c# - 面板背景图像闪烁

Question

我有一个 Panel 来填充父表单。
我使用了一个定时器来捕捉屏幕，
并定期将截图设置为Panel的背景图。

然而，它遇到了疯狂的闪烁。我能做些什么来解决它？

//Part of code
 public partial class Form1 : Form
    {

        DxScreenCapture sc = new DxScreenCapture();

        public Form1()
        {
            InitializeComponent();

            panelMain.BackgroundImageLayout = ImageLayout.Zoom;
         }

        private void Form1_Load(object sender, EventArgs e)
        {
        }



        void RefreshScreen()
        {
            Surface s = sc.CaptureScreen();

            DataStream ds = Surface.ToStream(s, ImageFileFormat.Bmp);
            panelMain.BackgroundImage = Image.FromStream(ds);

            s.Dispose();
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            RefreshScreen();

        }
    }

Answer 1

尝试使用双缓冲面板。继承面板，将 DoubleBuffered 设置为 true 并使用该面板而不是默认面板:

    namespace XXX
    {
        /// <summary>
        /// A panel which redraws its surface using a secondary buffer to reduce or prevent flicker.
        /// </summary>
        public class PanelDoubleBuffered : System.Windows.Forms.Panel
        {
            public PanelDoubleBuffered()
                : base()
            {
                this.DoubleBuffered = true;
            }
        }
    }

编辑

此外，我想鼓励您多注意一下您使用的资源。每当一个对象实现了 IDisposable 接口(interface)时——当不再需要时释放该对象。这在处理流等非托管资源时非常重要!

    void RefreshScreen()
    {
            using (Surface s = sc.CaptureScreen())
            {
                using (DataStream ds = Surface.ToStream(s, ImageFileFormat.Bmp))
                {
                    Image oldBgImage = panelMain.BackgroundImage;
                    panelMain.BackgroundImage = Image.FromStream(ds);
                    if (oldBgImage != null)
                        oldBgImage.Dispose();
                }
            }
    }