How to Inject JavaScript into a WebBrowser Control Without Using InnerHtml?

Injecting JavaScript into a WebBrowser Control

Question:

I am trying to inject a JavaScript script into a WebBrowser control, but encountering errors when setting the InnerHtml property of the script element. Is there an alternative method to achieve this?

Answer:

虽然原始尝试未能成功，但可以使用以下方法将脚本注入 DOM：

HtmlElement head = webBrowser1.Document.GetElementsByTagName("head")[0];
HtmlElement scriptEl = webBrowser1.Document.CreateElement("script");
IHTMLScriptElement element = (IHTMLScriptElement)scriptEl.DomElement;
element.text = "function sayHello() { alert('hello') }";
head.AppendChild(scriptEl);
webBrowser1.Document.InvokeScript("sayHello");

Explanation:

• Get IHTMLScriptElement Interface:

  • The DomElement property exposes the underlying COM object. Casting this to IHTMLScriptElement allows access to the text property.

• Set Script Text:

  • Assign the desired JavaScript code to the text property.

• Invoke Script:

  • Call InvokeScript on the document to execute the injected script.

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