How to use the new CompositeFormat class from .NET 8.0?

Question

I'm testing migrating a .NET 6.0 application to .NET 8.0, and the following piece of code now throws CA1863 "Use 'CompositeFormat'". But I don't know how.

private const string DUMP_DIALOGS_TITLE_FORMAT_STRING = "{0} Diagnostic Report";

public static string GetTitle(IProcess currentProcess)
{
    return string.Format(CultureInfo.InvariantCulture, DUMP_DIALOGS_TITLE_FORMAT_STRING, currentProcess.ProcessName);
}

The example given here is invalid, since the StaticField variable isn't initialized and I don't know what it should be.

If I change the code to

private static readonly CompositeFormat Format = CompositeFormat.Parse("{0} Diagnostic Report");

public static string GetTitle(IProcess currentProcess)
{
    return string.Format(CultureInfo.InvariantCulture, Format, currentProcess.ProcessName);
}

Visual Studio shows a warning that I'm not providing a parameter for the {0} argument, even though everything appears to work as expected (I'm not getting a runtime error with the new code). Is it just that VS code analysis isn't knowing about CompositeFormat yet or am I missing something?

Doubling Edgars's observation, here dotnet.microsoft.com/en-us/download/dotnet/8.0 it states that .NET 8 is supported by Visual Studio 2022 (v17.8) — Renat
– Renat, Commented Nov 28, 2023 at 12:24
I have v17.9 Preview 1, so I'm assuming it should be supported, too. I have also Resharper installed, which might be the culpit here. — PMF
– PMF, Commented Nov 28, 2023 at 12:25

Guru Stron · Accepted Answer · 2023-12-01 09:27:00Z

4

Your implementation is just fine:

private static readonly CompositeFormat Format = CompositeFormat.Parse("{0} Diagnostic Report");

public static string GetTitle(IProcess currentProcess)
{
    return string.Format(CultureInfo.InvariantCulture, Format, currentProcess.ProcessName);
}

The warning comes from ReSharper which currently has only basic support of .NET 8 features (see the .NET SDK support in JetBrains Rider doc.).

Either install the EAP/RC version (link) which should have the issue fixed or disable the warning with comment for now:

// ReSharper disable once FormatStringProblem
private static readonly CompositeFormat Format = CompositeFormat.Parse("{0} Diagnostic Report");

P.S.

Created a PR for the docs to make example potentially more clear.

edited Dec 1, 2023 at 9:27

answered Nov 29, 2023 at 12:24

Guru Stron

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