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EventLogTraceListener.TraceEvent Method (TraceEventCache, String, TraceEventType, Int32, String, Object[])

Writes trace information, a formatted array of objects, and event information to the event log.

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

public override void TraceEvent(
	TraceEventCache eventCache,
	string source,
	TraceEventType severity,
	int id,
	string format,
	params Object[] args


Type: System.Diagnostics.TraceEventCache
An object that contains the current process ID, thread ID, and stack trace information.
Type: System.String
A name used to identify the output; typically the name of the application that generated the trace event.
Type: System.Diagnostics.TraceEventType
One of the enumeration values that specifies the type of event that has caused the trace.
Type: System.Int32
A numeric identifier for the event. The combination of source and id uniquely identifies an event.
Type: System.String
A format string that contains zero or more format items that correspond to objects in the args array.
Type: System.Object[]
An object array containing zero or more objects to format.


source is not specified.


The log entry string exceeds 32,766 characters.

Important noteImportant

The TraceEvent methods are not intended to be called by application code. These methods are called by methods of the Debug, Trace, and TraceSource classes to write trace data.

The TraceEvent method is intended to trace events that can be processed automatically by tools. For example a monitoring tool can notify an administrator if a specific event is traced by a specific source.

The eventCache and source parameters are used to determine if the event should be traced. id is used to create an EventInstance object and the TraceEventType is equated to an EventLogEntryType for the EntryType property. The EventInstance is written to the event log, using the WriteEvent method, with the message obtained from the format and args parameters. The args object array is converted to a string using the Format method, passing the format string and args array to format the string as the message for the event log.


The maximum value of the id parameter is 65,535. If the id value specified is greater than 65,535, the maximum value is used.

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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