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Layout - GetFormattedMessage with InvariantCulture#5777

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snakefoot merged 1 commit intoNLog:devfrom
snakefoot:LayoutTypeInvariant
Apr 12, 2025
Merged

Layout - GetFormattedMessage with InvariantCulture#5777
snakefoot merged 1 commit intoNLog:devfrom
snakefoot:LayoutTypeInvariant

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@snakefoot snakefoot commented Apr 12, 2025 •
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Resolves #5773 by always using InvariantCulture for both:

  • Layout.FromMethod - Type Layout
  • Layout.FromMethod - FuncLayoutRenderer

@snakefoot snakefoot added enhancement Improvement on existing feature breaking behavior change Same API, different result labels Apr 12, 2025
@snakefoot snakefoot added this to the 6.0 milestone Apr 12, 2025
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coderabbitai bot commented Apr 12, 2025 •
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Walkthrough

This pull request updates the string conversion logic in the logging system. In the FormatHelper class, the TryFormatToString method now checks if the value implements IConvertible and, if so, uses its ToString method with the provided format provider. Additionally, a null value now returns null rather than an empty string. Meanwhile, the FuncLayoutRenderer and Layout<T> classes have been updated to call TryFormatToString with different format provider parameters, reflecting changes in culture handling.

Changes

File(s) Change Summary
src/NLog/Internal/FormatHelper.cs Modified TryFormatToString: added a check for IConvertible to call ToString(formatProvider); now returns null when value is null instead of an empty string.
src/NLog/LayoutRenderers/FuncLayoutRenderer.cs
src/NLog/Layouts/Typed/Layout.cs		 Updated calls to TryFormatToString: in FuncLayoutRenderer, replaced a null format provider with the class's Culture property; in Layout<T>, the method now uses CultureInfo.InvariantCulture for conversion.

Sequence Diagram(s)

sequenceDiagram
    participant Caller
    participant FormatHelper
    participant Value

    Caller->>FormatHelper: TryFormatToString(value, ?, formatProvider)
    alt Value implements IConvertible
        FormatHelper->>Value: convertible.ToString(formatProvider)
        FormatHelper-->>Caller: formatted string
    else Value is null
        FormatHelper-->>Caller: null
    else
        FormatHelper->>Value: value?.ToString()
        FormatHelper-->>Caller: formatted string
    end
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sequenceDiagram
    participant FLR as FuncLayoutRenderer
    participant L as Layout<T>
    participant FH as FormatHelper

    FLR->>FH: TryFormatToString(value, null, GetFormatProvider(logEvent, Culture))
    L->>FH: TryFormatToString(objectValue, null, CultureInfo.InvariantCulture)
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Assessment against linked issues

Objective (Issue #5773) Addressed Explanation
Layout.FromMethod (Layout): should use LogEventInfo.FormatProvider rather than invariant culture ❌ The change now uses CultureInfo.InvariantCulture instead of allowing override via LogEventInfo.FormatProvider.
Layout.FromMethod (FuncLayoutRenderer): should always use InvariantCulture ❌ The update uses the class’s Culture property instead of enforcing InvariantCulture as specified in the linked issue.

Poem

I hop through lines of code so neat,
Checking types with a bounding beat.
With each format that’s redefined,
Culture settings now aligned.
A code rabbit sings, “Keep logs sweet!”
🐰✨ Happy hops in our logging treat!

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📥 Commits

Reviewing files that changed from the base of the PR and between e8fa0ef and 0667af3.

📒 Files selected for processing (3)
  • src/NLog/Internal/FormatHelper.cs (1 hunks)
  • src/NLog/LayoutRenderers/FuncLayoutRenderer.cs (1 hunks)
  • src/NLog/Layouts/Typed/Layout.cs (1 hunks)
🧰 Additional context used
🧬 Code Graph Analysis (2)
src/NLog/LayoutRenderers/FuncLayoutRenderer.cs (1)
src/NLog/Internal/FormatHelper.cs (2)
  • FormatHelper (38-87)
  • TryFormatToString (68-86)
src/NLog/Layouts/Typed/Layout.cs (3)
src/NLog/Internal/FormatHelper.cs (2)
  • FormatHelper (38-87)
  • TryFormatToString (68-86)
src/NLog/LayoutRenderers/LayoutRenderer.cs (1)
  • CultureInfo (233-236)
tests/NLog.UnitTests/NLogTestBase.cs (1)
  • CultureInfo (360-363)
🔇 Additional comments (4)
src/NLog/LayoutRenderers/FuncLayoutRenderer.cs (1)

107-107: Use of Culture property is now explicitly passed to the format provider.

The change ensures that the Culture property (which defaults to CultureInfo.InvariantCulture) is correctly passed to the TryFormatToString method, rather than passing null. This provides more consistent and predictable string formatting behavior, especially for culture-sensitive data.

src/NLog/Layouts/Typed/Layout.cs (1)

194-194: Improved string formatting with InvariantCulture.

This change standardizes string formatting by explicitly using CultureInfo.InvariantCulture when formatting messages. The null-coalescing operator ensures an empty string is returned when formatting fails, maintaining backward compatibility. This creates more predictable log output regardless of the environment's regional settings.

src/NLog/Internal/FormatHelper.cs (2)

74-77: Enhanced string conversion for IConvertible objects.

Adding explicit handling for IConvertible objects improves the formatting flexibility by using the provided format provider for culture-specific string conversion. This is a valuable enhancement that ensures proper culture handling for a wider range of object types.

84-84: More consistent null handling in string conversion.

The change from returning an empty string to returning null when value is null in the ToString call aligns the behavior with the other code paths in this method. This makes the API more consistent and allows the caller to determine how to handle null values.

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@snakefoot snakefoot enabled auto-merge (squash) April 12, 2025 09:07
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sonarqubecloud bot commented Apr 12, 2025

Quality Gate Passed Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

@snakefoot snakefoot merged commit b6c5c0c into NLog:dev Apr 12, 2025
6 checks passed
ana1250 pushed a commit to ana1250/NLog that referenced this pull request Apr 24, 2025
@snakefoot @ana1250
Layout - GetFormattedMessage with InvariantCulture (NLog#5777)
b4f071e
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Layout FromMethod with custom IFormatProvider

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