我正在使用Silverlight 5构建一个3D应用程序.我有一个调用方法的DrawingSurface.但是,当我向我的XAML添加导航：Frame时,我会抛出一个错误.
这是有问题的方法：
private void DrawingSurface_Draw(object sender,DrawEventArgs e)
{
GraphicsDevice device = GraphicsDeviceManager.Current.GraphicsDevice;
device.Clear(ClearOptions.Target | ClearOptions.DepthBuffer,new Microsoft.Xna.Framework.Color(0,0),10.0f,0);
device.SetVertexBuffer(_vertexBuffer);
device.SetVertexShader(_vertexShader);
device.SetPixelShader(_pixelShader);
device.Textures[0] = _texture;
device.SamplerStates[0] = SamplerState.LinearClamp;
device.DrawPrimitives(PrimitiveType.TriangleList,_vertexBuffer.VertexCount / 3);
device.SetVertexShaderConstantFloat4(0,ref _viewProjection);
e.InvalidateSurface();
}
错误发生在line device.DrawPrimitives(PrimitiveType.TriangleList,_vertexBuffer.VertexCount / 3); .错误是“NullReferenceException未被用户代码处理”.没有导航就不会发生：框架.
