EfCore-Array-Of-String-Sample

Book.cs

public sealed class Book
{
    private List<string> _tags;

    private Book()
    {
        _tags = new List<string>();
    }
    public Book(string name)
    {
        Id = Guid.NewGuid();
        Name = name;
        _tags = new List<string>();
    }
    
    public Guid Id { get; }
    public string Name { get; }
    public IReadOnlyCollection<string> Tags => _tags.AsReadOnly();

    public void AddTag(params string[] tags) => _tags = new List<string>(_tags.Union(tags));
}

BookConfiguration.cs

using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Metadata.Builders;
using Sample.EFCore.ArrayPrimitiveTypes.Domain;
using Sample.EFCore.ArrayPrimitiveTypes.Storage.Converters;

namespace Sample.EFCore.ArrayPrimitiveTypes.Storage.Configurations;
public sealed class BookConfiguration : IEntityTypeConfiguration<Book>
{
    public void Configure(EntityTypeBuilder<Book> builder)
    {
        builder.ToContainer("Books");

        builder.HasKey(p => p.Id);
        builder.HasPartitionKey(p => p.Id);
        builder.Property(p => p.Id)
            .ToJsonProperty("id")
            .IsRequired();

        builder.Property(p => p.Name).IsRequired();

        builder.Property(p => p.Tags)
            .HasConversion<TagsValueConverter>();
    }
}

error.bash

Unhandled exception. System.InvalidOperationException: The property 'Book.Tags' is of type 'IReadOnlyCollection<string>' which is not supported by the current database provider. Either change the property CLR type, or ignore the property using the '[NotMapped]' attribute or by using 'EntityTypeBuilder.Ignore' in 'OnModelCreating'.
   at Microsoft.EntityFrameworkCore.Infrastructure.ModelValidator.ValidatePropertyMapping(IModel model, IDiagnosticsLogger`1 logger)
   at Microsoft.EntityFrameworkCore.Infrastructure.ModelValidator.Validate(IModel model, IDiagnosticsLogger`1 logger)
   at Microsoft.EntityFrameworkCore.Cosmos.Infrastructure.Internal.CosmosModelValidator.Validate(IModel model, IDiagnosticsLogger`1 logger)
   at Microsoft.EntityFrameworkCore.Infrastructure.ModelRuntimeInitializer.Initialize(IModel model, Boolean designTime, IDiagnosticsLogger`1 validationLogger)
   at Microsoft.EntityFrameworkCore.Infrastructure.ModelSource.GetModel(DbContext context, ModelCreationDependencies modelCreationDependencies, Boolean designTime)
   at Microsoft.EntityFrameworkCore.Internal.DbContextServices.CreateModel(Boolean designTime)
   at Microsoft.EntityFrameworkCore.Internal.DbContextServices.get_Model()
   at Microsoft.EntityFrameworkCore.Infrastructure.EntityFrameworkServicesBuilder.<>c.<TryAddCoreServices>b__8_4(IServiceProvider p)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitFactory(FactoryCallSite factoryCallSite, RuntimeResolverContext context)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor`2.VisitCallSiteMain(ServiceCallSite callSite, TArgument argument)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitCache(ServiceCallSite callSite, RuntimeResolverContext context, ServiceProviderEngineScope serviceProviderEngine, RuntimeResolverLock lockType)

TagsValueConverter.cs

using Microsoft.EntityFrameworkCore.Storage.ValueConversion;

namespace Sample.EFCore.ArrayPrimitiveTypes.Storage.Converters;

public class TagsValueConverter : ValueConverter<IReadOnlyCollection<string>, string[]>
{
    public TagsValueConverter() : base(
        value => value.ToArray(),
        dbValue => dbValue.ToList())
    {
    }
}