[dotnet] Start adding nullable reference type annotations to the Support package

dotnet/src/support/Events/FindElementEventArgs.cs

@@ -26,15 +26,12 @@ namespace OpenQA.Selenium.Support.Events
     /// </summary>
     public class FindElementEventArgs : EventArgs
     {
-        private IWebDriver driver;
-        private IWebElement element;
-        private By method;
-
         /// <summary>
         /// Initializes a new instance of the <see cref="FindElementEventArgs"/> class.
         /// </summary>
         /// <param name="driver">The WebDriver instance used in finding elements.</param>
-        /// <param name="method">The <see cref="By"/> object containing the method used to find elements</param>
+        /// <param name="method">The <see cref="By"/> object containing the method used to find elements.</param>
+        /// <exception cref="ArgumentNullException">If <paramref name="driver"/> or <paramref name="method"/> are <see langword="null"/>.</exception>
         public FindElementEventArgs(IWebDriver driver, By method)
             : this(driver, null, method)
         {
@@ -44,37 +41,29 @@ public FindElementEventArgs(IWebDriver driver, By method)
         /// Initializes a new instance of the <see cref="FindElementEventArgs"/> class.
         /// </summary>
         /// <param name="driver">The WebDriver instance used in finding elements.</param>
-        /// <param name="element">The parent element used as the context for the search.</param>
+        /// <param name="element">The parent element used as the context for the search, or <see langword="null"/> if none exists.</param>
         /// <param name="method">The <see cref="By"/> object containing the method used to find elements.</param>
-        public FindElementEventArgs(IWebDriver driver, IWebElement element, By method)
+        /// <exception cref="ArgumentNullException">If <paramref name="driver"/> or <paramref name="method"/> are <see langword="null"/>.</exception>
+        public FindElementEventArgs(IWebDriver driver, IWebElement? element, By method)
         {
-            this.driver = driver;
-            this.element = element;
-            this.method = method;
+            this.Driver = driver ?? throw new ArgumentNullException(nameof(driver));
+            this.Element = element;
+            this.FindMethod = method ?? throw new ArgumentNullException(nameof(method));
         }
 
         /// <summary>
         /// Gets the WebDriver instance used in finding elements.
         /// </summary>
-        public IWebDriver Driver
-        {
-            get { return this.driver; }
-        }
+        public IWebDriver Driver { get; }
 
         /// <summary>
-        /// Gets the parent element used as the context for the search.
+        /// Gets the parent element used as the context for the search, or <see langword="null"/> if no element is associated.
         /// </summary>
-        public IWebElement Element
-        {
-            get { return this.element; }
-        }
+        public IWebElement? Element { get; }
 
         /// <summary>
         /// Gets the <see cref="By"/> object containing the method used to find elements.
         /// </summary>
-        public By FindMethod
-        {
-            get { return this.method; }
-        }
+        public By FindMethod { get; }
     }
 }

dotnet/src/support/Events/GetShadowRootEventArgs.cs

@@ -26,34 +26,26 @@ namespace OpenQA.Selenium.Support.Events
     /// </summary>
     public class GetShadowRootEventArgs : EventArgs
     {
-        private IWebDriver driver;
-        private ISearchContext searchContext;
-
         /// <summary>
         /// Initializes a new instance of the <see cref="GetShadowRootEventArgs"/> class.
         /// </summary>
         /// <param name="driver">The WebDriver instance used in the current context.</param>
         /// <param name="searchContext">The parent searc context used as the context for getting shadow root.</param>
+        /// <exception cref="ArgumentNullException">If <paramref name="driver"/> or <paramref name="searchContext"/> are <see langword="null"/>.</exception>
         public GetShadowRootEventArgs(IWebDriver driver, ISearchContext searchContext)
         {
-            this.driver = driver;
-            this.searchContext = searchContext;
+            this.Driver = driver ?? throw new ArgumentNullException(nameof(driver));
+            this.SearchContext = searchContext ?? throw new ArgumentNullException(nameof(searchContext));
         }
 
         /// <summary>
         /// Gets the WebDriver instance used in the current context.
         /// </summary>
-        public IWebDriver Driver
-        {
-            get { return this.driver; }
-        }
+        public IWebDriver Driver { get; }
 
         /// <summary>
         /// Gets the parent search context used as the context for getting shadow root.
         /// </summary>
-        public ISearchContext SearchContext
-        {
-            get { return this.searchContext; }
-        }
+        public ISearchContext SearchContext { get; }
     }
 }

dotnet/src/support/Events/WebDriverExceptionEventArgs.cs

@@ -26,34 +26,26 @@ namespace OpenQA.Selenium.Support.Events
     /// </summary>
     public class WebDriverExceptionEventArgs : EventArgs
     {
-        private Exception thrownException;
-        private IWebDriver driver;
-
         /// <summary>
         /// Initializes a new instance of the <see cref="WebDriverExceptionEventArgs"/> class.
         /// </summary>
         /// <param name="driver">The WebDriver instance throwing the exception.</param>
         /// <param name="thrownException">The exception thrown by the driver.</param>
+        /// <exception cref="ArgumentNullException">If <paramref name="driver"/> or <paramref name="thrownException"/> are <see langword="null"/>.</exception>
         public WebDriverExceptionEventArgs(IWebDriver driver, Exception thrownException)
         {
-            this.driver = driver;
-            this.thrownException = thrownException;
+            this.Driver = driver ?? throw new ArgumentNullException(nameof(driver));
+            this.ThrownException = thrownException ?? throw new ArgumentNullException(nameof(thrownException));
         }
 
         /// <summary>
         /// Gets the exception thrown by the driver.
         /// </summary>
-        public Exception ThrownException
-        {
-            get { return this.thrownException; }
-        }
+        public Exception ThrownException { get; }
 
         /// <summary>
-        /// Gets the WebDriver instance .
+        /// Gets the WebDriver instance.
         /// </summary>
-        public IWebDriver Driver
-        {
-            get { return this.driver; }
-        }
+        public IWebDriver Driver { get; }
     }
 }

dotnet/src/support/Events/WebDriverNavigationEventArgs.cs

@@ -26,13 +26,11 @@ namespace OpenQA.Selenium.Support.Events
     /// </summary>
     public class WebDriverNavigationEventArgs : EventArgs
     {
-        private string url;
-        private IWebDriver driver;
-
         /// <summary>
         /// Initializes a new instance of the <see cref="WebDriverNavigationEventArgs"/> class.
         /// </summary>
         /// <param name="driver">The WebDriver instance used in navigation.</param>
+        /// <exception cref="ArgumentNullException">If <paramref name="driver"/> is <see langword="null"/>.</exception>
         public WebDriverNavigationEventArgs(IWebDriver driver)
             : this(driver, null)
         {
@@ -42,27 +40,22 @@ public WebDriverNavigationEventArgs(IWebDriver driver)
         /// Initializes a new instance of the <see cref="WebDriverNavigationEventArgs"/> class.
         /// </summary>
         /// <param name="driver">The WebDriver instance used in navigation.</param>
-        /// <param name="url">The URL navigated to by the driver.</param>
-        public WebDriverNavigationEventArgs(IWebDriver driver, string url)
+        /// <param name="url">The URL navigated to by the driver, or <see langword="null"/> if none exists.</param>
+        /// <exception cref="ArgumentNullException">If <paramref name="driver"/> is <see langword="null"/>.</exception>
+        public WebDriverNavigationEventArgs(IWebDriver driver, string? url)
         {
-            this.url = url;
-            this.driver = driver;
+            this.Url = url;
+            this.Driver = driver ?? throw new ArgumentNullException(nameof(driver));
         }
 
         /// <summary>
-        /// Gets the URL navigated to by the driver.
+        /// Gets the URL navigated to by the driver, or <see langword="null"/> if no URL could be determined.
         /// </summary>
-        public string Url
-        {
-            get { return this.url; }
-        }
+        public string? Url { get; }
 
         /// <summary>
         /// Gets the WebDriver instance used in navigation.
         /// </summary>
-        public IWebDriver Driver
-        {
-            get { return this.driver; }
-        }
+        public IWebDriver Driver { get; }
     }
 }

dotnet/src/support/Events/WebDriverScriptEventArgs.cs

@@ -26,34 +26,26 @@ namespace OpenQA.Selenium.Support.Events
     /// </summary>
     public class WebDriverScriptEventArgs : EventArgs
     {
-        private IWebDriver driver;
-        private string script;
-
         /// <summary>
         /// Initializes a new instance of the <see cref="WebDriverScriptEventArgs"/> class.
         /// </summary>
         /// <param name="driver">The WebDriver instance used to execute the script.</param>
         /// <param name="script">The script executed by the driver.</param>
+        /// <exception cref="ArgumentNullException">If <paramref name="driver"/> or <paramref name="script"/> are <see langword="null"/>.</exception>
         public WebDriverScriptEventArgs(IWebDriver driver, string script)
         {
-            this.driver = driver;
-            this.script = script;
+            this.Driver = driver ?? throw new ArgumentNullException(nameof(driver));
+            this.Script = script ?? throw new ArgumentNullException(nameof(script));
         }
 
         /// <summary>
         /// Gets the WebDriver instance used to execute the script.
         /// </summary>
-        public IWebDriver Driver
-        {
-            get { return this.driver; }
-        }
+        public IWebDriver Driver { get; }
 
         /// <summary>
         /// Gets the script executed by the driver.
         /// </summary>
-        public string Script
-        {
-            get { return this.script; }
-        }
+        public string Script { get; }
     }
 }

dotnet/src/support/Events/WebElementEventArgs.cs

@@ -26,34 +26,26 @@ namespace OpenQA.Selenium.Support.Events
     /// </summary>
     public class WebElementEventArgs : EventArgs
     {
-        private IWebDriver driver;
-        private IWebElement element;
-
         /// <summary>
         /// Initializes a new instance of the <see cref="WebElementEventArgs"/> class.
         /// </summary>
         /// <param name="driver">The WebDriver instance used for the action.</param>
         /// <param name="element">The element used for the action.</param>
+        /// <exception cref="ArgumentNullException">If <paramref name="driver"/> or <paramref name="element"/> are <see langword="null"/>.</exception>
         public WebElementEventArgs(IWebDriver driver, IWebElement element)
         {
-            this.driver = driver;
-            this.element = element;
+            this.Driver = driver ?? throw new ArgumentNullException(nameof(driver));
+            this.Element = element ?? throw new ArgumentNullException(nameof(element));
         }
 
         /// <summary>
         /// Gets the WebDriver instance used for the action.
         /// </summary>
-        public IWebDriver Driver
-        {
-            get { return this.driver; }
-        }
+        public IWebDriver Driver { get; }
 
         /// <summary>
         /// Gets the element used for the action.
         /// </summary>
-        public IWebElement Element
-        {
-            get { return this.element; }
-        }
+        public IWebElement Element { get; }
     }
 }

dotnet/src/support/Events/WebElementValueEventArgs.cs

@@ -17,6 +17,8 @@
 // under the License.
 // </copyright>
 
+using System;
+
 namespace OpenQA.Selenium.Support.Events
 {
     /// <summary>
@@ -30,15 +32,16 @@ public class WebElementValueEventArgs : WebElementEventArgs
         /// <param name="driver">The WebDriver instance used for the action.</param>
         /// <param name="element">The element used for the action.</param>
         /// <param name="value">The new value for the element.</param>
-        public WebElementValueEventArgs(IWebDriver driver, IWebElement element, string value)
+        /// <exception cref="ArgumentNullException">If <paramref name="driver"/> or <paramref name="element"/> are <see langword="null"/>.</exception>
+        public WebElementValueEventArgs(IWebDriver driver, IWebElement element, string? value)
             : base(driver, element)
         {
             this.Value = value;
         }
 
         /// <summary>
-        /// Gets the Value that is written to the element
+        /// Gets the Value that is written to the element.
         /// </summary>
-        public string Value { get; private set; }
+        public string? Value { get; }
     }
 }