[dotnet] Annotate DriverServiceCommandExecutor for nullability

[RenderMichael]

User description

Thanks for contributing to Selenium!
A PR well described will help maintainers to quickly review and merge it

Before submitting your PR, please check our contributing guidelines.
Avoid large PRs, help reviewers by making them as simple and short as possible.

Description

Motivation and Context

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• I have read the contributing document.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

---

PR Type

Enhancement

---

Description

• Enhanced type safety by enabling nullable reference types in command executor classes
• Improved DriverServiceCommandExecutor implementation:
  • Added proper null checks in constructors with documented exceptions
  • Changed internalExecutor field to auto-implemented property HttpExecutor
  • Fixed disposal pattern by adding GC.SuppressFinalize
• Added XML documentation for constructor exceptions

---

Changes walkthrough 📝

Relevant files

Enhancement

DriverServiceCommandExecutor.cs Enhance nullability and improve command executor implementation dotnet/src/webdriver/Remote/DriverServiceCommandExecutor.cs Added nullable reference type annotations Changed internalExecutor field to property HttpExecutor Added null checks in constructors with proper exception documentation Improved disposal pattern with GC.SuppressFinalize +17/-15  ICommandServer.cs Enable nullable reference types                                                    dotnet/src/webdriver/Remote/ICommandServer.cs Added nullable reference type annotations +2/-0

---

💡 PR-Agent usage: Comment /help "your question" on any pull request to receive relevant information

[qodo-merge-pro]

PR Reviewer Guide 🔍

Here are some key observations to aid the review process:

⏱️ Estimated effort to review: 2 🔵🔵⚪⚪⚪

🧪 No relevant tests

🔒 No security concerns identified

⚡ Recommended focus areas for review Uninitialized Variable The toReturn variable is declared but may not be initialized if an exception occurs in the try block before assignment. Consider initializing it to null or a default value. Response toReturn; if (commandToExecute.Name == DriverCommand.NewSession) { this.service.Start(); } // Use a try-catch block to catch exceptions for the Quit // command, so that we can get the finally block. try { toReturn = await this.HttpExecutor.ExecuteAsync(commandToExecute).ConfigureAwait(false);

[qodo-merge-pro]

PR Code Suggestions ✨

Explore these optional code suggestions:

Category	Suggestion	Score
Possible issue	Prevent execution of commands on disposed objects to maintain proper object lifecycle Add a check for isDisposed in ExecuteAsync to prevent executing commands on a disposed instance, which could lead to unexpected behavior. dotnet/src/webdriver/Remote/DriverServiceCommandExecutor.cs [107-112] public async Task<Response> ExecuteAsync(Command commandToExecute) { + if (isDisposed) + { + throw new ObjectDisposedException(nameof(DriverServiceCommandExecutor)); + } if (commandToExecute == null) { throw new ArgumentNullException(nameof(commandToExecute), "Command to execute cannot be null"); } Apply this suggestion Suggestion importance[1-10]: 8 Why: This is a critical safety check that prevents potential bugs and resource-related issues by ensuring disposed objects cannot be used, following proper .NET disposal patterns.	8
General	Initialize local variables with default values to prevent potential uninitialized variable usage Initialize toReturn with a default value to ensure it's always assigned before use. The current code could lead to a compiler warning about uninitialized variable usage. dotnet/src/webdriver/Remote/DriverServiceCommandExecutor.cs [114-118] -Response toReturn; +Response toReturn = null!; if (commandToExecute.Name == DriverCommand.NewSession) { this.service.Start(); } Apply this suggestion Suggestion importance[1-10]: 3 Why: While the suggestion is technically correct for avoiding compiler warnings, the variable is guaranteed to be assigned in the try block before use, making this a minor improvement with minimal impact on code reliability.	3

[nvborisenko]

Thanks @RenderMichael !