在Selenium的FirefoxOptions中设置BrowserExecutableLocation不会阻止“无法找到一组匹配的功能”错误 [英] Setting BrowserExecutableLocation in FirefoxOptions in Selenium doesn't prevent an "Unable to find a matching set of capabilities" error

问题描述

对于Selenium来说，我还是一个相当新的东西，并且正在尝试创建一些最低限度通过的测试用例（从某种意义上说，我想你可以称它们为hello world程序的对等）。

我尝试创建Firefox驱动程序的实例，如下所示：

  var options = new FirefoxOptions ）
 {
 BrowserExecutableLocation = @C：\ Program Files（x86）\ Mozilla Firefox \Firefox.exe，
 Profile = new FirefoxProfile（），
 LogLevel = FirefoxDriverLogLevel.Debug 
}; 
 
 firefoxDriver =新的FirefoxDriver（选项）; 
  

但是，当我运行测试时，出现以下错误： Unable找到一组匹配的功能。我在堆栈溢出和其他地方读到的其他答案表明，解决这个问题的方法是显式指定二进制文件的位置，如下所示：

 < （新的FirefoxBinary（@C：\程序文件（x86）\Mozilla Firefox \ firefox.exe），新的FirefoxProfile（））; code> firefoxDriver = new FirefoxDriver 
  

当我尝试这种方法时，它可以工作，但是我得到了下面的编译器警告：

警告CS0618'FirefoxDriver.FirefoxDriver（FirefoxBinary，FirefoxProfile）'已经过时：'FirefoxDriver不能用FirefoxBinary对象构建。改用FirefoxOptions。这个构造函数将会在将来的版本中被移除。

如果第二个版本能够运行，为什么第一个版本不能运行，因为我在 FirefoxOptions 中清楚地指定了 BrowserExecutableLocation ？有没有一种方法可以使我像第一种方式尝试工作，以避免使用第二个，不赞成使用的构造函数？
$ b FWIW，我使用Firefox 52.2.0 ，我的NuGet包设置如下：

 < packages> 
< package id =Selenium.Firefox.WebDriverversion =0.18.0targetFramework =net452/> 
< package id =Selenium.WebDriverversion =3.4.0targetFramework =net452/> 
< package id =Selenium.WebDriver.IEDriverversion =3.4.0targetFramework =net452/> 
< / packages> 
  

解决方案

如果您尝试使用FirefoxOptions，这个构造函数：

pre code> FirefoxDriver（FirefoxDriverService服务，FirefoxOptions选项，TimeSpan commandTimeout）;

对我而言，以下方法无效：

  FirefoxDriverService服务= FirefoxDriverService.CreateDefaultService（Path to Gecko）; 
 service.FirefoxBinaryPath = @C：\ Program Files \Mozilla Firefox\firefox.exe; 
 driver = new FirefoxDriver（service）; 
  

然而，以下效果很好：

  FirefoxDriverService服务= FirefoxDriverService.CreateDefaultService（Gecko Path）; 
 FirefoxOptions选项=新的FirefoxOptions（）; 
 options.BrowserExecutableLocation = @C：\ Program Files \Mozilla Firefox\firefox.exe; 
 driver = new FirefoxDriver（service，options，TimeSpan.FromMinutes（1））; 
  

I'm still fairly new to Selenium and am trying to create some minimally passing test cases (I guess you could call them the equivalent of a "hello world" program in a sense).

I tried to create an instance of the Firefox Driver like this:

var options = new FirefoxOptions()
{
    BrowserExecutableLocation = @"C:\Program Files(x86)\Mozilla Firefox\Firefox.exe",
    Profile = new FirefoxProfile(),
    LogLevel = FirefoxDriverLogLevel.Debug
};

firefoxDriver = new FirefoxDriver(options);

However, when I ran the test, I got the following error: Unable to find a matching set of capabilities. Several other answers I read on Stack Overflow and elsewhere suggested that the way to fix this is to explicitly specify the location of the binary file, like this:

firefoxDriver = new FirefoxDriver(new FirefoxBinary(@"C:\Program Files (x86)\Mozilla Firefox\firefox.exe"), new FirefoxProfile());

When I try that, it works, but I get the following compiler warning:

Warning CS0618 'FirefoxDriver.FirefoxDriver(FirefoxBinary, FirefoxProfile)' is obsolete: 'FirefoxDriver should not be constructed with a FirefoxBinary object. Use FirefoxOptions instead. This constructor will be removed in a future release.'

If the second version works, why doesn't the first version work as well, given that I clearly specified the BrowserExecutableLocation in FirefoxOptions? Is there a way to make something like the first way I tried work in order to avoid using the second, deprecated constructor?

FWIW, I'm using Firefox 52.2.0, and my NuGet packages are set as follows:

<packages>
  <package id="Selenium.Firefox.WebDriver" version="0.18.0" targetFramework="net452" />
  <package id="Selenium.WebDriver" version="3.4.0" targetFramework="net452" />
  <package id="Selenium.WebDriver.IEDriver" version="3.4.0" targetFramework="net452" />
</packages>

解决方案

If you are trying to use FirefoxOptions in particular, try this constructor:

FirefoxDriver(FirefoxDriverService service, FirefoxOptions options, TimeSpan commandTimeout);

For me the following did not work:

FirefoxDriverService service = FirefoxDriverService.CreateDefaultService(Path to Gecko);
service.FirefoxBinaryPath = @"C:\Program Files\Mozilla Firefox\firefox.exe";
driver = new FirefoxDriver(service);

However the following works well:

FirefoxDriverService service = FirefoxDriverService.CreateDefaultService("Gecko Path");
FirefoxOptions options = new FirefoxOptions();
options.BrowserExecutableLocation = @"C:\Program Files\Mozilla Firefox\firefox.exe";
driver = new FirefoxDriver(service, options, TimeSpan.FromMinutes(1));

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