试图从中调用IronPythonVB.net版-“未声明名称‘PythonEngine’。”

我在尝试复制 this example of calling IronPython IronPython 创造了一个VB.net版控制台应用程序。我添加了对IronPython安装文件夹中所有DLL的引用:

• 铁蟒
• IronPython.模块
• 铁蟒蛇
• Microsoft.Scripting.ExtensionAttribute文件
• Microsoft.Scripting.Core

我有这个源代码:

Option Explicit On
Option Strict On

Imports Microsoft.Scripting.Hosting
Imports Microsoft.Scripting
Imports IronPython.Hosting
Imports IronPython.Runtime.Types

Module Module1
    Public Class HelloWorldVB
        Public Overridable Function HelloWorld(ByVal name As String) As String
            Return String.Format("Hello '{0}' from Visual Basic", name)
        End Function
    End Class

    Sub Main()
        Dim helloWorld As New HelloWorldVB()
        Console.WriteLine(helloWorld.HelloWorld("Maurice"))

        Dim runtime As ScriptRuntime = PythonEngine.CurrentEngine.Runtime
        Dim scope As ScriptScope = Runtime.ExecuteFile("HelloWorld.py")
        Dim pythonType As PythonType = scope.GetVariable(Of PythonType)("HelloWorldIronPython")
        helloWorld = CType(Runtime.Operations.Call(pythonType), HelloWorldVB)
        Console.WriteLine(helloWorld.HelloWorld("Maurice"))

        Console.ReadLine()
    End Sub
End Module

我收到错误“名称'PythonEngine'未声明。”

这个例子过时了还是我有错误?