TraceListener Class
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TraceListener Class

 

Provides the abstract base class for the listeners who monitor trace and debug output.

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


[HostProtectionAttribute(SecurityAction.LinkDemand, Synchronization = true)]
public abstract class TraceListener : MarshalByRefObject, IDisposable

NameDescription
System_CAPS_protmethodTraceListener()

Initializes a new instance of the TraceListener class.

System_CAPS_protmethodTraceListener(String)

Initializes a new instance of the TraceListener class using the specified name as the listener.

NameDescription
System_CAPS_pubpropertyAttributes

Gets the custom trace listener attributes defined in the application configuration file.

System_CAPS_pubpropertyFilter

Gets and sets the trace filter for the trace listener.

System_CAPS_pubpropertyIndentLevel

Gets or sets the indent level.

System_CAPS_pubpropertyIndentSize

Gets or sets the number of spaces in an indent.

System_CAPS_pubpropertyIsThreadSafe

Gets a value indicating whether the trace listener is thread safe.

System_CAPS_pubpropertyName

Gets or sets a name for this TraceListener.

System_CAPS_protpropertyNeedIndent

Gets or sets a value indicating whether to indent the output.

System_CAPS_pubpropertyTraceOutputOptions

Gets or sets the trace output options.

NameDescription
System_CAPS_pubmethodClose()

When overridden in a derived class, closes the output stream so it no longer receives tracing or debugging output.

System_CAPS_pubmethodCreateObjRef(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.)

System_CAPS_pubmethodDispose()

Releases all resources used by the TraceListener.

System_CAPS_protmethodDispose(Boolean)

Releases the unmanaged resources used by the TraceListener and optionally releases the managed resources.

System_CAPS_pubmethodEquals(Object)

Determines whether the specified object is equal to the current object.(Inherited from Object.)

System_CAPS_pubmethodFail(String)

Emits an error message to the listener you create when you implement the TraceListener class.

System_CAPS_pubmethodFail(String, String)

Emits an error message and a detailed error message to the listener you create when you implement the TraceListener class.

System_CAPS_protmethodFinalize()

Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.(Inherited from Object.)

System_CAPS_pubmethodFlush()

When overridden in a derived class, flushes the output buffer.

System_CAPS_pubmethodGetHashCode()

Serves as the default hash function. (Inherited from Object.)

System_CAPS_pubmethodGetLifetimeService()

Retrieves the current lifetime service object that controls the lifetime policy for this instance.(Inherited from MarshalByRefObject.)

System_CAPS_protmethodGetSupportedAttributes()

Gets the custom attributes supported by the trace listener.

System_CAPS_pubmethodGetType()

Gets the Type of the current instance.(Inherited from Object.)

System_CAPS_pubmethodInitializeLifetimeService()

Obtains a lifetime service object to control the lifetime policy for this instance.(Inherited from MarshalByRefObject.)

System_CAPS_protmethodMemberwiseClone()

Creates a shallow copy of the current Object.(Inherited from Object.)

System_CAPS_protmethodMemberwiseClone(Boolean)

Creates a shallow copy of the current MarshalByRefObject object.(Inherited from MarshalByRefObject.)

System_CAPS_pubmethodToString()

Returns a string that represents the current object.(Inherited from Object.)

System_CAPS_pubmethodTraceData(TraceEventCache, String, TraceEventType, Int32, Object)

Writes trace information, a data object and event information to the listener specific output.

System_CAPS_pubmethodTraceData(TraceEventCache, String, TraceEventType, Int32, Object[])

Writes trace information, an array of data objects and event information to the listener specific output.

System_CAPS_pubmethodTraceEvent(TraceEventCache, String, TraceEventType, Int32)

Writes trace and event information to the listener specific output.

System_CAPS_pubmethodTraceEvent(TraceEventCache, String, TraceEventType, Int32, String)

Writes trace information, a message, and event information to the listener specific output.

System_CAPS_pubmethodTraceEvent(TraceEventCache, String, TraceEventType, Int32, String, Object[])

Writes trace information, a formatted array of objects and event information to the listener specific output.

System_CAPS_pubmethodTraceTransfer(TraceEventCache, String, Int32, String, Guid)

Writes trace information, a message, a related activity identity and event information to the listener specific output.

System_CAPS_pubmethodWrite(Object)

Writes the value of the object's ToString method to the listener you create when you implement the TraceListener class.

System_CAPS_pubmethodWrite(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.

System_CAPS_pubmethodWrite(String)

When overridden in a derived class, writes the specified message to the listener you create in the derived class.

System_CAPS_pubmethodWrite(String, String)

Writes a category name and a message to the listener you create when you implement the TraceListener class.

System_CAPS_protmethodWriteIndent()

Writes the indent to the listener you create when you implement this class, and resets the NeedIndent property to false.

System_CAPS_pubmethodWriteLine(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.

System_CAPS_pubmethodWriteLine(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.

System_CAPS_pubmethodWriteLine(String)

When overridden in a derived class, writes a message to the listener you create in the derived class, followed by a line terminator.

System_CAPS_pubmethodWriteLine(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.

For examples of how to implement a TraceListener, see the DefaultTraceListener, TextWriterTraceListener and the EventLogTraceListener classes.

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, 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 similar to 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>

For more information on using configuration files for tracing, see <system.diagnostics> Element.

Notes to Inheritors:

Inherit from this class to implement a custom listener for the Debug and Trace classes. At a minimum, you must implement the Write and WriteLine methods. Additionally, you can implement the Fail, Close and Flush methods.

.NET Framework
Available since 1.1

This type is thread safe.

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