[dotnet] only use driver directory when full file path provided

Author: titusfortner

dotnet/src/webdriver/Chrome/ChromeDriverService.cs

@@ -67,7 +67,7 @@ public static ChromeDriverService CreateDefaultService(ChromeOptions options)
         /// <returns>A ChromeDriverService using a random port.</returns>
         public static ChromeDriverService CreateDefaultService(string driverPath)
         {
-            if (Path.GetFileName(driverPath).Contains(DefaultChromeDriverServiceExecutableName))
+            if (File.Exists(driverPath))
             {
                 driverPath = Path.GetDirectoryName(driverPath);
             }

dotnet/src/webdriver/Edge/EdgeDriverService.cs

@@ -76,7 +76,7 @@ public static EdgeDriverService CreateDefaultService(EdgeOptions options)
         /// <returns>An EdgeDriverService using a random port.</returns>
         public static EdgeDriverService CreateDefaultService(string driverPath)
         {
-            if (Path.GetFileName(driverPath).Contains(MSEdgeDriverServiceFileName))
+            if (File.Exists(driverPath))
             {
                 driverPath = Path.GetDirectoryName(driverPath);
             }

dotnet/src/webdriver/Firefox/FirefoxDriverService.cs

@@ -230,7 +230,7 @@ public static FirefoxDriverService CreateDefaultService(FirefoxOptions options)
         /// <returns>A FirefoxDriverService using a random port.</returns>
         public static FirefoxDriverService CreateDefaultService(string driverPath)
         {
-            if (Path.GetFileName(driverPath) == FirefoxDriverServiceFileName())
+            if (File.Exists(driverPath))
             {
                 driverPath = Path.GetDirectoryName(driverPath);
             }

dotnet/src/webdriver/IE/InternetExplorerDriverService.cs

@@ -169,7 +169,7 @@ public static InternetExplorerDriverService CreateDefaultService(InternetExplore
         /// <returns>A InternetExplorerDriverService using a random port.</returns>
         public static InternetExplorerDriverService CreateDefaultService(string driverPath)
         {
-            if (Path.GetFileName(driverPath) == InternetExplorerDriverServiceFileName)
+            if (File.Exists(driverPath))
             {
                 driverPath = Path.GetDirectoryName(driverPath);
             }

dotnet/src/webdriver/Safari/SafariDriverService.cs

@@ -180,7 +180,7 @@ public static SafariDriverService CreateDefaultService(SafariOptions options)
         /// <returns>A SafariDriverService using a random port.</returns>
         public static SafariDriverService CreateDefaultService(string driverPath)
         {
-            if (Path.GetFileName(driverPath) == DefaultSafariDriverServiceExecutableName)
+            if (File.Exists(driverPath))
             {
                 driverPath = Path.GetDirectoryName(driverPath);
             }