Hi Dave,

I had exactly same problem. I did check in Umbraco core code to see how it is working in other sides. Then I found with some tweak it can be done. I release my findings as a package. Please check this and see if it helps you?

Thanks

Regards, Pasang

Thanks for your reply. When I click on the link I get a 'package not found' message. In the end, for the site I was building, I just reworked the setup and didn't use the macro approach. Thanks again for your reply.

Simply add the following anywhere in your project

using Umbraco.Core;
using Umbraco.Core.Logging;
using Umbraco.Core.PropertyEditors;

namespace Umbraco.Web.PropertyEditors
{
    [DataEditor("Umbraco.MultipleMediaPicker", EditorType.MacroParameter,
        "Multiple Media Picker", "mediapicker", ValueType = ValueTypes.Text, Group = "media", Icon = Constants.Icons.MediaImage)]
    public class MultipleMediaPickerPropertyEditor : DataEditor
    {
        public MultipleMediaPickerPropertyEditor(ILogger logger)
            : base(logger)
        { }

        protected override IConfigurationEditor CreateConfigurationEditor() => new MultipleMediaPickerConfigurationEditor();
    }

    public class MultipleMediaPickerConfigurationEditor : MediaPickerConfigurationEditor
    {
        public override object DefaultConfigurationObject => new MediaPickerConfiguration()
        {
            Multiple = true
        };
    }
}

You can change other default config values by changing more of the MediaPickerConfiguration properties in the MultipleMediaPickerConfigurationEditor class

All of the properties available can be seen here:

https://github.com/umbraco/Umbraco-CMS/blob/v8/dev/src/Umbraco.Web/PropertyEditors/MediaPickerConfiguration.cs

The benefit of defining the property editor programatically (as opposed to a package.manifest) in this instance is that we're able to specify it to only be a macro parameter by only setting its type to EditorType.MacroParameter.

That means it will not show up in the list of available property editors when adding or editing a data type and only show up when adding a macro parameter.

Many thanks!

Just a heads up, I changed the alias for the property editor to "Umbraco.MultipleMediaPicker" which is the same as it was in v7 (ref).

That way if Umbraco is updated to officially re-add it with its original alias you wont have to change your macros again (you would have to remove the hotfix code though, otherwise you'll get a YSOD complaining about two property editors having the same alias).

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