Accessing a Shared Content Item Via User Control (VB.NET) - Sitefinity - Bugs & Issues

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Posted by Community Admin on 06-Jul-2011 00:00

So I'm not sure if this is a user problem or a bug, but I'm having a few problems getting this example: http://www.sitefinity.com/40/help/developers-guide/sitefinity-essentials-modules-generic-content-querying-content-items.html to work.
I used a couple of C# to VB converts to just make sure it was converted fine, so this is my first version of the code:

Public Function FindGenericContent(ByVal contentItemTitle As String, ByVal contentToSearch As String) As ContentItem

Dim manager As ContentManager = ContentManager.GetManager()

Dim contentItem As ContentItem = manager.GetContent().Where(Function(t) t.Title = contentItemTitle).Where(Function(t) t.Status = ContentLifecycleStatus.Live).[Single]() '.Where(Function(t) t.Content.Contains(contentToSearch))

Return contentItem

End Function

With this I get;
Compiler Error Message: BC30518: Overload resolution failed because no accessible 'Where' can be called with these arguments: Extension method 'Public Function Where(predicate As System.Linq.Expressions.Expression(Of System.Func(Of Telerik.Sitefinity.GenericContent.Model.ContentItem, Integer, Boolean))) As System.Linq.IQueryable(Of Telerik.Sitefinity.GenericContent.Model.ContentItem)' defined in 'System.Linq.Queryable': Nested function does not have a signature that is compatible with delegate 'System.Func(Of Telerik.Sitefinity.GenericContent.Model.ContentItem, Integer, Boolean)'. Extension method 'Public Function Where(predicate As System.Linq.Expressions.Expression(Of System.Func(Of Telerik.Sitefinity.GenericContent.Model.ContentItem, Boolean))) As System.Linq.IQueryable(Of Telerik.Sitefinity.GenericContent.Model.ContentItem)' defined in 'System.Linq.Queryable': Overload resolution failed because no accessible '=' is most specific for these arguments: 'Public Shared Operator =(a As String, b As String) As Boolean': Not most specific. 'Public Shared Operator =(left As Telerik.Sitefinity.Model.Lstring, right As Telerik.Sitefinity.Model.Lstring) As Boolean': Not most specific. Extension method 'Public Function Where(predicate As System.Func(Of Telerik.Sitefinity.GenericContent.Model.ContentItem, Integer, Boolean)) As System.Collections.Generic.IEnumerable(Of Telerik.Sitefinity.GenericContent.Model.ContentItem)' defined in 'System.Linq.Enumerable': Nested function does not have a signature that is compatible with delegate 'System.Func(Of Telerik.Sitefinity.GenericContent.Model.ContentItem, Integer, Boolean)'. Extension method 'Public Function Where(predicate As System.Func(Of Telerik.Sitefinity.GenericContent.Model.ContentItem, Boolean)) As System.Collections.Generic.IEnumerable(Of Telerik.Sitefinity.GenericContent.Model.ContentItem)' defined in 'System.Linq.Enumerable': Overload resolution failed because no accessible '=' is most specific for these arguments: 'Public Shared Operator =(a As String, b As String) As Boolean': Not most specific. 'Public Shared Operator =(left As Telerik.Sitefinity.Model.Lstring, right As Telerik.Sitefinity.Model.Lstring) As Boolean': Not most specific. Extension method 'Public Function Where(predicate As String, ParamArray values() As Object) As System.Linq.IQueryable(Of Telerik.Sitefinity.GenericContent.Model.ContentItem)' defined in 'Telerik.Sitefinity.Data.Linq.Dynamic.DynamicQueryable': Lambda expression cannot be converted to 'String' because 'String' is not a delegate type. Extension method 'Public Function Where(filterDescriptors As System.Collections.Generic.IEnumerable(Of Telerik.Web.Data.IFilterDescriptor)) As System.Linq.IQueryable' defined in 'Telerik.Web.Data.Extensions.QueryableExtensions': Lambda expression cannot be converted to 'System.Collections.Generic.IEnumerable(Of Telerik.Web.Data.IFilterDescriptor)' because 'System.Collections.Generic.IEnumerable(Of Telerik.Web.Data.IFilterDescriptor)' is not a delegate type. Extension method 'Public Function Where(predicate As System.Linq.Expressions.Expression) As System.Linq.IQueryable' defined in 'Telerik.Web.Data.Extensions.QueryableExtensions': Lambda expression cannot be converted to 'System.Linq.Expressions.Expression' because 'System.Linq.Expressions.Expression' is not a delegate type.

Now this isn't too much of an issue because I found this article:
http://www.sitefinity.com/devnet/forums/sitefinity-4-x/sdk/vb-net.aspx#1443171

so I change t.Title to t.Title.value

Public Function FindGenericContent(ByVal contentItemTitle As String, ByVal contentToSearch As String) As ContentItem

Dim manager As ContentManager = ContentManager.GetManager()

Dim contentItem As ContentItem = manager.GetContent().Where(Function(t) t.Title.Value = contentItemTitle).Where(Function(t) t.Status = ContentLifecycleStatus.Live).[Single]() '.Where(Function(t) t.Content.Contains(contentToSearch))

Return contentItem

End Function

Now I get:

Property 'System.String Value' is not defined for type 'System.String'

I've tried a few different options on converting the title to a string first, but nothing is working. Could you please help.

Thank you in advance.
Byron Boardman

Posted by Community Admin on 08-Jul-2011 00:00

is anyone able to help with this?

Thanks
Regards
Byron Boardman

Posted by Community Admin on 11-Jul-2011 00:00

Hi Byzza,

We are having issues with visual basic and linq expressions. You can check here :
http://www.telerik.com/support/pits.aspx#/public/sitefinity/4981 .

Could you try to use something like this :

From c In ContentManager.GetManager() where c.Title == "Test";

All the best,
Teodor
the Telerik team

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Posted by Community Admin on 13-Jul-2011 00:00

My Linq is fairly non existant at the moment, so could you help me, what should I be replacing?

I tried both

changing this line:

Dim contentItem As ContentItem = manager.GetContent.Where(Function(t) t.Title.Value = contentItemTitle).Where(Function(t) t.Status = ContentLifecycleStatus.Live).[Single]()

Too:

Dim contentItem As ContentItem = From c In manager Where c.title = contentItemTitle

and

Dim contentItem As ContentItem = manager.GetContent.Where(From c In manager Where c.title = contentItemTitle).where(Function(t) t.Status = ContentLifecycleStatus.Live).[single]()

and for both I get the error:
Expression of type 'Telerik.Sitefinity.Modules.GenericContent.ContentManager' is not queryable. Make sure you are not missing an assembly reference and/or namespace import for the LINQ provider.

Note:
manager:

Dim manager As ContentManager = ContentManager.GetManager()

Posted by Community Admin on 18-Jul-2011 00:00

Hello Byzza,

At the moment we are having issues with visual basic and linq expressions. Here a PITS issue is logged :
http://www.telerik.com/support/pits.aspx#/public/sitefinity/4981 .

Will need more time to investigate and fix the problem with VB.

Sorry for inconvenience!

Best wishes,
Milena
the Telerik team

This thread is closed