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COMPOSITE0009: Repeating syntax used on non-collection property

Property Value
Rule ID COMPOSITE0009
Category CompositeKey.SourceGeneration
Severity Error

Cause

The template uses repeating syntax ({Property...separator}) for a property that is not a supported collection type.

Supported collection types are:

  • IReadOnlyList<T>
  • List<T>
  • ImmutableArray<T>

How to fix

Either change the property to a supported collection type or remove the repeating syntax:

// Before (error — Guid is not a collection)
[CompositeKey("{Id...#}")]
public sealed partial record MyKey(Guid Id);

// After (fixed — use a collection type)
[CompositeKey("{Ids...#}")]
public sealed partial record MyKey(IReadOnlyList<Guid> Ids);