c# - 在WebBrowser控件C#中执行包含方法的javascript

Question

我真的需要一些帮助来在 WebBrowser 控件中执行这段 javascript 代码。在网站上，它是这样执行的：

"javascript:setTimeout('__doPostBack(\'dsl50$ct160$g_818f5662_1255_51ab_d4e1_6bse0453e306$ba400$rdProcess$ucTopQuestions$qst_1995\',\'\')', 0)"

我尝试了很多事情，比如：

webBrowser1.Navigate("javascript:setTimeout('__doPostBack(\'dsl50$ct160$g_818f5662_1255_51ab_d4e1_6bse0453e306$ba400$rdProcess$ucTopQuestions$qst_1995\',\'\')', 0)");

但它不起作用。

有人有什么建议吗？

编辑：

也试过这个：

HtmlElement head = webBrowser1.Document.GetElementsByTagName("head")[0];
            HtmlElement scriptEl = webBrowser1.Document.CreateElement("script");
            IHTMLScriptElement element = (IHTMLScriptElement)scriptEl.DomElement;
            element.text = "function __doPostBack(eventTarget, eventArgument)";
            head.AppendChild(scriptEl);
            webBrowser1.Document.InvokeScript("__doPostBack(\'dsl50$ct160$g_818f5662_1255_51ab_d4e1_6bse0453e306$ba400$rdProcess$ucTopQuestions$qst_1995\',\'\'");

我得到 JS 异常：

编辑2：

我也做了：

string sa = @"function __doPostBack(eventTarget, eventArgument) {
    if (!theForm.onsubmit || (theForm.onsubmit() != false)) {
        theForm.__EVENTTARGET.value = eventTarget;
        theForm.__EVENTARGUMENT.value = eventArgument;
        theForm.submit();
    }
}";

element.text = s;

但是什么也没发生，JS 没有被执行。

编辑3：

也试过

webBrowser1.Document.InvokeScript(@"__doPostBack(\'dsl50$ct160$g_818f5662_1255_51ab_d4e1_6bse0453e306$ba400$rdProcess$ucTopQuestions$qst_1995\',\'\'");

但什么也没有发生。浏览器应该刷新。这是来自浏览器的代码：

<select name="dsl50$ct160$g_818f5662_1255_51ab_d4e1_6bse0453e306$ba400$rdProcess$ucTopQuestions$qst_1995" onchange="javascript:setTimeout('__doPostBack(\'dsl50$ct160$g_818f5662_1255_51ab_d4e1_6bse0453e306$ba400$rdProcess$ucTopQuestions$qst_1995\',\'\')', 0)" id="dsl50$ct160$g_818f5662_1255_51ab_d4e1_6bse0453e306$ba400$rdProcess$ucTopQuestions$qst_1995" class="dropdown" pid="as2ba2d5-d2cc-dad2-9e35-abd345678aac">
                <option value="1 (1)">1</option>
                <option value="2 (2)">2</option>
                <option value="3 (3)">3</option>

            </select>

Answer 1

检查此链接：

如何在 WebBrowser 控件中注入 Javascript？

代码：

    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");

Answer 2

我想你想要：

string javascriptDoPostBack = @"function __doPostBack(eventTarget, eventArgument) {
    if (!theForm.onsubmit || (theForm.onsubmit() != false)) {
        theForm.__EVENTTARGET.value = eventTarget;
        theForm.__EVENTARGUMENT.value = eventArgument;
        theForm.submit();
    }
}";

HtmlElement head = webBrowser1.Document.GetElementsByTagName("head")[0];
HtmlElement scriptEl = webBrowser1.Document.CreateElement("script");
IHTMLScriptElement element = (IHTMLScriptElement)scriptEl.DomElement;
element.text = javascriptDoPostBack;
head.AppendChild(scriptEl);

webBrowser1.Document.InvokeScript("__doPostBack('dsl50$ct160$g_818f5662_1255_51ab_d4e1_6bse0453e306$ba400$rdProcess$ucTopQuestions$qst_1995','');");