在线程中执行Webbrowser控件的屏幕视图

我正在使用中显示的技术

WebBrowser控件在一个新的线程

尝试获取网页的屏幕截图我已经能够获得下面的代码，当WebBrowser控件放置在WinForm上成功工作。 但是，在线程中运行时，它会提供桌面的任意图像，从而失败。

 Thread browserThread = new Thread(() => { WebBrowser br = new WebBrowser(); br.DocumentCompleted += webBrowser1_DocumentCompleted; br.ProgressChanged += webBrowser1_ProgressChanged; br.ScriptErrorsSuppressed = true; br.Navigate(url); Application.Run(); }); browserThread.SetApartmentState(ApartmentState.STA); browserThread.Start(); private Image TakeSnapShot(WebBrowser browser) { int width; int height; width = browser.ClientRectangle.Width; height = browser.ClientRectangle.Height; Bitmap image = new Bitmap(width, height); using (Graphics graphics = Graphics.FromImage(image)) { Point p = new Point(0, 0); Point upperLeftSource = browser.PointToScreen(p); Point upperLeftDestination = new Point(0, 0); Size blockRegionSize = browser.ClientRectangle.Size; blockRegionSize.Width = blockRegionSize.Width - 15; blockRegionSize.Height = blockRegionSize.Height - 15; graphics.CopyFromScreen(upperLeftSource, upperLeftDestination, blockRegionSize); } return image; } 

这显然是由于Graphics.CopyFromScreen()方法，但我不知道任何其他方法。 有没有办法解决这个问题，任何人都可以build议？ 或者是我唯一的select创build一个窗体，添加控件，使其可见，然后屏幕刮？ 出于显而易见的原因，我希望避免这种做法。

Answer 1

你可以写

 private Image TakeSnapShot(WebBrowser browser) { browser.Width = browser.Document.Body.ScrollRectangle.Width; browser.Height= browser.Document.Body.ScrollRectangle.Height; Bitmap bitmap = new Bitmap(browser.Width - System.Windows.Forms.SystemInformation.VerticalScrollBarWidth, browser.Height); browser.DrawToBitmap(bitmap, new Rectangle(0, 0, bitmap.Width, bitmap.Height)); return bitmap; } 

完整的工作代码

 var image = await WebUtils.GetPageAsImageAsync("http://www.stackoverflow.com"); image.Save(fname , System.Drawing.Imaging.ImageFormat.Bmp); 

---

 public class WebUtils { public static Task<Image> GetPageAsImageAsync(string url) { var tcs = new TaskCompletionSource<Image>(); var thread = new Thread(() => { WebBrowser browser = new WebBrowser(); browser.Size = new Size(1280, 768); WebBrowserDocumentCompletedEventHandler documentCompleted = null; documentCompleted = async (o, s) => { browser.DocumentCompleted -= documentCompleted; await Task.Delay(2000); //Run JS a few seconds more Bitmap bitmap = TakeSnapshot(browser); tcs.TrySetResult(bitmap); browser.Dispose(); Application.ExitThread(); }; browser.ScriptErrorsSuppressed = true; browser.DocumentCompleted += documentCompleted; browser.Navigate(url); Application.Run(); }); thread.SetApartmentState(ApartmentState.STA); thread.Start(); return tcs.Task; } private static Bitmap TakeSnapshot(WebBrowser browser) { browser.Width = browser.Document.Body.ScrollRectangle.Width; browser.Height= browser.Document.Body.ScrollRectangle.Height; Bitmap bitmap = new Bitmap(browser.Width - System.Windows.Forms.SystemInformation.VerticalScrollBarWidth, browser.Height); browser.DrawToBitmap(bitmap, new Rectangle(0, 0, bitmap.Width, bitmap.Height)); return bitmap; } } 

Answer 2

 using (Graphics graphics = Graphics.FromImage(image)) { Point p = new Point(0, 0); Point upperLeftSource = browser.PointToScreen(p); Point upperLeftDestination = new Point(0, 0); Size blockRegionSize = browser.ClientRectangle.Size; blockRegionSize.Width = blockRegionSize.Width - 15; blockRegionSize.Height = blockRegionSize.Height - 15; graphics.CopyFromScreen(upperLeftSource, upperLeftDestination, blockRegionSize); } 

你真的需要使用声明吗？

您也可以return image但复制的图像如何分配给它？