Creating a non-trival custom GP tool - inputs, outputs, and responding to environment settings
' Copyright 2008 ESRI
' All rights reserved under the copyright laws of the United States
' and applicable international laws, treaties, and conventions.
' You may freely redistribute and use this sample code, with or
' without modification, provided you include the original copyright
' notice and use restrictions.
' See use restrictions at <your ArcGIS install location>/developerkit/userestrictions.txt.

Imports Microsoft.VisualBasic
Imports System
Imports ESRI.ArcGIS.Geoprocessing
Imports ESRI.ArcGIS.Geodatabase

Namespace GPPointFileInfo
  Public Class ESScratchWorkspace
        Implements GPPointFileInfo.IESScratchWorkspace
    Private Const _EnvironmentName As String = "scratchWorkspace"
    Private _path As String

    Public Sub New(ByVal gpEnvironmentManager As IGPEnvironmentManager)
      Dim gpValue As IGPValue = gpEnvironmentManager.GetGPValue(_EnvironmentName)

      _path = GetPath(gpValue)
    End Sub

        Public ReadOnly Property Path() As String Implements IESScratchWorkspace.Path
                Return _path
            End Get
        End Property

    Private Function GetPath(ByVal gpValue As IGPValue) As String
      Dim path As String

      Dim deWorkspace As IDEWorkspace = TryCast(gpValue, IDEWorkspace)

      Dim dataElement As IDataElement = TryCast(deWorkspace, IDataElement)

      path = dataElement.CatalogPath

      Return path
    End Function
  End Class
End Namespace