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    copied!<p>The reason the <code>FormCollectionValueResolver&lt;Customer&gt;</code> never gets called is that the <code>ForAllMembers()</code> method iterates over all your property mappings, as defined by the <code>ForMember()</code> method, applying the specified member options. However, in the code sample you supplied no property mappings have been defined, thus the resolver never gets called.</p> <p>Here is an example of how the <code>ForAllMembers()</code> method could be used.</p> <pre><code>[Test] public void AutoMapperForAllMembersTest() { Mapper.CreateMap&lt;Source, Destination&gt;() .ForMember(dest =&gt; dest.Sum, opt =&gt; opt.ResolveUsing&lt;AdditionResolver&gt;()) .ForMember(dest =&gt; dest.Difference, opt =&gt; opt.ResolveUsing&lt;SubtractionResolver&gt;()) .ForAllMembers(opt =&gt; opt.AddFormatter&lt;CustomerFormatter&gt;()); Source source = new Source(); source.Expression = new Expression { LeftHandSide = 2, RightHandSide = 1 }; Destination destination = Mapper.Map&lt;Source, Destination&gt;(source); Assert.That(destination.Sum, Is.EqualTo("*3*")); Assert.That(destination.Difference, Is.EqualTo("*1*")); } public class Expression { public int LeftHandSide { get; set; } public int RightHandSide { get; set; } } public class Source { public Expression Expression { get; set; } } public class Destination { public string Sum { get; set; } public string Difference { get; set; } } public class AdditionResolver : ValueResolver&lt;Source, int&gt; { protected override int ResolveCore(Source source) { Expression expression = source.Expression; return expression.LeftHandSide + expression.RightHandSide; } } public class SubtractionResolver : ValueResolver&lt;Source, int&gt; { protected override int ResolveCore(Source source) { Expression expression = source.Expression; return expression.LeftHandSide - expression.RightHandSide; } } public class CustomerFormatter : IValueFormatter { public string FormatValue(ResolutionContext context) { return string.Format("*{0}*", context.SourceValue); } } </code></pre>
 

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