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Indicates the trace listeners in the Listeners collection.

Namespace:  System.Web.Http.Tracing
Assembly:  System.Web.Http (in System.Web.Http.dll)


<ExtensionAttribute> _
Public Shared Sub Trace ( _
    traceWriter As ITraceWriter, _
    request As HttpRequestMessage, _
    category As String, _
    level As TraceLevel, _
    exception As Exception _
Dim traceWriter As ITraceWriter 
Dim request As HttpRequestMessage 
Dim category As String 
Dim level As TraceLevel 
Dim exception As Exception 

traceWriter.Trace(request, category, _
    level, exception)
public static void Trace(
    this ITraceWriter traceWriter,
    HttpRequestMessage request,
    string category,
    TraceLevel level,
    Exception exception
static void Trace(
    ITraceWriter^ traceWriter, 
    HttpRequestMessage^ request, 
    String^ category, 
    TraceLevel level, 
    Exception^ exception
static member Trace : 
        traceWriter:ITraceWriter * 
        request:HttpRequestMessage * 
        category:string * 
        level:TraceLevel * 
        exception:Exception -> unit
public static function Trace(
    traceWriter : ITraceWriter, 
    request : HttpRequestMessage, 
    category : String, 
    level : TraceLevel, 
    exception : Exception


  • request
    Type: HttpRequestMessage

    The HttpRequestMessage with which to associate the trace. It may be null.

  • category
    Type: System.String

    The logical category of the trace.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type ITraceWriter. When you use instance method syntax to call this method, omit the first parameter. For more information, see or

See Also


ITraceWriterExtensions Class

Trace Overload

System.Web.Http.Tracing Namespace