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Improve error message when duplicate enum definitions are registered. #3493

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Improve error message when duplicate enum definitions are registered. #3493

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9 changes: 8 additions & 1 deletion src/EFCore.PG/Storage/Internal/NpgsqlTypeMappingSource.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -785,7 +785,14 @@ static Type FindTypeToInstantiate(Type collectionType, Type elementType)
EnumDefinition? enumDefinition;
if (storeType is null)
{
enumDefinition = _enumDefinitions.SingleOrDefault(m => m.ClrType == clrType);
var matches = _enumDefinitions.Where(m => m.ClrType == clrType).ToList();
if (matches.Count > 1)
{
throw new InvalidOperationException(
$"Multiple enum definitions registered for CLR type '{clrType?.FullName}'. ");
}

enumDefinition = matches.FirstOrDefault();

if (enumDefinition is null)
{
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