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Settings - Mapping readonly properties

docs/articles/settings/custom/Mapping-readonly-prop.md

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Non public setter

Mapster can map to non public setter automatically.

csharp
public class Order {
    public string Id { get; set; }
    public ICollection<OrderItem> Items { get; private set; }
}

Using UseDestinationValue attribute

You can make your type pure readonly and annotate with [UseDestinationValue].

csharp
public class Order {
    public string Id { get; set; }

    [UseDestinationValue]
    public ICollection<OrderItem> Items { get; } = new List<OrderItem>();
}

Convention based setup using UseDestinationValue Extension Method

Or you can apply without annotate each type, for example, if you would like all readonly ICollection<> to use destination value.

csharp
TypeAdapterConfig.GlobalSettings.Default
    .UseDestinationValue(member => member.SetterModifier == AccessModifier.None &&
                                   member.Type.IsGenericType &&
                                   member.Type.GetGenericTypeDefinition() == typeof(ICollection<>));