Chrome 117隐身模式下Selenium自动下载PDF弹出保存窗口求助

环境信息 #

• Chrome版本：Version 117.0.5938.89 (官方版本) (64位)
• 自动化测试环境：使用Selenium WebDriver结合C#进行自动化测试

问题描述 #

此前在隐身模式下，点击按钮即可自动下载PDF并执行后续测试操作，但升级至上述Chrome版本后，相同的驱动初始化逻辑在隐身模式下点击按钮下载PDF时，会触发Windows的“另存为”文件弹窗。已尝试设置默认下载目录，但问题仍未解决。

求助需求 #

实现无需弹出“另存为”窗口，直接完成PDF文件下载。

当前驱动初始化代码 #

private static IWebDriver GetChromeDriver(string userAgent)
{
    var options = new ChromeOptions();
    options.AddArgument("incognito");
    options.AddArguments("disable-infobars");
    // options.AddArguments("--headless");

    // Session 0 limit - 1024 x 768
    options.AddArguments("--window-size=1024,768");
    options.AddArguments("--window-position=0,0");
    options.AddArgument($"--user-agent= {userAgent}");

    // To disable PDF viewer plugins
    options.AddUserProfilePreference("plugins.always_open_pdf_externally", true);
    options.AddUserProfilePreference("download.prompt_for_download", false);

    if (userAgent.Contains("Mobile"))
    {
        // Commenting "EnableMobileEmulation" with Device Name - as it overrides the set Driver's userAgent value
        // Added Device Settings to pass userAgent and explicit values of Mobile Device - To avoid captcha block
        var settings = new ChromeMobileEmulationDeviceSettings(userAgent)
        {
            Height = 731,
            Width = 411,
            PixelRatio = 2.6
        };
        options.EnableMobileEmulation(settings);

        // options.EnableMobileEmulation("Pixel 2");
    }
    options.AddArgument("--disable-backgrounding-occluded-windows");

    // options.BinaryLocation = @"C:\Program Files\Google\Chrome\Application\chrome.exe";

    var driver = new ChromeDriver(Directory.GetCurrentDirectory(), options, TimeSpan.FromMinutes(3));
    return driver;
}

解决方案 #

针对Chrome 117+版本隐身模式下的PDF下载弹窗问题，可尝试以下调整：

1. 补充指定默认下载目录
   隐身模式下会隔离本地用户配置，仅禁用下载弹窗的设置可能不生效，需明确指定下载路径：

   string downloadPath = @"C:\Your\Custom\Download\Path";
   options.AddUserProfilePreference("download.default_directory", downloadPath);
   options.AddUserProfilePreference("download.directory_upgrade", true);
   

2. 新增PDF强制下载的配置项
   Chrome新版本对PDF预览逻辑有调整，添加以下配置强制跳过预览直接下载：

   options.AddUserProfilePreference("plugins.plugins_list", new List<object> { new { name = "Chrome PDF Viewer" } });
   options.AddUserProfilePreference("download.extensions_to_open", "");
   options.AddArgument("--disable-features=PDFViewer");
   

3. 调整后的完整初始化代码
   整合所有修复项后的代码示例：

   private static IWebDriver GetChromeDriver(string userAgent)
   {
       var options = new ChromeOptions();
       options.AddArgument("incognito");
       options.AddArguments("disable-infobars");
       // options.AddArguments("--headless");
   
       // Session 0 limit - 1024 x 768
       options.AddArguments("--window-size=1024,768");
       options.AddArguments("--window-position=0,0");
       options.AddArgument($"--user-agent= {userAgent}");
   
       // 下载核心配置
       string downloadPath = @"C:\Your\Custom\Download\Path";
       options.AddUserProfilePreference("download.default_directory", downloadPath);
       options.AddUserProfilePreference("download.prompt_for_download", false);
       options.AddUserProfilePreference("download.directory_upgrade", true);
   
       // PDF强制下载配置
       options.AddUserProfilePreference("plugins.always_open_pdf_externally", true);
       options.AddUserProfilePreference("plugins.plugins_list", new List<object> { new { name = "Chrome PDF Viewer" } });
       options.AddUserProfilePreference("download.extensions_to_open", "");
       options.AddArgument("--disable-features=PDFViewer");
   
       if (userAgent.Contains("Mobile"))
       {
           var settings = new ChromeMobileEmulationDeviceSettings(userAgent)
           {
               Height = 731,
               Width = 411,
               PixelRatio = 2.6
           };
           options.EnableMobileEmulation(settings);
       }
       options.AddArgument("--disable-backgrounding-occluded-windows");
   
       var driver = new ChromeDriver(Directory.GetCurrentDirectory(), options, TimeSpan.FromMinutes(3));
       return driver;
   }
   

4. 验证驱动版本兼容性
   确保ChromeDriver版本与Chrome 117.0.5938.89完全匹配，版本不匹配会导致配置失效。

内容的提问来源于stack exchange，提问作者Chandler