我在 WinForms 中有一个 WebBrowser 控件,其 URL 属性设置为外部网页。我还有一个用于 DocumentCompleted 事件的事件处理程序。在这个处理程序中,我试图获取特定元素,但 wb.Document.Body 似乎在执行 onload 之前捕获 HTML。
{System.Windows.Forms.HtmlElement}
All: {System.Windows.Forms.HtmlElementCollection}
CanHaveChildren: true
Children: {System.Windows.Forms.HtmlElementCollection}
ClientRectangle: {X = 0 Y = 0 Width = 1200 Height = 0}
Document: {System.Windows.Forms.HtmlDocument}
DomElement: {mshtml.HTMLBodyClass}
ElementShim: {System.Windows.Forms.HtmlElement.HtmlElementShim}
Enabled: true
FirstChild: null
htmlElement: {mshtml.HTMLBodyClass}
Id: null
InnerHtml: "\n"
InnerText: null
Name: ""
NativeHtmlElement: {mshtml.HTMLBodyClass}
NextSibling: null
OffsetParent: null
OffsetRectangle: {X = 0 Y = 0 Width = 1200 Height = 0}
OuterHtml: "<body onload=\"evt_Login_onload(event);\" uitheme=\"Web\">\n</body>"
OuterText: null
Parent: {System.Windows.Forms.HtmlElement}
ScrollLeft: 0
ScrollRectangle: {X = 0 Y = 0 Width = 1200 Height = 0}
ScrollTop: 0
shimManager: {System.Windows.Forms.HtmlShimManager}
ShimManager: {System.Windows.Forms.HtmlShimManager}
Style: null
TabIndex: 0
TagName: "BODY"
"<body onload=\"evt_Login_onload(event);\" uitheme=\"Web\">\n</body>"
是 JavaScript 之前的内容。有没有办法捕获 body 标签之后的状态evt_Login_onload(event);
执行?
我也尝试过使用wb.Document.GetElementById("id")
,但它返回 null。
这是如何完成的,我已经内嵌了一些评论:
private void Form1_Load(object sender, EventArgs e)
{
bool complete = false;
this.webBrowser1.DocumentCompleted += delegate
{
if (complete)
return;
complete = true;
// DocumentCompleted is fired before window.onload and body.onload
this.webBrowser1.Document.Window.AttachEventHandler("onload", delegate
{
// Defer this to make sure all possible onload event handlers got fired
System.Threading.SynchronizationContext.Current.Post(delegate
{
// try webBrowser1.Document.GetElementById("id") here
MessageBox.Show("window.onload was fired, can access DOM!");
}, null);
});
};
this.webBrowser1.Navigate("http://www.example.com");
}
Updated,现在是 2019 年了,这个答案令人惊讶地仍然受到关注,所以我想指出,我推荐的使用现代 C# 的方法是使用async/await
, like this https://stackoverflow.com/a/20934538/1768303.
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