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Showing content from https://learn.microsoft.com/en-us/dotnet/api/system.diagnostics.tracing.eventsource.writeevent below:

EventSource.WriteEvent Method (System.Diagnostics.Tracing) | Microsoft Learn

Source:

EventSource.cs

Source:

EventSource.cs

Source:

EventSource.cs

Source:

EventSource.cs

Writes an event by using the provided event identifier and string argument.

protected:
 void WriteEvent(int eventId, System::String ^ arg1);

protected void WriteEvent(int eventId, string arg1);

protected void WriteEvent(int eventId, string? arg1);

member this.WriteEvent : int * string -> unit

Protected Sub WriteEvent (eventId As Integer, arg1 As String)

eventId

Int32

The event identifier. This value should be between 0 and 65535.

arg1

String

A string argument.

The following example shows how to use this method overload to write an event. This code example is part of a larger example provided for the EventSource class.

[Event(1, Message = "Application Failure: {0}", Level = EventLevel.Error, Keywords = Keywords.Diagnostic)]
public void Failure(string message) { WriteEvent(1, message); }

<[Event](1, Message:="Application Failure: {0}", Level:=EventLevel.Error, Keywords:=Keywords.Diagnostic)> _
Public Sub Failure(ByVal message As String)
    WriteEvent(1, message)
End Sub

eventid should be greater than 0 or less than 65535 or errors can occur in the operation. If errors do occur, you can get more information about the source of the error by checking the output stream of the debugger, if you have a debugger attached to the process firing events. You can also look for errors reported in the ETW event stream, if you have an ETW listener on the event source where the error occurs.

When you implement a method that is identified as an ETW event in an EventSource-derived class. You must call the base class WriteEvent method passing the EventId and the same arguments as the implemented method similar to the following example.

[Event(2, Level = EventLevel.Informational)]
public void Info1(string arg1)
{
    base.WriteEvent(2, arg1);
}

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