2

我有 html 字符串/文档（如果您在 IE 浏览器中查看任何网页的源代码，则生成的 html 代码）存储在数据库中，我需要使用 C#/.Net wcf 服务将此 html 转换为图像。当前代码正在使用 WebBrowser，它工作正常，只是它非常慢并且偶尔会遇到问题。

我想在不使用 WebBrowser 的情况下替换此功能（将 html 转换为 .png 图像）。我尝试使用似乎可以解决大多数问题的 TheArtofdev.HtmlRenderer，但是当它遇到 html（包含多个“div>”可能是？）时似乎遇到了问题，如下面的 html 并且它不能正确生成图像。它仅生成此 html 的部分图像。

    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1 plus MathML 2.0//EN" "http://www.w3.org/Math/DTD/mathml2/xhtml-math11-f.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><style>p { padding: 0px; border: 0px ; margin: 0px;}ul { padding: 0px; border: 0px; margin: 0px;}</style><title>Item 18626</title></head><body><table border="0" width="700"><tr><td><strong><font face="verdana,geneva">Item 18626</font></strong><br></br></td></tr><tr><td><font face="verdana,geneva"><p style="font-weight:normal; font-weight:normal; ">Use the following passages to answer the question. </p><p style="font-weight:normal; ">&#xA0;</p><div align="center"><p><b>Mariana's Thesis Statement</b></p></div><div align="center"><table><colgroup style="width:46.6206em; " /><tbody><tr><td style="padding:0.2292em;  border:0.0834em solid #000000; "><p style="">The Cold War policy of containment was a success.</p></td></tr></tbody></table></div><p>&#xA0;</p><div align="center"><p><b>Information on the Vietnam War</b></p></div><div align="center"><table><colgroup style="width:46.6206em; " /><tbody><tr><td style="padding:0.2292em;  border:0.0834em solid #000000; "><p style="">The United States sent advisors to South Vietnam in 1954 to help the government fight communist guerrillas who wanted to reunite with communist North Vietnam. By 1964, the United States began sending combat troops. The U.S. military used extensive bombing and advanced technology; however, they were unable to turn the tide against communism. In 1973, the United States withdrew from South Vietnam, and in 1975, the government of South Vietnam fell to the communists and the country was reunited.</p></td></tr></tbody></table></div><p>&#xA0;</p><p>Mariana is writing a paper about the Cold War and discovers the information above on the Vietnam War. </p><p style="font-weight:normal; ">&#xA0;</p><p style="font-weight:normal; ">Describe one way the passage above refutes Mariana's thesis.</p><p style="font-weight:normal; ">&#xA0;</p><p style="font-weight:normal; ">Type your answer in the space provided.</p></font></td></tr><tr><td>&nbsp;</td></tr><tr><td><div id="001" style="border:solid black 1px;width:700px;overflow-x:hidden;overflow-y:visible;text-align:left;word-wrap:break-word"><p>it refutes because it dosent talk about the cold war it only talks about the vietnam war and it just says that the codntainment war was a success thats all it says about the containment war it &nbsp;really just talks about the vietnam war</p>
    </div></td></tr></table><br></br></body></html>

我可以调整上面的 html 以使 HtmlRender 以某种方式快乐吗？如果 HtmlRender 不能按预期工作，还有哪些其他选项（.Net/C#）？非常感谢任何帮助！

4

2 回答 2

1

You could do this using a headless browser such as PhantomJS, which has a NuGet package you could install in your project. With PhantomJS you can create a screenshot of a rendered page.

The PhantomJS package paired together with the Selenium WebDriver and Selenium WebDriver Support Classes packages allows you to take a screenshot using a slight modification of the method given in an answer to another stackoverflow question, Getting screenshot using PhantomJS in C# (note that you'll need to add the OpenQA.Selenium.PhantomJS, OpenQA.Selenium.Support.Extensions, and System.Drawing.Imaging namespaces):

PhantomJSDriver driver = new PhantomJSDriver();
driver.Manage().Window.Maximize(); // optional
driver.Navigate().GoToUrl("file:///C://fullpath//file.html");

driver.TakeScreenshot().SaveAsFile("screenshot.png", ImageFormat.Png);

driver.Quit();
于 2015-12-15T21:10:05.230 回答
0

你可以试试Awesomium。

它就像一个基于 chromium 浏览器的开源 webbrowser 控件。

于 2015-12-16T15:05:49.843 回答