[🐛 Bug]: [dotnet] Null check on ISupportsPrint.Print is different from parameter name

What happened?

ISupportsPrint.Print(options: null); // <- throws parameter 'printOptions' is null

How can we reproduce the issue?

WebDriver driver = new ChromeDriver();
((ISupportsPrint)driver).Print(options: null); // <- throws parameter 'printOptions' is null

Relevant log output

N/A

Operating System

Windows 11

Selenium version

.NET nightly

What are the browser(s) and version(s) where you see this issue?

N/A

What are the browser driver(s) and version(s) where you see this issue?

N/A

Are you using Selenium Grid?

No

@RenderMichael

@RenderMichael, thank you for creating this issue. We will troubleshoot it as soon as we can.

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Thank you!

This is caused by a mismatch in parameter names between the interface ISupportsPrint.Print(options) and the implementing type WebDriver.Print(printOptions). This is considered incorrect (for reasons such as this one) but fixing it directly is a breaking change. We can do something like this:

class WebDriver
{
    void ISupportsPrint.Print(PrintOptions options)
    {
        if (options is null)
        {
            throw new ArgumentNullException(nameof(options));
        }

        Print(printOptions: options);
    }
}

This would throw an exception with the right parameter name, whether a user goes through the interface or the type. We can factor out the double null-check if that's desired.

Edit: Default Interface Methods are not supported on .NET Standard 2.0, so this could only be applied to .NET 8.

Let's fix it, selenium doesn't follow SemVer. To negotiate this "minor" breaking change we will reflect this change in Blog post (automatically will be included).

If we create a commit something like [dotnet] [breaking change] printOptions parameter name in Print method renamed to options, then it is enough. And, of course, reflect it in CHANGELOG when releasing.

This PR can be closed as #14773 is merged which fixes it.

This issue is stale because it has been open 280 days with no activity. Remove stale label or comment or this will be closed in 14 days.

This issue is stale because it has been open 180 days with no activity. Remove stale label or comment or this will be closed in 14 days.

This issue was closed because it has been stalled for 14 days with no activity.

This issue has been automatically locked since there has not been any recent activity since it was closed. Please open a new issue for related bugs.

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[🐛 Bug]: [dotnet] Null check on `ISupportsPrint.Print` is different from parameter name #14784

What happened?

How can we reproduce the issue?

Relevant log output

Operating System

Selenium version

What are the browser(s) and version(s) where you see this issue?

What are the browser driver(s) and version(s) where you see this issue?

Are you using Selenium Grid?

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[🐛 Bug]: [dotnet] Null check on ISupportsPrint.Print is different from parameter name #14784

Description

What happened?

How can we reproduce the issue?

Relevant log output

Operating System

Selenium version

What are the browser(s) and version(s) where you see this issue?

What are the browser driver(s) and version(s) where you see this issue?

Are you using Selenium Grid?

Activity

github-actions commented on Nov 20, 2024

RenderMichael commented on Nov 21, 2024

nvborisenko commented on Dec 1, 2024

Delta456 commented on Dec 20, 2024

github-actions commented on Jun 18, 2025

github-actions commented on Dec 16, 2025

github-actions commented on Jun 16, 2026

github-actions commented on Jul 1, 2026

github-actions commented on Jul 31, 2026

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[🐛 Bug]: [dotnet] Null check on `ISupportsPrint.Print` is different from parameter name #14784