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Editorial Team
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Asked: 2026-05-13T17:21:09+00:00

It looks like an IValueFormatter takes a value of type object and returns a

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It looks like an IValueFormatter takes a value of type object and returns a value of type string, while a ValueResolver<TSource, TDestination> takes a value of any type and returns a value of any type. So, it’s more flexible. There is also the matter that, with a ValueResolver, you never need to cast the source to a particular type–you define it explicitly in your class definition.

Given this, why use IValueFormatter? Does it do anything that can’t be done with ValueResolver? Am I misunderstanding how it works?

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  1. Editorial Team

    The big difference is that formatters can be applied at the member, profile, type and global level. So you can do something like “ForSourceType.AddFormatter() in a profile, and now blammo! All your decimals now show up as money. Resolvers are strictly for custom member mapping.

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