handler.cs

private void FrameArrived(object sender, MultiSourceFrameArrivedEventArgs e)
{
    bool multiSourceFrameProcessed = false;
    bool colorFrameProcessed = false;
    bool depthFrameProcessed = false;
    bool bodyIndexFrameProcessed = false;
    
    MultiSourceFrame multiSourceFrame = e.FrameReference.AcquireFrame();
    if (multiSourceFrame != null)
    {
        using (DepthFrame depthFrame = multiSourceFrame.DepthFrameReference.AcquireFrame())                
        using (ColorFrame colorFrame = multiSourceFrame.ColorFrameReference.AcquireFrame())
        using (BodyIndexFrame bodyIndexFrame = multiSourceFrame.BodyIndexFrameReference.AcquireFrame())
        {
            if (depthFrame != null)
            {
                FrameDescription depthFrameDescription = depthFrame.FrameDescription;
                // depthBufferはushort[]
                depthFrame.CopyFrameDataToArray(this.depthBuffer);
                depthFrameProcessed = true;
            }
            if (bodyIndexFrame != null)
            {
                FrameDescription bodyFrameDescription = bodyIndexFrame.FrameDescription;
                // bodyIndexBufferはbyte[]
                bodyIndexFrame.CopyFrameDataToArray(this.bodyIndexBuffer);
                bodyIndexFrameProcessed = true;
            }
            if (colorFrame != null)
            {
                FrameDescription colorFrameDescription = colorFrame.FrameDescription;
                // colorPixelsはbyte[]
                colorFrame.CopyConvertedFrameDataToArray(this.colorPixels, ColorImageFormat.Bgra);
                colorFrameProcessed = true;
            }
            multiSourceFrameProcessed = true;
        }
    }
    if (multiSourceFrameProcessed && depthFrameProcessed && colorFrameProcessed && bodyIndexFrameProcessed)
    {
        // do something
    }
}