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11-runtime-target-type-mapping.md

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Runtime target type mapping

If the target type of a mapping is not known at compile time, a mapping method with a Type parameter can be used. Mapperly implements this mapping method using all mappings the user defined in the mapper.

[Mapper]
public static partial class ModelMapper
{
    // highlight-start
    public static partial object Map(object source, Type targetType);
    // highlight-end

    private static partial BananaDto MapBanana(Banana source);
    private static partial AppleDto MapApple(Apple source);
}

class Banana {}
class Apple {}

class BananaDto {}
class AppleDto {}

If the source or target type of a runtime target type mapping is not object, only user mappings of which the source/target type is assignable to the source/target type of the mapping method are considered.

Runtime target type mappings support derived type mappings. The MapDerivedTypeAttribute can be directly applied to a runtime target type mapping method.

:::info Mapperly runtime target type mappings only support source/target type combinations which are defined as mappings in the same mapper. If an unknown source/target type combination is provided at runtime, an ArgumentException is thrown. :::