Compile-time logging source generation example triggers analyzer error "partial method must have an implementation part because it has accessibility modifiers"

[wjrogers]

When I write a class like the one in the example on this page,

public static partial class Log
{
    [LoggerMessage(
        EventId = 0,
        Level = LogLevel.Critical,
        Message = "Could not open socket to `{hostName}`")]
    public static partial void CouldNotOpenSocket(
        ILogger logger, string hostName);
}

the IDE flags it with an error:

Partial method 'void CouldNotOpenSocket(ILogger, string)' must have an implementation part because it has accessibility modifiers.

However, the code compiles and executes successfully. Will you please add some guidance to this page about this error, especially if there is a way to silence it?

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Document Details

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• ID: 6fc4ecf0-19e4-54d3-c34e-b6eadb80262b
• Version Independent ID: decc74aa-a2d5-8727-f22b-3862bacde737
• Content: Compile-time logging source generation
• Content Source: docs/core/extensions/logger-message-generator.md
• Product: dotnet-fundamentals
• GitHub Login: @maryamariyan
• Microsoft Alias: maariyan

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Associated WorkItem - 68965

[tdykstra]

@maryamariyan can you help with this question?

[maryamariyan]

thanks will take a look

[maryamariyan]

I got a repro for this. Thanks for your report @wjrogers.

@pranavkm what approach do you recommend to silence a diagnostic?

[pranavkm]

You could use a pragma warning suppress to do this: https://docs.microsoft.com/dotnet/fundamentals/code-analysis/suppress-warnings#use-a-preprocessor-directive

[dotnetshadow]

You could use a pragma warning suppress to do this: https://docs.microsoft.com/dotnet/fundamentals/code-analysis/suppress-warnings#use-a-preprocessor-directive

I did try the following but the error still came up

#pragma warning disable CS8795 // Rethrow to preserve stack details

Also the link to this doc produces an 404
https://docs.microsoft.com/en-us/dotnet/csharp/misc/sorry-we-don-t-have-specifics-on-this-csharp-error?f1url=%3FappId%3Droslyn%26k%3Dk(CS8795)

[maryamariyan]

Also the link to this doc produces an 404
https://docs.microsoft.com/en-us/dotnet/csharp/misc/sorry-we-don-t-have-specifics-on-this-csharp-error?f1url=%3FappId%3Droslyn%26k%3Dk(CS8795)

FYI, this issue is tracked by #23900

[ds185357]

I got the same behavior. The code compiles successfully, but VS with static analysis enabled produces CS8795 and CA1822. The CA1822 can be suppressed, CS8795 cannot.

[stap123]

I also get the CS8795 error for all methods. The project successfully compiles and works as expected but VS 2022 shows an error for every method.

I'm not sure this is actually a doc error and not a VS 2022 issue?