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/1[], String, Exception)

Indicates the warning level of execution.

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


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

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

Warn Overload

System.Web.Http.Tracing Namespace