Export (0) Print
Expand All

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)

'Declaration
<ConditionalAttribute("TRACE")> _
Public Shared Sub Write ( _
	value As Object _
)
'Usage
Dim value As Object

Trace.Write(value)
/** @attribute ConditionalAttribute("TRACE") */ 
public static void Write (
	Object value
)
ConditionalAttribute("TRACE") 
public static function Write (
	value : Object
)

Parameters

value

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.

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 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.
Private Shared generalSwitch As New TraceSwitch("General", "Entire Application")    

Public Shared Sub MyErrorMethod(myObject As Object)
    ' Write the message if the TraceSwitch level is set to Error or higher.
    If generalSwitch.TraceError Then
        Trace.Write(myObject)
    End If 
    ' Write a second message if the TraceSwitch level is set to Verbose.
    If generalSwitch.TraceVerbose Then
        Trace.WriteLine(" is not a valid value for this method.")
    End If
End Sub


// Class-level declaration.
// Create a TraceSwitch.
private static TraceSwitch generalSwitch = 
    new TraceSwitch("General", "Entire Application");

public static void MyErrorMethod(Object myObject)
{
    // Write the message if the TraceSwitch level is set to Error or higher.
    if (generalSwitch.get_TraceError()) {
        Trace.Write(myObject);
    }

    // Write a second message if the TraceSwitch level is set to Verbose.
    if (generalSwitch.get_TraceVerbose()) {
        Trace.WriteLine(" is not a valid value for this method.");
    }
} //MyErrorMethod

// Create a TraceSwitch.
var generalSwitch : TraceSwitch = new TraceSwitch("General", "Entire Application")    

function MyErrorMethod(errorObject : Object){
  // Write a message if the TraceSwitch level is set to Error or higher.
  if(generalSwitch.TraceError){
    Trace.Write(errorObject)

    // 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.")
    else
      Trace.WriteLine("")
  }
}


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

Community Additions

ADD
Show:
© 2014 Microsoft