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Fix NullReferenceException when GetLockFile returns null (#740) - #741
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slang25 merged 1 commit intoMay 28, 2026
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…ated#740) Surface the underlying NuGet diagnostic by passing an ILogger to LockFileUtilities.GetLockFile, and throw a contextual error instead of a bare NRE when the lock file can't be loaded. Adds a logger-aware constructor overload to keep DotNetOutdatedTool.Core API compatible.
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Pull request overview
Fixes #740 by surfacing NuGet lock-file reader diagnostics and replacing an opaque NullReferenceException with a contextual InvalidOperationException when LockFileUtilities.GetLockFile returns null.
Changes:
- Add an
ILogger-aware constructor overload toProjectAnalysisService(keeping the 3-arg ctor for binary compatibility) and pass the logger toGetLockFile, plus null-check its result. - Register
ILoggerasConsoleLoggeratLogLevel.Warningin the CLI composition root. - Register the same
ILoggerin the MCP composition root.
Reviewed changes
Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.
| File | Description |
|---|---|
| src/DotNetOutdated.Core/Services/ProjectAnalysisService.cs | Adds logger field/overload, forwards logger to GetLockFile, and throws contextual exception on null lock file. |
| src/DotNetOutdated/Program.cs | Registers ConsoleLogger as ILogger in the CLI DI container. |
| src/DotNetOutdated/McpCommand.cs | Registers ConsoleLogger as ILogger in the MCP DI container. |
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slang25
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May 28, 2026
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Fixes #740.
ProjectAnalysisService.AnalyzeProjectAsyncwas passingNullLogger.InstancetoLockFileUtilities.GetLockFileand thendereferencing the result without a null check, so any failure to
load
project.assets.jsonsurfaced as an opaqueNullReferenceExceptionand the underlying NuGet diagnostic(when one was emitted) was silently discarded.
Changes:
ILoggertoGetLockFileso reader diagnostics reach the user.InvalidOperationExceptionProjectAnalysisService;the existing 3-arg constructor is preserved (delegates with
NullLogger.Instance) so the publishedDotNetOutdatedTool.Corelibrary stays binary-compatible.
ILogger(asConsoleLoggeratLogLevel.Warning) inthe CLI and MCP composition roots; MS.DI's greedy constructor
selection then prefers the new overload. This is not ideal, but I
could not find a better balance between the fix being "correct" and
too noisy.