MonoGame.Extended/Source/MonoGame.Extended/Content/ContentManagerExtensions.cs

using System.IO;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Content;
using Microsoft.Xna.Framework.Graphics;

namespace MonoGame.Extended.Content
{
    public static class ContentManagerExtensions
    {
        public const string DirectorySeparatorChar = "/";

        public static Stream OpenStream(this ContentManager contentManager, string path)
        {
            return TitleContainer.OpenStream(contentManager.RootDirectory + DirectorySeparatorChar + path);
        }

        public static GraphicsDevice GetGraphicsDevice(this ContentManager contentManager)
        {
            // http://konaju.com/?p=21
            var serviceProvider = contentManager.ServiceProvider;
            var graphicsDeviceService = (IGraphicsDeviceService) serviceProvider.GetService(typeof(IGraphicsDeviceService));
            return graphicsDeviceService.GraphicsDevice;
        }
    }
}