SiteMapPath node event wont update properties ?

Question

User1909155429 posted

I am trying to alter the parent node to accept a querystring. It seems to change the initial url to a query string url once only. On subsequent events it does not alter the string for the new parameter querystring value? It seems to retain the original url in memory?

Protected Sub Page_Load(sender As Object, e As System.EventArgs) Handles Me.Load
If IsPostBack = False Then

AddHandler SiteMap.SiteMapResolve, AddressOf Me.ExpandForumPaths

end sub

Public Function ExpandForumPaths(sender As Object, e As SiteMapResolveEventArgs) As SiteMapNode
Dim currentNode As SiteMapNode = SiteMap.CurrentNode.Clone(True)
Dim tempNode As SiteMapNode = currentNode

If tempNode.ParentNode IsNot Nothing Then
tempNode.ParentNode.Url = tempNode.ParentNode.ToString & "?productid=" & LabelProductID.Text 

End If

Return currentNode
End Function

Answer 1

User-939850651 posted

hi peterthegreat,

How to Programmatically Modify Site-Map Nodes in Memory

SiteMapResolve and dynamic site map paths

It seems that you want to use querystring to build dynamic nodes. If so, have you read these two articles?

The SiteMapResolve event is the one to use, but it has some fatal flaws. And the SiteMapResolve is a static method and should never be attached in the page unless it is also unattached in the page.

Hope this can help you.

Best regards,

Xudong Peng

Answer 2

User1909155429 posted

I am trying to implement solution and i get error message

Compiler Error Message: BC30149: Class 'myproject_Seller_CustomerReview3' must implement 'Function SiteMapResolve(sender As Object, e As System.Web.SiteMapResolveEventArgs) As System.Web.SiteMapNode' for interface 'ISiteMapResolver'.

Source Error:

Line 7: Partial Class myproject_Seller_CustomerReview3 Line 8: Inherits System.Web.UI.Page Line 9: Implements ISiteMapResolver

my page contains the following code functions:

Interface ISiteMapResolver
Function SiteMapResolve(ByVal sender As Object, ByVal e As SiteMapResolveEventArgs) As SiteMapNode
End Interface

Public Function SiteMapResolve(ByVal sender As Object, ByVal e As SiteMapResolveEventArgs) As SiteMapNode
Dim currentNode As SiteMapNode = SiteMap.CurrentNode.Clone(True)
Dim tempNode As SiteMapNode = currentNode

If tempNode.ParentNode IsNot Nothing Then
tempNode.ParentNode.Url = tempNode.ParentNode.Url & "?productid=" & ViewState("ProductID").ToString

End If

Return currentNode

End Function

Answer 3

User-939850651 posted

Hi peterthegreat,

I created a simple example, using Session to save querystring, please refer to the following code:

Class SurroundingClass
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
        If IsPostBack = False Then

            If Request.QueryString("ProductId") IsNot Nothing Then
                Response.Write(Request.QueryString("ProductId").ToString())
            End If

            SiteMap.SiteMapResolve += AddressOf Me.ExpandForumPaths
        End If
    End Sub

    Public Function ExpandForumPaths(ByVal sender As Object, ByVal e As SiteMapResolveEventArgs) As SiteMapNode
        Dim currentNode As SiteMapNode = SiteMap.CurrentNode.Clone(True)
        Dim tempNode As SiteMapNode = currentNode
        If tempNode.ParentNode IsNot Nothing Then tempNode.ParentNode.Url = tempNode.ParentNode.Url.ToString() & "?productid=" + HttpContext.Current.Session("ProductId").ToString()
        Return currentNode
    End Function
End Class

<?xml version="1.0" encoding="utf-8" ?>
<siteMap xmlns="http://schemas.microsoft.com/AspNet/SiteMap-File-1.0" >
  <siteMapNode url="MyWeb.aspx" title="home page"  description="">
    <siteMapNode url="MyWeb1.aspx" title="First test page"  description="" />
    <siteMapNode url="MyWeb2.aspx" title="Second test page"  description="" />
  </siteMapNode>
</siteMap>

Result:

If I misunderstand what you mean, could you provide relevant sample code?

Best regards,

Xudong Peng

Answer 4

User1909155429 posted

My problem was i did not know how to resolve this issue with 

 Implements ISiteMapResolver
My page did not recognise the statement which is required to run the code?
every time i opened the page and ran the function the querystring value remained the same, it did not update. 
i found the solution but could not implement it because of the reason mention.

Thanks