?? and ??= operators - null-coalescing operators - C# | Microsoft …
https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/operators/null-coalescing-operator
WebJul 27, 2023 · The left-hand operand of the ??= operator must be a variable, a property, or an indexer element. The type of the left-hand operand of the ?? and ??= operators can't be a non-nullable value type. In particular, you can use the null-coalescing operators with unconstrained type parameters:
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