Question

我有一个问题，当我在播放视频时控制电影，然后使用bringToFront（）方法切换到家庭控制。视频仍在播放，至少声音仍在播放。

public partial class MoviesControl : UserControl
{
    public MoviesControl()
    {
        InitializeComponent();

        int width = 560;
        int height = 315;
        webBrowser1.Width = width + 2;
        webBrowser1.Height = height + 2;
        var embed = "<html><head>" +
        "<meta http-equiv=\"X-UA-Compatible\" content=\"IE=Edge,chrome=1\"/>" +
        "</head><body scroll=\"no\" style=\"padding:0px;margin:0px;\">" +
        "<iframe style=\"border: 1px solid #0000ff;\" width=\"{1}\" height=\"{2}\" src=\"{0}\"" +
        "frameborder=\"0\" allow =\"autoplay; encrypted-media\" ></iframe>" +
        "</body></html>";
        string url = "https://www.youtube.com/embed/JvSZKB2WNKg?rel=0&amp;showinfo=0";
        webBrowser1.DocumentText = string.Format(embed, url, width, height);
    }
}

Answer 1

YouTube Player API Reference for iframe Embeds允许您使用javascript代码控制播放器。为了能够使用该脚本API，您应该通过向查询字符串添加iframe来加载enablejsapi=1。

然后暂停视频，您正在寻找pauseVideo命令。使用以下脚本，您可以暂停视频：

var i = document.getElementsByTagName("iframe")[0].contentWindow;
i.postMessage('{"event":"command","func":"pauseVideo","args":""}}', '*');

为了能够从Windows窗体中调用它，将它放在html代码中的函数中，然后使用broswer控件的WebBrowserDocument.InvokeScript()方法调用它。

示例

int w = 560; int h = 315; this.webBrowser1.Width = w + 2; this.webBrowser1.Height = h + 2; var embed = "<html><head>" + "<meta http-equiv=\"X-UA-Compatible\" content=\"IE=Edge,chrome=1\"/>" + "<script>"+ "function stop() {{"+ "var i = document.getElementsByTagName(\"iframe\")[0].contentWindow;" + "i.postMessage('{{\"event\":\"command\",\"func\":\"pauseVideo\",\"args\":\"\"}}', '*');" + "}}</script>"+ "</head><body scroll=\"no\" style=\"padding:0px;margin:0px;\">" + "<iframe style=\"border: 1px solid #fff;\" width=\"{1}\" height=\"{2}\" src=\"{0}\"" + "allow =\"autoplay; encrypted-media\" ></iframe>" + "</body></html>"; var url = "https://www.youtube.com/embed/JvSZKB2WNKg?enablejsapi=1&rel=0&showinfo=0"; webBrowser1.DocumentText = string.Format(embed, url, w, h);

然后您可以随时暂停视频：

webBrowser1.Document.InvokeScript("stop", null);

C＃在切换UserControls时暂停视频或停止Web浏览器

1 个答案: