xmlns:camPlayer="clr-namespace:CatenaLogic.Windows.Presentation.WebcamPlayer"

<camPlayer:CapPlayer x:Name="camPlayer"  RenderTransformOrigin="0.5,0.5" ><camPlayer:CapPlayer.RenderTransform><TransformGroup><ScaleTransform ScaleY="-1" ScaleX="1"/><SkewTransform AngleY="0" AngleX="0"/><RotateTransform Angle="0"/><TranslateTransform/></TransformGroup></camPlayer:CapPlayer.RenderTransform></camPlayer:CapPlayer>

public ImageSource imgSource        {get { return (ImageSource)GetValue(imgSourceProperty); }set { SetValue(imgSourceProperty, value); }        }

public static readonly DependencyProperty imgSourceProperty =            DependencyProperty.Register("imgSource", typeof(ImageSource), typeof(CopCamPlayer), null);

private void UserControl_Loaded(object sender, RoutedEventArgs e)        {                        camPlayer.Device = new CapDevice();            camPlayer.Device.MonikerString = CapDevice.DeviceMonikers[0].MonikerString;//设置通过哪个设备                    }

//拍照片        public void CaptureImage()        {            imgSource = camPlayer.CurrentBitmap;        }             

//停止摄像头占用        private void UserControl_Unloaded(object sender, RoutedEventArgs e)        {            camPlayer.Device.Stop();             GC.Collect(); //回收垃圾，不然停止不了占用                 }

<Grid x:Name="圆形按钮" Height="56" Margin="0,0,335.333,119" VerticalAlignment="Bottom" HorizontalAlignment="Right" Width="59.333"><i:Interaction.Triggers><i:EventTrigger EventName="MouseLeftButtonDown"><ei:CallMethodAction TargetObject="{Binding ElementName=copCamPlayer}" MethodName="CaptureImage"/></i:EventTrigger></i:Interaction.Triggers></Grid><Image HorizontalAlignment="Right" Margin="0,250,67.5,163" Width="242" Source="{Binding imgSource, ElementName=copCamPlayer}"/>