Save all media in Umbraco 8

SaveMediaController.cs

using System.Web.Http;
using Umbraco.Core.Services;
using Umbraco.Web.WebApi;

namespace Yoyo.Elevator.Core.Controllers
{
	public class SaveMediaController : UmbracoApiController
	{
		private readonly IMediaService _mediaService;

		public SaveMediaController(IMediaService mediaService)
		{
			_mediaService = mediaService;
		}

		[HttpGet]
		// /umbraco/api/savemedia/save
		public void Save()
		{
			var rootMedia = _mediaService.GetRootMedia();

			foreach (var media in rootMedia)
			{
				_mediaService.Save(media);

				var descendants = _mediaService.GetPagedDescendants(media.Id, 0, int.MaxValue, out long totalRecords);

				foreach (var descendant in descendants)
				{
					_mediaService.Save(descendant);
				}
			}
		}
	}
}