Asp.net 生成自定义站点地图时出错

我正在尝试构建一个自定义站点地图 我在这个网站上查看代码

我已经尽可能地把它转换成vb.net

这是我的密码

Partial Class Main

Inherits StaticSiteMapProvider

Dim conn As New ConnectionVB
Dim _rootNode As SiteMapNode = Nothing
Dim _siteMapFileName As String
Dim SiteMapNodeName As String = "siteMapNode"

Public Sub DynamicSiteMapProvider()
End Sub

Public Shadows Function RootNode() As SiteMapNode
    Return BuildSiteMap()
End Function

Public Overrides Sub Initialize(name As String, attributes As NameValueCollection)
    //Me.Initialize(name, attributes)
    _siteMapFileName = attributes("siteMapFile")
End Sub

Protected Overrides Function GetRootNodeCore() As SiteMapNode
    Return RootNode()
End Function

Protected Overrides Sub clear()
    SyncLock Me
        _rootNode = Nothing
        //Me.clear()
    End SyncLock
End Sub

Public Overrides Function BuildSiteMap() As SiteMapNode
    SyncLock Me
        If _rootNode Is Nothing Then
            clear()
            Dim siteMapXml As XmlDocument = LoadSiteMapXml()
            Dim rootElement As XmlElement = CType(siteMapXml.GetElementsByTagName(SiteMapNodeName)(0), XmlElement)
            AddDynamicNodes(rootElement)
            GenerateSiteMapNodes(rootElement)
        End If
    End SyncLock
    Return _rootNode
End Function

Private Function LoadSiteMapXml() As XmlDocument
    Dim siteMapXml As XmlDocument = New XmlDocument()
    siteMapXml.Load(AppDomain.CurrentDomain.BaseDirectory + _siteMapFileName)
    Return siteMapXml
End Function

Protected Sub AddDynamicNodes(rootElement As XmlElement)
    Dim teams As XmlElement = AddDynamicChildElement(rootElement, "", "FootballTeams", "List of football team")
End Sub

Protected Function AddDynamicChildElement(parentElement As XmlElement, url As String, title As String, description As String) As XmlElement
    Dim childElement As XmlElement = parentElement.OwnerDocument.CreateElement(SiteMapNodeName)
    childElement.SetAttribute("url", url)
    childElement.SetAttribute("title", title)
    childElement.SetAttribute("description", description)

    parentElement.AppendChild(childElement)
    Return childElement
End Function

Protected Sub GenerateSiteMapNodes(rootElement As XmlElement)
    _rootNode = GetSiteMapNodeFromElement(rootElement)
    AddNode(_rootNode)
    CreateChildNodes(rootElement, _rootNode)
End Sub

Protected Sub CreateChildNodes(parentElement As XmlElement, parentNode As SiteMapNode)
    For Each XmlElement As XmlNode In parentElement.ChildNodes
        If XmlElement.Name = SiteMapNodeName Then
            Dim childNode As SiteMapNode = GetSiteMapNodeFromElement(CType(XmlElement, XmlElement))
            AddNode(childNode, parentNode)
            CreateChildNodes(CType(XmlElement, XmlElement), childNode)
        End If
    Next
End Sub

Protected Function GetSiteMapNodeFromElement(rootElement As XmlElement) As SiteMapNode
    Dim newSiteMapNode As SiteMapNode
    Dim url As String = rootElement.GetAttribute("url")
    Dim title As String = rootElement.GetAttribute("title")
    Dim description As String = rootElement.GetAttribute("description")

    newSiteMapNode = New SiteMapNode(Me, (url + title).GetHashCode().ToString(), url, title, description)
    Return newSiteMapNode
End Function

End Class

我犯了这样的错误

System.ArgumentException: Provider name cannot be null or empty.

我不知道这个错误的原因是什么 有人能帮我吗

谢谢你的帮助

谢谢

---

PS：如果我的英语搞砸了，很抱歉，请确保您已将其添加到web配置中

<system.web>

    <siteMap defaultProvider="main">

        <providers>

            <add siteMapFile="Web.sitemap"  name="main" type="System.Web.XmlSiteMapProvider"/>

        </providers>

    </siteMap>

---

请确保您已在web配置中添加此项

<system.web>

    <siteMap defaultProvider="main">

        <providers>

            <add siteMapFile="Web.sitemap"  name="main" type="System.Web.XmlSiteMapProvider"/>

        </providers>

    </siteMap>

aw谢谢，这真的很有用！！！事实上，我已经在我的web.config上添加了它，但是我在示例中看到的类型与他的名称空间和类的名称完全相同……无论如何，谢谢你再给我一次机会，嗯，你能进一步帮助我吗？？？我已经照你的建议做了，效果很好。。但是现在，这段代码没有做任何事情..我犯了什么错误吗？你需要检查你的类，确保在将它转换为vb时没有遗漏什么。然后需要再次将type=“System.Web.XmlSiteMapProvider”from设置为此类type=“harryott.Web.dynamicItemApprovider”，如本文所示。是的，我缺少1个类..public dynamicItemApprovider（）：base（）{}。我不知道如何在vb.net中做到这一点…有什么建议吗？哦，谢谢，这真的很有用！！！事实上，我已经在我的web.config上添加了它，但是我在示例中看到的类型与他的名称空间和类的名称完全相同……无论如何，谢谢你再给我一次机会，嗯，你能进一步帮助我吗？？？我已经照你的建议做了，效果很好。。但是现在，这段代码没有做任何事情..我犯了什么错误吗？你需要检查你的类，确保在将它转换为vb时没有遗漏什么。然后需要再次将type=“System.Web.XmlSiteMapProvider”from设置为此类type=“harryott.Web.dynamicItemApprovider”，如本文所示。是的，我缺少1个类..public dynamicItemApprovider（）：base（）{}。我不知道如何在vb.net中做到这一点…有什么建议吗？？