Silverlight 5：GraphicsDevice 始终为空答案

【问题标题】：Silverlight 5: GraphicsDevice is always nullSilverlight 5：GraphicsDevice 始终为空
【发布时间】：2012-03-01 11:39:07
【问题描述】：

我正在使用 Silverlight 5.0 开发 3D 应用程序。

对我来说System.Windows.Graphics.GraphicsDeviceManager.Current.GraphicsDevice 总是显示null。

这是我的代码

private void DrawingSurface_Loaded(object sender, RoutedEventArgs e)
    {
        if (GraphicsDeviceManager.Current.RenderMode != RenderMode.Hardware)
        {
            if (GraphicsDeviceManager.Current.RenderModeReason == RenderModeReason.SecurityBlocked)
            {
                throw new  Exception();
            }
        }


        GraphicsDevice device = System.Windows.Graphics.GraphicsDeviceManager.Current.GraphicsDevice;

        _vertexBuffer = StreamHelper.ToMesh(device, "cube.obj");

        _effect = new BasicEffect(GraphicsDeviceManager.Current.GraphicsDevice);
        _effect.Texture = StreamHelper.ToTexture2D(device, "Tulips.jpg");
        _effect.TextureEnabled = true;
        _effect.World = Matrix.Identity;
        _effect.View = Matrix.CreateLookAt(new Vector3(5.0f, 5.0f, 5.0f), Vector3.Zero, Vector3.Up);
        _effect.Projection = Matrix.CreatePerspectiveFieldOfView(MathHelper.PiOver4, 1.667f, 1.0f, 10.0f);
    }

谁能帮帮我。

【问题讨论】：

标签： silverlight silverlight-5.0

【解决方案1】：

您是否允许使用 3D 图形？如果不运行 Silverlight.Configuration.exe（对我来说它位于“C:\Program Files (x86)\Microsoft Silverlight\5.0.61118.0\”中）并选择权限选项卡。那里允许 3D 图形。

【讨论】：

【解决方案2】：

您可能需要检查其他一些 GraphicsDeviceManager.Current.RenderModeReason 值。正如这篇文章中所讨论的那样：http://blogs.msdn.com/b/eternalcoding/archive/2011/10/18/some-reasons-why-my-3d-is-not-working-with-silverlight-5.aspx

【讨论】：