Issue # 1 - Trying to render Display folders containing
If you've used the Gallery addon
for Umbraco from Designit, and
tried to display a Media folder that contains other folders, no
doubt you've come across this message before:
Object reference not set to an instance of an
An unhandled exception occurred during the execution of the current
web request. Please review the stack trace for more information
about the error and where it originated in the code.
Exception Details: System.NullReferenceException:
Object reference not set to an instance of an object.
The reason for this is that the code assumes that all Media
items in the selected folder are Images, and doesn't do anything to
filter out other items.
The solution is to add the following code snippet in the
the repImages_ItemDataBound event handler
if (currentImage.ContentType.Alias != "Image")
e.Item.Visible = false;
var currentImage = (Media)e.Item.DataItem;
included in the page
The most common mistake that results in the Gallery not working
as expected (ie, clicking on an image brings up the Lightbox) is to
do with missing server-side form tags from your Master page.
Make sure you include the form element on as it's required by
ASP.Net to register client side scripts properly:
<form runat="server" id="form1">
More information about this problem can be found here:
"The client-side script is emitted
just after the opening tag of the Page object's
<form runat= server> element. The script block is emitted as
the object that renders the output is defined, so you must include
both tags of the <script> element."
While you are at it, do yourself a favour and make sure your
head tag includes the runat="server" attribute as well. The
Gallery package looks for the head tag and creates a new css link
to include the lighbox css file.
Hope this helps you out, the second issue in particular was
causing me grief before I finally turned to Microsoft's
documentation, - I had some sites that would work, but others
wouldn't. It finally clicked that those that worked without