我有一个问题如下。我使用 CefSharp offscreen 进行网页自动化如下（我只打开一个相同的页面）： 1. 打开页面并等待它呈现*。2. 使用 EvaluateScriptAsync 我将值放入输入表单，然后使用相同的方法单击网页上的按钮。3.然后这个网页上有一些JS检查结果并显示消息。4. 当消息显示时，我会截屏。**
但是，我有两个问题： * 我的解决方案必须是 Internet 速度证明。当我使用 BrowserLoadingStateChanged 事件和 IsLoading 方法时，即使触发的事件没有完全加载网页 - 当我启动 EavluateScriptAsync 方法时，它会返回错误，因为页面没有完全加载。当然，我可以说 ThreadSleep 之类的东西，但它并不总是有效 - 它在很大程度上取决于您的互联网速度。
** 当我尝试截屏时，它并不总是包含 JS 显示的结果消息 - 有时会出现加载圆圈而不是消息。在这里，我可以再次使用 THreadSleep，但它并不总是有效。
你有什么想法？提前致谢。
private static void BrowserLoadingStateChanged(object sender, LoadingStateChangedEventArgs e)
{
// Check to see if loading is complete - this event is called twice, one when loading starts
// second time when it's finished
// (rather than an iframe within the main frame).
if (!e.IsLoading)
{
// Remove the load event handler, because we only want one snapshot of the initial page.
browser.LoadingStateChanged -= BrowserLoadingStateChanged;
Thread.Sleep(1800); // e. g. but it isn't a solution in fact
var scriptTask = browser.EvaluateScriptAsync("document.getElementById('b-7').value = 'something'");
scriptTask = browser.EvaluateScriptAsync("document.getElementById('b-8').click()");
//scriptTask.Wait();
if (browser.IsLoading == false)
{
scriptTask.ContinueWith(t =>
{
//Give the browser a little time to render
//Thread.Sleep(500);
Thread.Sleep(500); // still not a solution
// Wait for the screenshot to be taken.
var task = browser.ScreenshotAsync();
task.ContinueWith(x =>
{
// Make a file to save it to (e.g. C:\Users\jan\Desktop\CefSharp screenshot.png)
var screenshotPath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Desktop), "CefSharp screenshot.png");
Console.WriteLine();
Console.WriteLine("Screenshot ready. Saving to {0}", screenshotPath);
// Save the Bitmap to the path.
// The image type is auto-detected via the ".png" extension.
task.Result.Save(screenshotPath);
// We no longer need the Bitmap.
// Dispose it to avoid keeping the memory alive. Especially important in 32-bit applications.
task.Result.Dispose();
Console.WriteLine("Screenshot saved. Launching your default image viewer...");
// Tell Windows to launch the saved image.
Process.Start(screenshotPath);
Console.WriteLine("Image viewer launched. Press any key to exit.");
}, TaskScheduler.Default);
});
}
}
}