selenium c# 的註意事項
http://chromedriver.storage.googleapis.com/index.html chromedriver的下載地址
http://selenium-release.storage.googleapis.com/index.html IEdriver的下載地址
https://github.com/mozilla/geckodriver/releases firefoxdriver的下載地址
問題積累：
1. 關於IE11不能定位的問題：解決方案：
For IE 11 only, you will need to set a registry entry on the target computer so that the driver can maintain a connection to the instance of Internet Explorer it creates. （這段告訴你需要修改註冊表。）
For 32-bit Windows installations, the key you must examine in the registry editor is HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_BFCACHE. （32bit Windows看這裏。）
For 64-bit Windows installations, the key is HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_BFCACHE. Please note that the FEATURE_BFCACHE subkey may or may not be present, and should be created if it is not present. Important: Inside this key, create a DWORD value named iexplore.exe with the value of 0.（64bit Windows看這裏。）
翻譯過來的意思即，修改你的註冊表（Run->regedit->Enter），路徑如下：
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_BFCACHE
如果FeatureControl下沒有FEATURE_BFCACHE，就以FEATURE_BFCACHE為名new一個key！並在其下創建一個DWORD，取名為：iexplore.exe，value為0。
2. IE的click無效的解決方案：
使用模擬js點擊：
((IJavaScriptExecutor)driver).ExecuteScript("arguments[0].click();", driver.FindElement(By.TagName("button")));
3. IE的sendkeys慢的解決方案：
IE的64位driver有bug，使用32位的driver
4. firefox中sendkeys報錯的問題
firefox的版本問題，使用52版本的firefox可以解決
selenium c# 的註意事項