如何添加 derived class 属性 EF Core

Question

我正在进行迁移，但没有看到继承者 class 的属性。我有下一个模型。在 class SomeClass 中，我有正确显示的虚拟属性，但是在 class 中继承时，没有显示

    public class School
    {
        [Key]
        public long Id { get; init; }
       
        [Column(TypeName = "jsonb")]
        public SomeClass Parameter1 { get; set; }
    }

    public class SomeClass
    {
        public virtual ParameterTypes Type { get; }
    }

    public enum ParameterTypes
    {
        None,
        
        Value
    }
    
    
    public class DerivedClass : SomeClass
    {
        public override ParameterTypes Type => ParameterTypes.Value;
        
        public string Value { get; set; }
    }

我正在添加配置此模型

    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        base.OnModelCreating(modelBuilder);
        
        modelBuilder.Entity<School>(
            builder =>
            {
                builder.HasKey(h => h.Id);
                builder.Property(h => h.Parameter1).HasJsonConversion();
            });
    }
    
    public static PropertyBuilder<T> HasJsonConversion<T>(this PropertyBuilder<T> propertyBuilder)
            where T : class, new()
    {
        var converter = new ValueConverter<T, string>(
            v => JsonSerializer.Serialize(v, null),
            v => JsonSerializer.Deserialize<T>(v, null) ?? new T());

        var comparer = new ValueComparer<T>(
            (l, r) => JsonSerializer.Serialize(l, null) == JsonSerializer.Serialize(r, null),
            v => v == null ? 0 : JsonSerializer.Serialize(v, null).GetHashCode(),
            v => JsonSerializer.Deserialize<T>(JsonSerializer.Serialize(v, null), null)
        );

        propertyBuilder.HasConversion(converter);
        propertyBuilder.Metadata.SetValueConverter(converter);
        propertyBuilder.Metadata.SetValueComparer(comparer);
        propertyBuilder.HasColumnType("jsonb");

        return propertyBuilder;
    }

当我进行迁移时，我将枚举视为一个字符串（右），但我没有看到属性 DerivedClass.Value

也许问题出在 HasJsonConversion 方法中？

如何从继承的 class 中得到属性？

Answer 1

var converter = new ValueConverter<T, string>(
     v => JsonSerializer.Serialize(v, **v.GetType()**, jsonSerializerOptions),
     v => JsonSerializer.Deserialize<T>(v, jsonSerializerOptions));

如何添加 derived class 属性 EF Core

How add derived class property EF Core

.net

c#

entity-framework

entity-framework-core