我正在使用Linphone实现视频通话。我可以在手机中捕捉摄像头，并在应用程序中显示视频预览。但我需要在客户端摄像头中捕捉视频的预览。我通过纹理视图捕捉视频。这是我的纹理视图代码，我在其中显示我的摄像头

async Task PrepareSession()
    {
        IsBusy = true;
     
        try
        {
            CloseSession();
            sessionBuilder = device.CreateCaptureRequest(cameraTemplate);

            List<Surface> surfaces = new List<Surface>();
            if (texture.IsAvailable && previewSize != null)
            {
                LinearLayout fl = new LinearLayout(this.Context);
                ViewGroup.LayoutParams lparams = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MatchParent, ViewGroup.LayoutParams.WrapContent);
                fl.LayoutParameters = lparams;

                displayCamera = new TextureView(this.Context);
                ViewGroup.LayoutParams dparams = new ViewGroup.LayoutParams(100, 100);
                displayCamera.LayoutParameters = dparams;

                captureCamera = new TextureView(this.Context);
                ViewGroup.LayoutParams cparams = new ViewGroup.LayoutParams(100, 100);
                captureCamera.LayoutParameters = cparams;

                fl.AddView(displayCamera);
                fl.AddView(captureCamera);
             
                var texture = this.texture.SurfaceTexture;
                texture.SetDefaultBufferSize(previewSize.Width, previewSize.Height);
                               
                Core.VideoDisplayEnabled = true;
                Core.VideoCaptureEnabled = true;
                Core.NativeVideoWindowId = displayCamera.Handle;
                Core.NativePreviewWindowId = captureCamera.Handle;

              
                Surface previewSurface = new Surface(texture);
                surfaces.Add(previewSurface);
                sessionBuilder.AddTarget(previewSurface);
                
            }

这是Linphone代码，通过它他们显示客户端摄像头的视频预览。

TextureView captureCamera;
LinearLayout fl = new LinearLayout(this);
            ViewGroup.LayoutParams lparams = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MatchParent, ViewGroup.LayoutParams.WrapContent);
            fl.LayoutParameters = lparams;         
            captureCamera = new TextureView(this);
            ViewGroup.LayoutParams cparams = new ViewGroup.LayoutParams(320, 240);
            captureCamera.LayoutParameters = cparams;
            fl.AddView(captureCamera);
            app.getLayoutView().Children.Add(fl);
            app.Core.NativePreviewWindowId = captureCamera.Handle;
            app.Core.VideoCaptureEnabled = true;

我已经尝试了以下代码组合

Core.NativeVideoWindowId = texture.Handle;

我得到的对象找不到异常的Core.NativeVideoWindowId。我如何可以添加视频预览直接在布局中，并简单地得到它的ID。我已经通过了以下链接。
https://github.com/BelledonneCommunications/linphone-xamarin
How to show a textureview through stacklayout in xamarin forms?
https://gitlab.linphone.org/BC/public/tutorials
我不知道怎么解决这个问题。有什么建议吗？