get all media from a folder

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Andrew 25 posts 148 karma points

Jun 06, 2019 @ 14:24

1

Get all Media from a Folder

Hi,

I'm trying to get images from a folder I've set up in the Media section.

I'm using Umbraco.MediaAtRoot() which is returning the root media correctly, however when trying to access the media in a folder (using .Children) I'm getting the following Error:

'Object Reference not set to an instance of an object'

The stacktrace is as follows:

Umbraco.Web.PublishedCache.NuCache.PublishedContent.<>c.<.cctor>b931(IPublishedSnapshot publishedShapshot, Boolean previewing, Int32 id)\r\n at Umbraco.Web.PublishedCache.NuCache.PublishedContent.19.MoveNext()\r\n at System.Linq.Buffer1..ctor(IEnumerable1 source)\r\n at System.Linq.OrderedEnumerable1.<GetEnumerator>d__1.MoveNext()\r\n at System.Linq.SystemCore_EnumerableDebugView1.getItems()

Does anyone know what is causing this error and how it can be resolved? Or is there a better way to achieve what I am trying to do? It feels like something that should be fairly simple so not sure if I'm missing something ...

Thanks,

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Ifrahim Rasool 28 posts 84 karma points

Jun 06, 2019 @ 14:53
1
Why dont you create instance of MediaService and se GetRootMedia() function to get your Media folder by name and use .Children to fetch all images.

Something like:
```
        var _mediaService = ApplicationContext.Services.MediaService;
        var _mediaFolder = (IPublishedContent)_mediaService.GetRootMedia().FirstOrDefault(x => x.Name.InvariantEquals("MyImages"));
```
Hope that helps.
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Rhys Hamilton 140 posts 942 karma points

Jun 06, 2019 @ 15:29

0

Hi Andrew,

Could you share the full code that you're using to retrieve your folder? It might give a better understanding of what's going wrong.

Similarly, you can also see my solution here in how to retrieve children from a media folder (using a media picker in V8).

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David Armitage 510 posts 2081 karma points

Jul 13, 2021 @ 06:39

Hi,

Here is some code that I use to get a child media folder. I think you will find this useful.

I am not sure if it is the most efficient way but it works for me.

I tried to go down the Lucene path but didn't get very far.

 public IMedia GetMediaFolder(int parentFolderId, string folderName)
        {
            try
            {
                IMedia parentFolder = _mediaService.GetById(parentFolderId); ;
                if(parentFolder != null)
                    return _mediaService.GetPagedChildren(parentFolder.Id, 0, int.MaxValue, out long total).FirstOrDefault(x => x.Name == folderName);
            }
            catch (Exception e)
            {
                _logger.Error<UmbMediaService>("GetMediaFolder | Exception: {0} | Message: {1}", e.InnerException != null ? e.InnerException.ToString() : "", e.Message != null ? e.Message.ToString() : "");
            }

            return null;
        }

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Patrick de Mooij 73 posts 623 karma points MVP 3x c-trib

Jul 13, 2021 @ 07:10

Quick note about this logic. While this will work, it'll also do database hits due to using the MediaService. So this is not recommended if you are doing this a lot.

If you don't need to have the IMedia item, I suggest getting it from the Umbraco Cache:

public IPublishedContent GetMediaFolder(int parentFolderId, string folderName)
    {
        try
        {
            var parentFolder = Umbraco.Media(parentFolderId);
            if (parentFolder != null)
                return parentFolder.Children().FirstOrDefault(x => x.Name == folderName);
        }
        catch (Exception e)
        {
            _logger.Error<UmbMediaService>("GetMediaFolder | Exception: {0} | Message: {1}", e.InnerException != null ? e.InnerException.ToString() : "", e.Message != null ? e.Message.ToString() : "");
        }

        return null;
    }

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