Public Delegate Sub GPToolExecuteEventHandler( _
   ByVal eventName As String, _
   ByVal o As Object _
) 

public delegate void GPToolExecuteEventHandler( 
   string eventName,
   object o
)

Parameters

eventName

The event name values are:

• "OnValidate" - triggers when internal validation is done.
• "OnMessage"
• "OnProgressMessage"
• "OnProgressPos"
• "OnBeginExecute" - triggers when execution begins.
• "OnEndExecute" - triggers when execution is complete.

o

Message object. Use following type conversion - see code example below.

• "OnValidate" - (o as IGPMessage[])
• "OnMessage" - (o as IGPMessage)
• "OnProgressMessage" - (string)o
• "OnProgressPos" - (int)o
• "OnBeginExecute" - o = null
• "OnEndExecute" - (o as IGPResult)

Target Platforms: Windows 11 Home, Pro, Enterprise (64 bit)

Reference

GPToolExecuteEventHandler Members
ArcGIS.Desktop.Core.Geoprocessing Namespace