我正在使用CEFsharp浏览器并确定使用LoadingStateChanged事件加载页面,但它会多次触发。
我只需要在页面完全加载后才能触发它,怎么办呢?
private async void Browser_LoadingStateChanged(object sender, LoadingStateChangedEventArgs e)
{
if (!e.Browser.IsLoading)
{
await Task.Run(async () =>
{
await Task.Delay(3000);
});
try
{
MessageBox.Show("Page has been loaded");
}
catch (Exception ex)
{
}
}
}
答案 0 :(得分:2)
这几天真的很简单。例如,将以下两行代码放在您的Form_Load中:
browser = new ChromiumWebBrowser();
(browser).FrameLoadEnd += Browser_FrameLoadEnd;
然后添加所需的方法:
async void Browser_FrameLoadEnd(object sender, FrameLoadEndEventArgs e)
{ // Jumps in here when the page is fully loaded:
if (e.Frame.IsMain)
{
if (e.Url.Contains("whatever you need"))
{
// Call a methode or something else.
}
}
}
答案 1 :(得分:0)
此事件的多次触发是一个已知问题,并且是Chromium Embedded Framework(CEF)的一部分,而不是cefSharp。
(github cefsharp回复) https://github.com/cefsharp/CefSharp/issues/1844
本文提供了许多处理此类情况的选项, https://codereview.stackexchange.com/questions/62261/one-shot-events-in-c
答案 2 :(得分:0)
对于那些感兴趣的人,我使用以下变通办法。 我会跟踪已发出的请求数,并且仅在有新请求时才执行操作。 就我而言,这似乎很好。但是我可以想象,浏览器实际上仍然可以执行某些操作,有时您需要等待最后一次完成。
using CefSharp;
public class RequestHandler : IRequestHandler
{
//left all the irrelevant IRequestHandler methods out of this example code, but you'll need to implement them
public int NrOfCalls { get; set; }
public bool OnBeforeBrowse(IWebBrowser chromiumWebBrowser, IBrowser browser, IFrame frame, IRequest request, bool userGesture, bool isRedirect)
{
NrOfCalls++;
return false;
}
}
public class Handle
{
private RequestHandler _requestHandler;
private IWebBrowser _browser;
private int previousRequestNrWhereLoadingFinished = -1;
public Handle()
{
_requestHandler = new RequestHandler();
_browser.RequestHandler = _requestHandler;
}
private void _browser_LoadingStateChanged(object sender, LoadingStateChangedEventArgs e)
{
// Check if page has finished loading
if (!e.IsLoading)
{
//sometimes this is called multiple times for one request, we will only do something if it comes from a newer request than the previous action
if (previousRequestNrWhereLoadingFinished < _requestHandler.NrOfCalls)
{
previousRequestNrWhereLoadingFinished = _requestHandler.NrOfCalls;
ThisMethodWillOnlyBeCalledOncePerRequest();
}
}
}
}