Hello,

   I am experimenting with the navigation tools, and at this point I'm trying to get the breadcrumb control to update based on the querystring.

I made this function.

Private Function ShowCurrentnode(ByVal sender As Object, ByVal e As SiteMapResolveEventArgs) As SiteMapNode

Dim currentnode As SiteMapNode = SiteMap.CurrentNode.Clone(True)

Dim tempnode As SiteMapNode = currentnode

tempnode.Title = objcategory.Title

Return currentnode

End Function

call this in the pageload event

If Not Page.IsPostBack Then

If Not Request.QueryString("id") Is Nothing Then

objcategory = adaptercontentcats.GetDataByID(Request.QueryString("id"))(0)

End If

End If

AddHandler SiteMap.SiteMapResolve, AddressOf Me.ShowCurrentnode

 

and it works once...  After that, the breadcrumb "sticks" to whatever the first load was, never calling the sitemapresolve event again. 

Can anyone look at my code and tell me what I'm doing wrong?

 

Thank you in advance,

The SiteMapProvider is global to your entire application, not an instance based on the request.  That means that any SiteMapResolve handlers are applied to every request as soon as they are set up.  The best place for code like this is in Global.asax.  Take a look at the sample in the "Personal WebSite Starter Kit". 
--
Danny

That worked great for me Danny!  I guess I should probably stop looking in what apparantly are outdated MSDN articles and focus more on tearing apart the sample applications. :)

Now I do worry about this sort of scenario because if I want to convert a portion of the querystring  into a new breadcrumb title, then it means another database call (one in the global sitemapresolve event and another in the page).  Is there a better way to pass this sort of information back and forth? 

Richard,
  It sounds like you have a url that is:  mypage.aspx?a=b&c=d and, a title "my page", and you would like, for example, to have the title say:  "my page: b"  where b comes from the query string.  Currently you are using a DB access to requery the value for b?  In thise case, I think you could use templating kind of like this...

Thats exactly what I'm doing, I didn't know I could template the sitemappath like that, thats awesome.  Too many new things in asp.net 2.0 not enough spare learning time to thoroughly go through each one. :)

Ok, Hopefully last thing and not sure if its possible in an efficient manner.

I'm using URL Rewriting to convert /content/4.aspx into

/content.aspx?id=4

Using the sitenode template I can pull my content object from my database just once and assign the proper title for that ID along with all the formatting and content with just 1 database pull.  This creates something like: Home > Caesars Palace Hotel and Casino

Is it possible to create a dynamic site hierarchy with just 1 database pull?  In other words, I'd like it to look like: Home > Las Vegas > Caesars Palace Hotel and Casino

 Now I can see how to add nodes in the global.asax (which would require a second database pull), or I could just alter my function to output a link going to the content category plus the ">" plus the content title, but basically I'm asking if there is a best practices way of doing this I should be aware of.