C # webbrowser Development Guide

C # webbrowser Development Guide

Reference Unit mshtml;

Path: C: \ windows \ assembly \ GAC \ Microsoft. mshtml \ 7.0.3300.0 _ b03f5f7f11d50a3a \ Microsoft. mshtml. dll // different version paths

1. How to Use Webbrowser to obtain the full source code of a webpage

1. framework not included

String s = WB1.DocumentText;

2. Framework included

IHTMLDocument2 doc = WB1.Document. DomDocument as IHTMLDocument2;
IHTMLFramesCollection2 frames = doc. frames as IHTMLFramesCollection2;
Int I _frame = 0; // 1st Frames
IHTMLWindow2 frame = frames. item (ref I _frame) as IHTMLWindow2;
IHTMLDocument2 doc2‑frame.doc ument as IHTMLDocument2;
IHTMLDocument3 doc3‑frame.doc ument as IHTMLDocument3;

Strings = doc2.body. innerHTML;

2. How does webbrowser obtain webpage elements?

1. Based on the element ID

HtmlElement ele = WB1.Document. GetElementById ("ID ");

2. Based on the element Name

HtmlElement ele = WB1.Document. All ["Name"];

3. No ID or Name Element

3.1 webbrowser:

HtmlDocument doc = WB1.Document;

HtmlElementCollection elements = doc. All;

Foreach (HtmlElement element in elements)

{

If (element. GetAttribute ("innerText") = "submit answer") // The innnerText attribute of the element is "submit answer"

{

Element. InvokeMember ("Click"); // simulate a Click

Break;

}

}

3.2 webbrowser traverses the element Tag (input, a, img, span, li, div, etc)

Input: All types that can be entered, such as text box, check box, check box, drop-down list, and image.

A: A tag, which can contain hyperlinks

Img: Image Type

Span: SPAN type

Li: drop-down list, list box, etc.

Div: DIV

HtmlElementCollection eles = WB1.Document. GetElementsByTagName ("a") as HtmlElementCollection;
Foreach (HtmlElement ele in eles)
{
If (ele. GetAttribute ("href ")! = Null)
If (ele. GetAttribute ("href") = "A tag HYPERLINK ")
{
Element. InvokeMember ("Click"); // simulate a Click
Break;
}
}

3.3 Based on the index number of the element

HtmlElement ele = WB1.Document. All [0]; // 1st Elements

HtmlElement ele = WB1.Document. GetElementsByTagName ("input") [0]; // The first inuput type element

3.4 obtain unknown elements based on known elements