EF Core complex type workaround.cs

// Entity Framework reference type
public class Class1
{
    // Not mapped by EF
    public ComplexType ComplexProperty { get; set; }


    // Mapped by EF convention
    private string ComplexProperty_Prop1
    {
        get { return ComplexProperty.Prop1; }
        set { ComplexProperty = ComplexProperty.WithProp1(value); }
    }
    private int ComplexProperty_Prop2
    {
        get { return ComplexProperty.Prop2; }
        set { ComplexProperty = ComplexProperty.WithProp2(value); }
    }
    private string ComplexProperty_Prop3_Prop1
    {
        get { return ComplexProperty.Prop3.Prop1; }
        set { ComplexProperty = ComplexProperty.WithProp3(ComplexProperty.Prop3.WithProp1(value)); }
    }
    private int ComplexProperty_Prop3_Prop2
    {
        get { return ComplexProperty.Prop3.Prop2; }
        set { ComplexProperty = ComplexProperty.WithProp3(ComplexProperty.Prop3.WithProp2(value)); }
    }
}

// Immutable value type
public struct ComplexType
{
    public ComplexType(string prop1, int prop2, NestedComplexType prop3)
    {
        Prop1 = prop1;
        Prop2 = prop2;
        Prop3 = prop3;
    }

    public string Prop1 { get; }
    public int Prop2 { get; }
    public NestedComplexType Prop3 { get; }

    public ComplexType WithProp1(string value) => new ComplexType(value, Prop2, Prop3);
    public ComplexType WithProp2(int value) => new ComplexType(Prop1, value, Prop3);
    public ComplexType WithProp3(NestedComplexType value) => new ComplexType(Prop1, Prop2, value);
}

// Immutable value type
public struct NestedComplexType
{
    public NestedComplexType(string prop1, int prop2)
    {
        Prop1 = prop1;
        Prop2 = prop2;
    }

    public string Prop1 { get; }
    public int Prop2 { get; }

    public NestedComplexType WithProp1(string value) => new NestedComplexType(value, Prop2);
    public NestedComplexType WithProp2(int value) => new NestedComplexType(Prop1, value);
}