CefSharp Winfoms页面加载并等待 [英] CefSharp winfoms Page load and wait
问题描述
我正在研究应用程序中的 Cefsharp Offscreen 。加载页面的文档中提供的代码为:
I'm working on Cefsharp Offscreen in my application. The code provided in documentation to load page is:
const string testUrl = "https://github.com/cefsharp/CefSharp/wiki/Quick-Start";
var settings = new CefSettings()
{
//By default CefSharp will use an in-memory cache, you need to specify a Cache Folder to persist data
CachePath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), "CefSharp\\Cache")
};
//Perform dependency check to make sure all relevant resources are in our output directory.
Cef.Initialize(settings, performDependencyCheck: true, browserProcessHandler: null);
// Create the offscreen Chromium browser.
browser = new ChromiumWebBrowser(testUrl);
// An event that is fired when the first page is finished loading.
// This returns to us from another thread.
browser.LoadingStateChanged += BrowserLoadingStateChanged;
Cef.Shutdown();
但是我想要这样的东西
browser = new ChromiumWebBrowser(); //without testUrl
// and then
browser.Load(testUrl).Wait();// and wait something like that;
// load url and wait unit page is fully loaded then go to next line
I找不到任何解决方案。
I couldn't find any solution.
推荐答案
CefSharp.OffScreen.Example.Program.cs 类包含使用< a href = https://docs.microsoft.com/zh-cn/dotnet/api/system.threading.tasks.taskcompletionsource-1?view=netframework-4.8 rel = nofollow noreferrer> TaskCompletionSource 包装 LoadingStateChanged
事件,以便可以 await
页面加载
。
The CefSharp.OffScreen.Example.Program.cs class in the project source contains an example of using a TaskCompletionSource to wrap the LoadingStateChanged
event so you can await
the Page Load
.
实现为扩展方法的基本示例如下:
A basic example implemented as an extension method would look like:
public static class WebBrowserExtensions
{
public static Task LoadPageAsync(this IWebBrowser browser, string address = null)
{
var tcs = new TaskCompletionSource<bool>(TaskCreationOptions.RunContinuationsAsynchronously);
EventHandler<LoadingStateChangedEventArgs> handler = null;
handler = (sender, args) =>
{
//Wait for while page to finish loading not just the first frame
if (!args.IsLoading)
{
browser.LoadingStateChanged -= handler;
//Important that the continuation runs async using TaskCreationOptions.RunContinuationsAsynchronously
tcs.TrySetResult(true);
}
};
browser.LoadingStateChanged += handler;
if (!string.IsNullOrEmpty(address))
{
browser.Load(address);
}
return tcs.Task;
}
}
然后您可以编写类似
browser = new ChromiumWebBrowser();
await browser.LoadPageAsync(testUrl);
将浏览器编写为 async
不建议也不支持使用 Task.Wait
进行阻止。使用 async / await
。
The browser is written to be async
and blocking using Task.Wait
is not recommended nor supported. Use async/await
.
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