Clarify record type definition with primary constructors #48110
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BillWagner
approved these changes
Aug 26, 2025
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| :::code language="csharp" source="./snippets/structured-output/Program.cs" id="InputOutputRecord"::: | ||
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| (This record type is defined using [primary constructor](../../csharp/programming-guide/classes-and-structs/instance-constructors.md#primary-constructors) syntax. Primary constructors, which are available in C# 12 and later versions, combine the class definition with the parameters that are necessary to instantiate any instance of the class. The C# compiler generates public properties for the primary constructor parameters.) |
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First, should this be a NOTE? Second, primary constructors on record types have been available since C# 9: C# 9 added record types (record class). C# 10 added record struct types. C# 12 allowed primary constructors on class and struct types that aren't records. And, primary constructor parameters generate public properties for record types only. That seems like a side quest in this article. So, maybe something like this:
Suggested change
| (This record type is defined using [primary constructor](../../csharp/programming-guide/classes-and-structs/instance-constructors.md#primary-constructors) syntax. Primary constructors, which are available in C# 12 and later versions, combine the class definition with the parameters that are necessary to instantiate any instance of the class. The C# compiler generates public properties for the primary constructor parameters.) | |
| (This record type is defined using [primary constructor](../../csharp/programming-guide/classes-and-structs/instance-constructors.md#primary-constructors) syntax. Primary constructors have been available for `record` types since C# 9.0, are available for all types in C# 12 and later versions. Primary constructors combine the class definition with the parameters that are necessary to instantiate any instance of the class. The C# compiler generates public properties in `record` types for the primary constructor parameters.) |
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Fixes #47512.
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