Steven Giesel • 4/1/2024

Pattern matching and the compiler can be surprising

This technical article examines a specific C# pattern matching scenario where the compiler generates a CS8602 warning for dereferencing a possibly null reference, despite explicit null checks in the pattern. It analyzes the lowered IL code to explain the compiler's static analysis limitations and demonstrates a rare edge case that could lead to a NullReferenceException due to property side effects.

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#c #Pattern Matching #Compiler Warnings