[dotnet] Enable NRT on exceptional types

dotnet/src/webdriver/DefaultFileDetector.cs

@@ -16,6 +16,10 @@
 // limitations under the License.
 // </copyright>
 
+#nullable enable
+
+using System.Diagnostics.CodeAnalysis;
+
 namespace OpenQA.Selenium
 {
     /// <summary>
@@ -30,7 +34,11 @@ public class DefaultFileDetector : IFileDetector
         /// </summary>
         /// <param name="keySequence">The sequence to test for file existence.</param>
         /// <returns>This method always returns <see langword="false"/> in this implementation.</returns>
-        public bool IsFile(string keySequence)
+        public bool IsFile(
+#if NET
+            [NotNullWhen(true)]
+#endif
+        string? keySequence)
         {
             return false;
         }

dotnet/src/webdriver/DetachedShadowRootException.cs

@@ -17,7 +17,8 @@
 // </copyright>
 
 using System;
-using System.Runtime.Serialization;
+
+#nullable enable
 
 namespace OpenQA.Selenium
 {
@@ -40,7 +41,7 @@ public DetachedShadowRootException()
         /// a specified error message.
         /// </summary>
         /// <param name="message">The message that describes the error.</param>
-        public DetachedShadowRootException(string message)
+        public DetachedShadowRootException(string? message)
             : base(message)
         {
         }
@@ -53,7 +54,7 @@ public DetachedShadowRootException(string message)
         /// <param name="message">The error message that explains the reason for the exception.</param>
         /// <param name="innerException">The exception that is the cause of the current exception,
         /// or <see langword="null"/> if no inner exception is specified.</param>
-        public DetachedShadowRootException(string message, Exception innerException)
+        public DetachedShadowRootException(string? message, Exception? innerException)
             : base(message, innerException)
         {
         }

dotnet/src/webdriver/DevTools/CommandResponseException.cs

@@ -18,6 +18,8 @@
 
 using System;
 
+#nullable enable
+
 namespace OpenQA.Selenium.DevTools
 {
     /// <summary>
@@ -38,7 +40,7 @@ public CommandResponseException()
         /// Initializes a new instance of the <see cref="CommandResponseException"/> class with the specified message.
         /// </summary>
         /// <param name="message">The message of the exception.</param>
-        public CommandResponseException(string message)
+        public CommandResponseException(string? message)
             : base(message)
         {
         }
@@ -48,7 +50,7 @@ public CommandResponseException(string message)
         /// </summary>
         /// <param name="message">The message of the exception.</param>
         /// <param name="innerException">The inner exception for this exception.</param>
-        public CommandResponseException(string message, Exception innerException)
+        public CommandResponseException(string? message, Exception? innerException)
             : base(message, innerException)
         {
         }

dotnet/src/webdriver/DriverServiceNotFoundException.cs

@@ -17,12 +17,13 @@
 // </copyright>
 
 using System;
-using System.Runtime.Serialization;
+
+#nullable enable
 
 namespace OpenQA.Selenium
 {
     /// <summary>
-    /// The exception that is thrown when an element is not visible.
+    /// The exception that is thrown when the driver service is not available.
     /// </summary>
     [Serializable]
     public class DriverServiceNotFoundException : WebDriverException
@@ -40,7 +41,7 @@ public DriverServiceNotFoundException()
         /// a specified error message.
         /// </summary>
         /// <param name="message">The message that describes the error.</param>
-        public DriverServiceNotFoundException(string message)
+        public DriverServiceNotFoundException(string? message)
             : base(message)
         {
         }
@@ -53,7 +54,7 @@ public DriverServiceNotFoundException(string message)
         /// <param name="message">The error message that explains the reason for the exception.</param>
         /// <param name="innerException">The exception that is the cause of the current exception,
         /// or <see langword="null"/> if no inner exception is specified.</param>
-        public DriverServiceNotFoundException(string message, Exception innerException)
+        public DriverServiceNotFoundException(string? message, Exception? innerException)
             : base(message, innerException)
         {
         }

dotnet/src/webdriver/ElementClickInterceptedException.cs

@@ -17,7 +17,8 @@
 // </copyright>
 
 using System;
-using System.Runtime.Serialization;
+
+#nullable enable
 
 namespace OpenQA.Selenium
 {
@@ -40,7 +41,7 @@ public ElementClickInterceptedException()
         /// a specified error message.
         /// </summary>
         /// <param name="message">The message that describes the error.</param>
-        public ElementClickInterceptedException(string message)
+        public ElementClickInterceptedException(string? message)
             : base(message)
         {
         }
@@ -53,7 +54,7 @@ public ElementClickInterceptedException(string message)
         /// <param name="message">The error message that explains the reason for the exception.</param>
         /// <param name="innerException">The exception that is the cause of the current exception,
         /// or <see langword="null"/> if no inner exception is specified.</param>
-        public ElementClickInterceptedException(string message, Exception innerException)
+        public ElementClickInterceptedException(string? message, Exception? innerException)
             : base(message, innerException)
         {
         }

dotnet/src/webdriver/ElementNotInteractableException.cs

@@ -17,12 +17,13 @@
 // </copyright>
 
 using System;
-using System.Runtime.Serialization;
+
+#nullable enable
 
 namespace OpenQA.Selenium
 {
     /// <summary>
-    /// The exception that is thrown when an element is not visible.
+    /// The exception that is thrown when an element is not interactable.
     /// </summary>
     [Serializable]
     public class ElementNotInteractableException : InvalidElementStateException
@@ -40,7 +41,7 @@ public ElementNotInteractableException()
         /// a specified error message.
         /// </summary>
         /// <param name="message">The message that describes the error.</param>
-        public ElementNotInteractableException(string message)
+        public ElementNotInteractableException(string? message)
             : base(message)
         {
         }
@@ -53,7 +54,7 @@ public ElementNotInteractableException(string message)
         /// <param name="message">The error message that explains the reason for the exception.</param>
         /// <param name="innerException">The exception that is the cause of the current exception,
         /// or <see langword="null"/> if no inner exception is specified.</param>
-        public ElementNotInteractableException(string message, Exception innerException)
+        public ElementNotInteractableException(string? message, Exception? innerException)
             : base(message, innerException)
         {
         }

dotnet/src/webdriver/ElementNotSelectableException.cs

@@ -17,12 +17,13 @@
 // </copyright>
 
 using System;
-using System.Runtime.Serialization;
+
+#nullable enable
 
 namespace OpenQA.Selenium
 {
     /// <summary>
-    /// The exception that is thrown when an element is not visible.
+    /// The exception that is thrown when an element is not selectable.
     /// </summary>
     [Serializable]
     public class ElementNotSelectableException : InvalidElementStateException
@@ -40,7 +41,7 @@ public ElementNotSelectableException()
         /// a specified error message.
         /// </summary>
         /// <param name="message">The message that describes the error.</param>
-        public ElementNotSelectableException(string message)
+        public ElementNotSelectableException(string? message)
             : base(message)
         {
         }
@@ -53,7 +54,7 @@ public ElementNotSelectableException(string message)
         /// <param name="message">The error message that explains the reason for the exception.</param>
         /// <param name="innerException">The exception that is the cause of the current exception,
         /// or <see langword="null"/> if no inner exception is specified.</param>
-        public ElementNotSelectableException(string message, Exception innerException)
+        public ElementNotSelectableException(string? message, Exception? innerException)
             : base(message, innerException)
         {
         }

dotnet/src/webdriver/ElementNotVisibleException.cs

@@ -17,7 +17,8 @@
 // </copyright>
 
 using System;
-using System.Runtime.Serialization;
+
+#nullable enable
 
 namespace OpenQA.Selenium
 {
@@ -40,7 +41,7 @@ public ElementNotVisibleException()
         /// a specified error message.
         /// </summary>
         /// <param name="message">The message that describes the error.</param>
-        public ElementNotVisibleException(string message)
+        public ElementNotVisibleException(string? message)
             : base(message)
         {
         }
@@ -53,7 +54,7 @@ public ElementNotVisibleException(string message)
         /// <param name="message">The error message that explains the reason for the exception.</param>
         /// <param name="innerException">The exception that is the cause of the current exception,
         /// or <see langword="null"/> if no inner exception is specified.</param>
-        public ElementNotVisibleException(string message, Exception innerException)
+        public ElementNotVisibleException(string? message, Exception? innerException)
             : base(message, innerException)
         {
         }

dotnet/src/webdriver/ErrorResponse.cs

@@ -18,14 +18,16 @@
 
 using System.Collections.Generic;
 
+#nullable enable
+
 namespace OpenQA.Selenium
 {
     /// <summary>
     /// Provides a way to store errors from a response
     /// </summary>
     public class ErrorResponse
     {
-        private StackTraceElement[] stackTrace;
+        private StackTraceElement[]? stackTrace;
         private string message = string.Empty;
         private string className = string.Empty;
         private string screenshot = string.Empty;
@@ -42,52 +44,41 @@ public ErrorResponse()
         /// </summary>
         /// <param name="responseValue">A <see cref="Dictionary{K, V}"/> containing names and values of
         /// the properties of this <see cref="ErrorResponse"/>.</param>
-        public ErrorResponse(Dictionary<string, object> responseValue)
+        public ErrorResponse(Dictionary<string, object?>? responseValue)
         {
             if (responseValue != null)
             {
-                if (responseValue.ContainsKey("message"))
+                if (responseValue.TryGetValue("message", out object? messageObj)
+                    && messageObj?.ToString() is string message)
                 {
-                    if (responseValue["message"] != null)
-                    {
-                        this.message = responseValue["message"].ToString();
-                    }
-                    else
-                    {
-                        this.message = "The error did not contain a message.";
-                    }
+                    this.message = message;
                 }
-
-                if (responseValue.ContainsKey("screen") && responseValue["screen"] != null)
+                else
                 {
-                    this.screenshot = responseValue["screen"].ToString();
+                    this.message = "The error did not contain a message.";
                 }
 
-                if (responseValue.ContainsKey("class") && responseValue["class"] != null)
+                if (responseValue.TryGetValue("screen", out object? screenObj)
+                    && screenObj?.ToString() is string screen)
                 {
-                    this.className = responseValue["class"].ToString();
+                    this.screenshot = screen;
                 }
 
-                if (responseValue.ContainsKey("stackTrace") || responseValue.ContainsKey("stacktrace"))
+                if (responseValue.TryGetValue("class", out object? classObj)
+                    && classObj?.ToString() is string @class)
                 {
-                    object[] stackTraceArray = null;
-
-                    if (responseValue.ContainsKey("stackTrace"))
-                    {
-                        stackTraceArray = responseValue["stackTrace"] as object[];
-                    }
-                    else if (responseValue.ContainsKey("stacktrace"))
-                    {
-                        stackTraceArray = responseValue["stacktrace"] as object[];
-                    }
+                    this.className = @class;
+                }
 
-                    if (stackTraceArray != null)
+                if (responseValue.TryGetValue("stackTrace", out object? stackTraceObj)
+                    || responseValue.TryGetValue("stacktrace", out stackTraceObj))
+                {
+                    if (stackTraceObj is object?[] stackTraceArray)
                     {
                         List<StackTraceElement> stackTraceList = new List<StackTraceElement>();
-                        foreach (object rawStackTraceElement in stackTraceArray)
+                        foreach (object? rawStackTraceElement in stackTraceArray)
                         {
-                            Dictionary<string, object> elementAsDictionary = rawStackTraceElement as Dictionary<string, object>;
-                            if (elementAsDictionary != null)
+                            if (rawStackTraceElement is Dictionary<string, object?> elementAsDictionary)
                             {
                                 stackTraceList.Add(new StackTraceElement(elementAsDictionary));
                             }
@@ -130,7 +121,7 @@ public string Screenshot
         /// <summary>
         /// Gets or sets the stack trace of the error
         /// </summary>
-        public StackTraceElement[] StackTrace
+        public StackTraceElement[]? StackTrace
         {
             get { return this.stackTrace; }
             set { this.stackTrace = value; }