from TraceListener)
TraceEvent(TraceEventCache, String, TraceEventType, Int32)	Writes trace and event information to the listener specific output. (Inherited from TraceListener)
TraceEvent(TraceEventCache, String, TraceEventType, Int32, String)	Writes trace information, a message, and event information to the listener specific output. (Inherited from TraceListener)
TraceEvent(TraceEventCache, String, TraceEventType, Int32, String, Object[])	Writes trace information, a formatted array of objects and event information to the listener specific output. (Inherited from TraceListener)
TraceTransfer(TraceEventCache, String, Int32, String, Guid)	Writes trace information, a message, a related activity identity and event information to the listener specific output. (Inherited from TraceListener)
Write(Object)	Writes the value of the object's ToString() method to the listener you create when you implement the TraceListener class. (Inherited from TraceListener)
Write(Object, String)	Writes a category name and the value of the object's ToString() method to the listener you create when you implement the TraceListener class. (Inherited from TraceListener)
Write(String)	Writes a message to this instance's Writer.
Write(String, String)	Writes a category name and a message to the listener you create when you implement the TraceListener class. (Inherited from TraceListener)
WriteIndent()	Writes the indent to the listener you create when you implement this class, and resets the NeedIndent property to false. (Inherited from TraceListener)
WriteLine(Object)	Writes the value of the object's ToString() method to the listener you create when you implement the TraceListener class, followed by a line terminator. (Inherited from TraceListener)
WriteLine(Object, String)	Writes a category name and the value of the object's ToString() method to the listener you create when you implement the TraceListener class, followed by a line terminator. (Inherited from TraceListener)
WriteLine(String)	Writes a message to this instance's Writer followed by a line terminator. The default line terminator is a carriage return followed by a line feed (\r\n).
WriteLine(String, String)	Writes a category name and a message to the listener you create when you implement the TraceListener class, followed by a line terminator. (Inherited from TraceListener)

See also

• TraceListener
• DefaultTraceListener
• ConsoleTraceListener
• EventLogTraceListener
• Stream
• TextWriter
• Debug
• Trace