Unable to cast object (after upgrade to R2)

Jonas Boman

Vote:

After upgrading to R2 I'm getting errors in PageList when casting from PageBase to custom PageType (created with PageTypeBuilder).

<a href="<%# ((Article)Container.DataItem).LinkURL %>">
         <%# shortenIngress(((Article)Container.DataItem).Ingress, 400)%>
</a>

[InvalidCastException: Unable to cast object of type 'EPiServer.Core.PageData' to type 'Site.Web.Templates.Public.PageTypes.Article'.]
   ASP.templates_public_pages_newsroom_aspx.__DataBind__control4(Object sender, EventArgs e) in c:\projects\Site\Templates\Public\Pages\NewsRoom.aspx:25
   System.Web.UI.Control.OnDataBinding(EventArgs e) +132

The PageType is inheriting from PageData.

Any ideas in resolving the issue?

#54811

Nov 03, 2011 16:42

Joshua Folkerts

Vote:

you, you need to use PageTypeBuilder to do this from my experience

(Article)PageTypeBuilder.PageTypeResolver.Instance.ConvertToTyped((PageData)Container.DataItem)

#54812

Nov 03, 2011 21:45

Jonas Boman

Vote:

Gaaah, works on some but not on others.

Thanks Joshua. Error handling...

#54825

Nov 04, 2011 14:22

Joshua Folkerts

Vote:

Do all the pagetypes inherit from typed page data. or is container.DataItem null. that could be an issue since it can't cast to type Pagedata

#54826

Nov 04, 2011 15:04

Jonas Boman

Vote:

Yes, they do inherit from Pagedata, through base classes.

The DataItem should not be null. It all worked before the upgrade to R2

#54827

Nov 04, 2011 15:10

Joshua Folkerts

Vote:

What is the error that you are recieving now

#54828

Nov 04, 2011 15:11

Jonas Boman

Vote:

<EPiServer:PageList runat="server" ID="ConnectedArticles">
                <ItemTemplate>
                    <div class="post">
                        <div class="heading">
                            <h3>
                                <EPiServer:Property ID="Property3" runat="server" PropertyName="PageLink" />
                            </h3>
                        </div> 
                        <p class="timestamp"><%# ReturnPublishDate((EPiServer.Core.PageData)Container.DataItem)%> | 
                        <%# GetCategoryName((EPiServer.Core.PageData)Container.DataItem)%></p>

                        <div class="mainBody ingress">
                            <p><%# ReturnIngress((Article)PageTypeBuilder.PageTypeResolver.Instance.ConvertToTyped((EPiServer.Core.PageData)Container.DataItem))%></p>
                        </div>
                    </div>
                </ItemTemplate>
            </EPiServer:PageList>

Actually this PageList works - no errors, but it would be better using a method converting to correct page type or using code behind instead of the page(view).

#54829

Nov 04, 2011 15:18

Joshua Folkerts

Vote:

Weird, i have used this on all my 6r2 projects and it works. Is it something maybe that isn't of type article. I haven't ran into that issue.

I wrote an extension method for passing in data item and returns the type instead of that long chain of code. data.Get<Article>() returns article page.

#54830

Nov 04, 2011 15:23

Jonas Boman

Vote:

Yepp, got some help from Joel Abrahamson and trying out with the AsTyped extension.

.AsTyped() when getting a PageCollection solved it.
PageDataCollection pdc = DataFactory.Instance.FindPagesWithCriteria(pageLink, criterias).AsTyped();

Thank you for your help, Joshua,

#54832

Edited, Nov 04, 2011 16:01