Monogame android：如何从流或网络服务加载 XNB 模型？答案

【问题标题】：Monogame android: How to load XNB model from stream or web service?Monogame android：如何从流或网络服务加载 XNB 模型？
【发布时间】：2015-10-23 00:26:05
【问题描述】：

我正在为 Xamarin Android 项目开发 Monogame。任何人都知道如何加载从 Web 服务创建的 XNB 模型？基本上我的网络服务将返回一个 XNB 文件，Android 设备应该能够获取该文件以立即显示 3D 模型。我知道如何从 Assets Content 文件夹加载静态 XNB 模型，但不知道如何从流或外部 Web 服务加载它，如下所示：

protected override void LoadContent()
{            
     spriteBatch = new SpriteBatch(GraphicsDevice);
     myModel = Content.Load<Model>("http://mywebservice.com/getXNBModel/1/");
}

【问题讨论】：

标签： c# android monogame

【解决方案1】：

我最终创建了从 ContentManager 派生的新类：

class XNBContentManager : ContentManager
{
        class FakeGraphicsService : IGraphicsDeviceService
        {   
            public FakeGraphicsService(GraphicsDevice graphicDevice)
            {
                GraphicsDevice = graphicDevice;
            }

            public GraphicsDevice GraphicsDevice { get; private set; }

#pragma warning disable 67
            public event EventHandler<EventArgs> DeviceCreated;
            public event EventHandler<EventArgs> DeviceDisposing;
            public event EventHandler<EventArgs> DeviceReset;
            public event EventHandler<EventArgs> DeviceResetting;
#pragma warning restore 67
        }

        class FakeServiceProvider : IServiceProvider
        {
            GraphicsDevice _graphicDevice;
            public FakeServiceProvider(GraphicsDevice graphicDevice)
            {
                _graphicDevice = graphicDevice;
            }

            public object GetService(Type serviceType)
            {
                if (serviceType == typeof(IGraphicsDeviceService))
                    return new FakeGraphicsService(_graphicDevice);

                throw new NotImplementedException();
            }
        }

        private readonly MemoryStream _xnbStream;

        public XNBContentManager(MemoryStream xnbStream, GraphicsDevice graphicDevice)
            : base(new FakeServiceProvider(graphicDevice), "Content")
        {
            _xnbStream = xnbStream;
        }

        protected override Stream OpenStream(string assetName)
        {
            return new MemoryStream(_xnbStream.GetBuffer(), false);
        }
 }

然后在LoadContent方法中使用：

protected override void LoadContent()
{
    spriteBatch = new SpriteBatch(GraphicsDevice);
    var content = new XNBContentManager(_xnbStream, this.GraphicsDevice);
    myModel = content.Load<Model>("WhateverName");
}

【讨论】：