我正在使用WebBrowser控件来测试表单提交，在这种特殊情况下，该操作是一个重定向到另一个结果页面的MVC操作。
代码非常简单......
void _browser_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
var parentForm = _my_find_form_function();
parentForm.SetAttribute("action", "http://localhost/tests/TestSubmission");
parentForm.InvokeMember("submit");
}
提交后（按预期工作）我会认为在加载重定向页面后会触发下一个documentcompleted事件。相反，加载了相同的页面（带有表单）。
有什么东西我不见了吗？
由于
答案 0 :(得分：1)
好的，对不起延迟，我转向别的......
无论如何，它真的很粗糙，但你应该能够挑选你需要的东西。
raiseynamicevent方法的工作方式与async nav类似，方法是监视事件后的文档状态。当再次确定时，返回。应该处理ajax的东西。我需要重新考虑一下并避免使用它，但希望可以帮助某人。
/// the _profileQueue was a queue of URLs i wanted to nav through and find an
/// form elem and "click" the submit button on
private async void Next()
{
Submission res = null;
if (_profileQueue.TryDequeue(out res))
{
// dirty, but hold the details of the url i'm navigating to in the Tag
_browser.Tag = res;
var cts = new CancellationTokenSource(Properties.Settings.Default.BrowserNavigationTimeout); // cancel in 10s
var html = await LoadDynamicPage(res.SiteProfile.URL, cts.Token);
// this parses the dom once loaded (awaits for the page)
ProcessSiteProfile();
Next();
}
}
// navigate and download
async Task<string> LoadDynamicPage(string url, CancellationToken token)
{
// navigate and await DocumentCompleted
var tcs = new TaskCompletionSource<bool>();
WebBrowserDocumentCompletedEventHandler handler = (s, arg) =>
tcs.TrySetResult(true);
// i'm keeping the tcs in a concurrentdictionary against the browser object
// again, this is pretty dirty but obviously felt like i needed it.
_browserTasks[_browser] = tcs;
using (token.Register(() => tcs.TrySetCanceled(), useSynchronizationContext: true))
{
// nav to page async
this._browser.DocumentCompleted += handler;
try
{
if (!string.IsNullOrWhiteSpace(url))
{
this._browser.Navigate(url);
await tcs.Task; // wait for DocumentCompleted
}
}
finally
{
this._browser.DocumentCompleted -= handler;
}
}
// get the root element
var documentElement = this._browser.Document.GetElementsByTagName("html")[0];
// poll the current HTML for changes asynchronosly
var html = documentElement.OuterHtml;
while (true)
{
// wait asynchronously, this will throw if cancellation requested
await Task.Delay(Properties.Settings.Default.BrowserNavigationWait, token);
// continue polling if the WebBrowser is still busy
if (this._browser.IsBusy)
continue;
var htmlNow = documentElement.OuterHtml;
if (html == htmlNow)
break; // no changes detected, end the poll loop
html = htmlNow;
}
// consider the page fully rendered
token.ThrowIfCancellationRequested();
// remove from task dictionary
_browserTasks[this._browser] = null;
return html;
}
async void ProcessSiteProfile()
{
// now process submission
HtmlElement parentForm = null;
/////////////////
// parse dom to find the form you're looking for
// couple of helpers below
///////////////////////
parentForm = HtmlElementQuery(_browser.Document, "myTextFieldInput");
var sub = (_browser.Tag as Submission);
HtmlDocument doc = _browser.Document;
if (parentForm != null)
{
var elements = parentForm.GetElementsByTagName("input");
foreach (HtmlElement el in elements)
{
// If there's more than one button, you can check the
// element.InnerHTML to see if it's the one you want
if (el.GetAttribute("type").ToLower() == "submit")
{
var cts = new CancellationTokenSource(Properties.Settings.Default.BrowserNavigationTimeout); // cancel in 10s
var html = await RaiseDynamicEvent(el, "click", cts.Token);
}
}
}
}
// used to raise an event with a dom element that would cause the document to change
async Task<string> RaiseDynamicEvent(HtmlElement element, string evt, CancellationToken token)
{
// navigate and await DocumentCompleted
var tcs = new TaskCompletionSource<bool>();
WebBrowserDocumentCompletedEventHandler handler = (s, arg) =>
tcs.TrySetResult(true);
_browserTasks[_browser] = tcs;
using (token.Register(() => tcs.TrySetCanceled(), useSynchronizationContext: true))
{
this._browser.DocumentCompleted += handler;
try
{
element.InvokeMember(evt);
try
{
await tcs.Task; // wait for DocumentCompleted
}
catch (TaskCanceledException)
{
// no the end of the world
}
}
finally
{
this._browser.DocumentCompleted -= handler;
}
}
// get the root element
var documentElement = this._browser.Document.GetElementsByTagName("html")[0];
// poll the current HTML for changes asynchronosly
var html = documentElement.OuterHtml;
while (true)
{
// wait asynchronously, this will throw if cancellation requested
await Task.Delay(500, token);
// continue polling if the WebBrowser is still busy
if (this._browser.IsBusy)
continue;
var htmlNow = documentElement.OuterHtml;
if (html == htmlNow)
break; // no changes detected, end the poll loop
html = htmlNow;
}
// consider the page fully rendered
token.ThrowIfCancellationRequested();
// remove from task dictionary
_browserTasks[this._browser] = null;
return html;
}
// couple of useful helpers
HtmlElement FindParentByElement(string elementName, HtmlElement element)
{
if (element.Parent != null)
{
if (element.Parent.TagName.ToLower() == elementName.ToLower())
{
return element.Parent;
}
else
{
return FindParentByElement(elementName, element.Parent);
}
}
else
{
return null;
}
}
HtmlElement HtmlElementQuery(HtmlDocument container, string query)
{
HtmlElement el = null;
if (query.StartsWith("#"))
{
el = container.GetElementById(query.TrimStart('#'));
}
else
{
el = container.All[query];
}
return el;
}