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IisTraceListener Class

Provides a listener that routes all tracing and debugging output to the IIS 7.0 infrastructure.

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

[AspNetHostingPermissionAttribute(SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
[HostProtectionAttribute(SecurityAction.LinkDemand, Synchronization = true)]
public sealed class IisTraceListener : TraceListener


The HostProtectionAttribute attribute applied to this type or member has the following Resources property value: Synchronization. The HostProtectionAttribute does not affect desktop applications (which are typically started by double-clicking an icon, typing a command, or entering a URL in a browser). For more information, see the HostProtectionAttribute class or SQL Server Programming and Host Protection Attributes.

The IisTraceListener class connects the tracing mechanism of ASP.NET to IIS 7.0. This listener class enables developers who create ASP.NET applications and who implement the IHttpModule and IHttpHandler interfaces to raise page-level, module-level, or handler-level events to the IIS 7.0 infrastructure when tracing is enabled.


This listener class does not route IIS 7.0 events to ASP.NET classes. This includes the Page class and classes that implement the IHttpModule or IHttpHandler interface.

IisTraceListener is introduced in the .NET Framework version 3.5. For more information, see .NET Framework 3.5 Architecture.

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5 SP1, 3.0 SP1, 2.0 SP1