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Code inspection: Property can be made init-only (non-private accessibility)

Last modified: 27 May 2024

This inspection identifies properties that are only initialized in a constructor and suggests replacing their set accessor with the init accessor.

The init accessor in C# 9.0 and onwards allows properties to be made immutable in a more flexible way than before. Unlike with a readonly field or get-only property, an init-only property can be set only during object initialization. This helps maintain the immutability of objects after they are created, leading to safer and often simpler code.

For the solution-wide inspection to work, you need to enable at least one of the following:

  • Simplified global usage checking: select Show unused non-private type members when solution-wide analysis is off on the Code Inspection | Settings page of ReSharper options Alt+R, O.

  • Solution-wide analysis: select Enable solution-wide analysis on the Code Inspection | Settings page of ReSharper options Alt+R, O.

Note that even if the reported accessor has no direct usages in your solution, there could be cases where it is used indirectly — for example, via reflection — or it could just be designed as public API. In all those cases, you would want to suppress the usage-checking inspection for the accessor in one of the following ways: