无法从超时获取自动化扩展:从渲染器接收消息超时 [英] Cannot get automation extension from timeout: Timed out receiving message from renderer

问题描述

使用 Selenium Webdriver (C#) 我不时收到下一个错误:

Using Selenium Webdriver (C#) I'm getting the next error from time to time:

System.InvalidOperationException:未知错误:无法从超时获得自动化扩展:从渲染器接收消息超时:-3.959(会话信息:chrome=37.0.2062.120)(驱动程序信息:chromedriver=2.10.267521，平台=Windows NT6.2 x86_64)

System.InvalidOperationException : unknown error: cannot get automation extension from timeout: Timed out receiving message from renderer: -3.959 (Session info: chrome=37.0.2062.120) (Driver info: chromedriver=2.10.267521,platform=Windows NT 6.2 x86_64)

这个错误出现的方式:

OpenQA.Selenium.Remote.RemoteWebDriver.UnpackAndThrowOnError(Response errorResponse) in c:ProjectswebdriverdotnetsrcwebdriverRemoteRemoteWebDriver.cs:OpenQA.Selenium.Remote.RemoteWebDriver.Execute 的第 1048 行(字符串driverCommandToExecute，Dictionary`2 参数)在 c:ProjectswebdriverdotnetsrcwebdriverRemoteRemoteWebDriver.cs:AutomatedTests.DriverCover..ctor(IWebDriver 驱动程序)的第 865 行

OpenQA.Selenium.Remote.RemoteWebDriver.UnpackAndThrowOnError(Response errorResponse) in c:ProjectswebdriverdotnetsrcwebdriverRemoteRemoteWebDriver.cs:line 1048 at OpenQA.Selenium.Remote.RemoteWebDriver.Execute(String driverCommandToExecute, Dictionary`2 parameters) in c:ProjectswebdriverdotnetsrcwebdriverRemoteRemoteWebDriver.cs:line 865 at AutomatedTests.DriverCover..ctor(IWebDriver driver)

所以，它发生在下一段代码中:

So, it's happening in the next piece of code:

 public class DriverCover
 {
        public DriverCover(IWebDriver driver)
        {
            _driver = driver;

            _driver.Manage().Window.Maximize(); //There is my mistake
        }

        private readonly IWebDriver _driver;
 }

我使用这个类作为 PageObject 类的基类，在这里我使用 PageFactory 来初始化网页的元素.

I use this class as a base class of PageObject classes where I use PageFactory to initialize elements of web pages.

我有 chromedriver v.2.10和谷歌浏览器 v. 37.0.2062.120 m

I have chromedriver v.2.10 and Google Chrome v. 37.0.2062.120 m

另外:在同一行我得到另一个错误:

In addition: at the same line I got another error:

OpenQA.Selenium.WebDriverException :对 URL http://localhost:62407/session/021e05cd4c89abedb2abc77342b3bd7c/window/current/maximize 的远程 WebDriver 服务器的 HTTP 请求在 60 秒后超时.----> System.Net.WebException : 操作在 c:ProjectswebdriverdotnetsrcwebdriverRemoteHttpCommandExecutor.cs:line 中的 OpenQA.Selenium.Remote.HttpCommandExecutor.CreateResponse(WebRequest request) 处超时152 在 OpenQA.Selenium.Remote.DriverServiceCommandExecutor.Execute(Command commandToExecute) 在 c:ProjectswebdriverdotnetsrcwebdriverRemoteDriverServiceCommandExecutor.cs: 线 73 在 OpenQA.Selenium.Remote.RemoteWebDriver.Execute(String driverCommandToExecute, Dictionary`2 参数)在 c:ProjectswebdriverdotnetsrcwebdriverRemoteRemoteWebDriver.cs:AutomatedTests.DriverCover..ctor(IWebDriver 驱动程序)的第 852 行

OpenQA.Selenium.WebDriverException : The HTTP request to the remote WebDriver server for URL http://localhost:62407/session/021e05cd4c89abedb2abc77342b3bd7c/window/current/maximize timed out after 60 seconds. ----> System.Net.WebException : The operation has timed outat OpenQA.Selenium.Remote.HttpCommandExecutor.CreateResponse(WebRequest request) in c:ProjectswebdriverdotnetsrcwebdriverRemoteHttpCommandExecutor.cs:line 152 at OpenQA.Selenium.Remote.DriverServiceCommandExecutor.Execute(Command commandToExecute) in c:ProjectswebdriverdotnetsrcwebdriverRemoteDriverServiceCommandExecutor.cs:line 73 at OpenQA.Selenium.Remote.RemoteWebDriver.Execute(String driverCommandToExecute, Dictionary`2 parameters) in c:ProjectswebdriverdotnetsrcwebdriverRemoteRemoteWebDriver.cs:line 852 at AutomatedTests.DriverCover..ctor(IWebDriver driver)

推荐答案

我们在 Chrome 中看到了类似的情况，问题归结为我们在运行测试之前最大化浏览器的方式.

We were seeing something similar with Chrome and the issue came down to the way we were maximizing the browser before running the tests.

我们从这里切换:

Driver.Manage().Window.Maximize();

至此(仅适用于 Chrome):

To this (for Chrome only):

if (typeof(TWebDriver) == typeof(ChromeDriver))
{
    var options = new ChromeOptions();
    options.AddArgument("start-maximized");

    driver = new ChromeDriver(driverPath, options);
}

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