Use Microsoft.IO over System.IO#9869
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drewnoakes merged 1 commit intodotnet:mainfrom Dec 11, 2025
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When targeting .NET Framework, some commonly-used System.IO classes have worse performance than in .NET. They are also not null-annotated, which can allow bugs to slip through undetected. This change uses a global alias across the solution so that Path and Directory types come from the newer Microsoft.IO package/assembly. This gives us a reduction in allocations, access to newer methods (like Path.Join), and correct null annotations. All other changes here are in response to the user of the newer package, mostly around handling null values correctly.
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When targeting .NET Framework, some commonly-used System.IO classes have worse performance than in .NET. They are also not null-annotated, which can allow bugs to slip through undetected.
This change uses a global alias across the solution so that Path and Directory types come from the newer Microsoft.IO package/assembly. This gives us a reduction in allocations, access to newer methods (like Path.Join), and correct null annotations.
All other changes here are in response to the use of the newer package, mostly around handling null values correctly.