问题
I am getting the following exception when trying to get Microsoft Edge automation to work with Selenium:
OpenQA.Selenium.WebDriverException: Unexpected error. Unknown error
I am using the Selenium.WebDriver.MicrosoftDriver NuGet package, version 17.17134.0.
My code is simply the constructor:
var driver = new EdgeDriver();
I have tried various overloads that are suggested:
var driver = new EdgeDriver(new EdgeOptions());
var driver = new EdgeDriver(pathToMicrosoftWebDriverExecutable);
No luck. I made sure that the WebDriver version from Microsoft matched the Edge version on the machine running the tests.
Is there any way I can get a more informative error message here? Note that all Selenium unit tests work as expected with both the Firefox and Chrome WebDrivers, it's only Edge that won't work.
回答1:
I know you mentioned you had the same versions, but I was getting the same error myself and this is how I resolved it so hopefully this helps.
It appears that Microsoft is no longer releasing the Web Driver as a standalone version, which may be the issue. (See here for more details) Currently, Edge seems to be at version 17763, whereas the NuGet package is 17134. So what I had to do was go in and "install it as a standalone by going to Settings > Apps > Apps & features > Manage optional features." There are some alternative directions that are included in the link above.
Once that installed I pointed the driver to the location and it finally worked.
var driver = new EdgeDriver("C:\\Windows\\System32\\", edgeOptions);
回答2:
I'm not sure how or why, but this worked for me, also. I was getting the pesky "Message: OpenQA.Selenium.WebDriverException : Unexpected error. Unknown error".
I followed Brian Murphy's instructions to install Microsoft Edge Driver as a Standalone by managing my optional features. I don't know where windows installed it, and I didn't need to change any of my code in C#, and my test which was previously failing at Driver = new EdgeDriver(edgeService, options);
once again started to pass.
来源：https://stackoverflow.com/questions/53540426/microsoft-edge-webdriver-unexpected-error-unknown-error