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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 Editor | Inspection Settings page of JetBrains Rider settings CtrlAlt0S.

  • Solution-wide analysis: select Enable solution-wide analysis on the Editor | Inspection Settings page of JetBrains Rider settings CtrlAlt0S.

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: