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Displays an error message in the list with the specified writer, request, category, exception, message format and argument.

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


<ExtensionAttribute> _
Public Shared Sub Error ( _
    traceWriter As ITraceWriter, _
    request As HttpRequestMessage, _
    category As String, _
    exception As Exception, _
    messageFormat As String, _
    ParamArray messageArguments As Object() _
Dim traceWriter As ITraceWriter 
Dim request As HttpRequestMessage 
Dim category As String 
Dim exception As Exception 
Dim messageFormat As String 
Dim messageArguments As Object()

traceWriter.Error(request, category, _
    exception, messageFormat, messageArguments)
public static void Error(
    this ITraceWriter traceWriter,
    HttpRequestMessage request,
    string category,
    Exception exception,
    string messageFormat,
    params Object[] messageArguments
static void Error(
    ITraceWriter^ traceWriter, 
    HttpRequestMessage^ request, 
    String^ category, 
    Exception^ exception, 
    String^ messageFormat, 
    ... array<Object^>^ messageArguments
static member Error : 
        traceWriter:ITraceWriter * 
        request:HttpRequestMessage * 
        category:string * 
        exception:Exception * 
        messageFormat:string * 
        messageArguments:Object[] -> unit
public static function Error(
    traceWriter : ITraceWriter, 
    request : HttpRequestMessage, 
    category : String, 
    exception : Exception, 
    messageFormat : String, 
    ... messageArguments : Object[]


  • 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.

  • messageArguments
    Type: System.Object[]

    The argument in the message.

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

Error Overload

System.Web.Http.Tracing Namespace