Question

我正在尝试使用Web Timing API和Selenium 2 webdrivers以及C＃

来捕获我的网页加载的各种事件所需的时间（以捕获性能）

基本上这个想法（最初来自Mozilla团队的开发者）来自Dean Hume的博客文章...... http://deanhume.com/Home/BlogPost/measuring-web-page-performance-with-selenium-2-and-the-web-timings-api/56

我无耻地复制了扩展类，并编写了几种方法来获取我想要的格式的数字..

public static class Extensions
{
    public static Dictionary<string, object> WebTimings(this IWebDriver driver)
    {
        const string scriptToExecute =
            "var performance = window.performance || window.mozPerformance || window.msPerformance || window.webkitPerformance || {}; var timings = performance.timing || {}; return timings;";

        var webTiming = (Dictionary<string, object>)((IJavaScriptExecutor)driver)
            .ExecuteScript(scriptToExecute);

        return webTiming;
    }
}

我的方法会给我时间差异......

        //InternetExplorerOptions options = new InternetExplorerOptions();
        //options.IntroduceInstabilityByIgnoringProtectedModeSettings = true;
        //options.UseInternalServer = true;
        //IWebDriver _driver = new InternetExplorerDriver(options);

        IWebDriver _driver = new FirefoxDriver();

        //IWebDriver _driver = new ChromeDriver();

        Program p = new Program();

        _driver.Manage().Timeouts().ImplicitlyWait(new TimeSpan(0, 0, 30));
        _driver.Navigate().GoToUrl("http://www.google.com");

        Dictionary<string, object> webTimings = _driver.WebTimings();
        Dictionary<string, Int64> timeinSec = new Dictionary<string, Int64>();

        timeinSec.Add("ConnectTime", p.GetTimeDiff(webTimings["connectEnd"], webTimings["connectStart"]));

当我使用InternetExplorerDriver（选项）时，我遇到了这个异常。但是相同的代码适用于Firefox和Chrome驱动程序。

IE总是一个痛苦的屁股，它继续被证明是如此**我不明白我怎样才能投出.ExecuteScript(scriptToExecute);返回的内容......？

感谢此处的任何输入..

Unhandled Exception: System.InvalidCastException: Unable to cast object of type
'OpenQA.Selenium.Remote.RemoteWebElement' to type 'System.Collections.Generic.Di
ctionary`2[System.String,System.Object]'.
   at Selenium.Examples.Performance.Extensions.WebTimings(IWebDriver driver) in
C:\Users\......\Extensions.cs:line 13
   at PerfCaptureSample.Program.Main(String[] args) in C:\.........\Program.cs:line 52

Answer 1

虽然年龄很大，但我遇到了同样的问题。我发现你可以使用toJSON转换对象并且它正确返回。工作代码如下：

return timings.toJSON();

最终代码是：

public static class Extensions
{
    public static Dictionary<string, object> WebTimings(this IWebDriver driver)
    {
        const string scriptToExecute =
            "var performance = window.performance || window.mozPerformance || window.msPerformance || window.webkitPerformance || {}; var timings = performance.timing || {}; return timings.toJSON();";

        var webTiming = (Dictionary<string, object>)((IJavaScriptExecutor)driver)
        .ExecuteScript(scriptToExecute);

        return webTiming;
    }
}

无法将“OpenQA.Selenium.Remote.RemoteWebElement”类型的对象强制转换为“System.Collections.Generic.Di ctionary”2 [System.String，System.Object]

1 个答案: