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+1 vote
in DevOps and Agile by (19.7k points)

Here is what I'm using, the user agent can be successfully set, while download preferences cannot.

Windows 7, Chrome 26, Selenium-dotnet-2.31.2, chromedriver_win_26.0.1383.0

ChromeOptions chromeOptions = new ChromeOptions();

var prefs = new Dictionary<string, object> {

    { "download.default_directory", @"C:\code" },

    { "download.prompt_for_download", false }


chromeOptions.AddAdditionalCapability("chrome.prefs", prefs);

chromeOptions.AddArgument("--user-agent=" + "some safari agent");

var driver = new ChromeDriver(chromeOptions);

Taken from chromedriver.log:

[1.201][FINE]:      Initializing session with capabilities {

   "browserName": "chrome",

   "chrome.prefs": {

      "download.default_directory": "C:\\code",

      "download.prompt_for_download": false


   "chrome.switches": [ "--user-agent=Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/534.57.2 (KHTML, like Gecko) Version..." ],

   "chromeOptions": {

      "args": [ "--user-agent=Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/534.57.2 (KHTML, like Gecko) Version..." ],

      "binary": "",

      "extensions": [  ]


   "javascriptEnabled": true,

   "platform": "WINDOWS",

   "version": ""


Check the temp Preferences file at *temp\Google\Chrome\User Data\Default\Preferences, no "default_directory" and "prompt_for_download" are set.

   "download": {

      "directory_upgrade": true


1 Answer

0 votes
by (62.9k points)

It seems that Chrome Version and Selenium version have been updated. You now can use the following code

ChromeOptions options = new ChromeOptions();

options.AddUserProfilePreference(string preferenceName, object preferenceValue); 

I currently use it to change my Printer settings to "Save as PDF" instead of the default using this code as an example

ChromeOptions options = new ChromeOptions();

options.AddUserProfilePreference("printing.print_preview_sticky_settings.appState", "{\"version\":2,\"isGcpPromoDismissed\":false,\"selectedDestinationId\":\"Save as PDF\"); 

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