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  1. PO
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    <p>You need to change</p> <pre class="lang-cs prettyprint-override"><code>.ForMember(dest =&gt; dest.ShirtColor, dest =&gt; dest.Condition(src =&gt; src.ShirtColor != null)) </code></pre> <p>to</p> <pre class="lang-cs prettyprint-override"><code>.ForMember(dest =&gt; dest.ShirtColor, opt =&gt; opt.Condition(src =&gt; !src.IsSourceValueNull)) </code></pre> <p>Note that you also don't need the following as they are mapped by convention:</p> <pre class="lang-cs prettyprint-override"><code>.ForMember(dest =&gt; dest.FirstName, opt =&gt; opt.MapFrom(src =&gt; src.FirstName)) .ForMember(dest =&gt; dest.LastName, opt =&gt; opt.MapFrom(src =&gt; src.LastName)) </code></pre> <hr> <p><strong>UPDATE - 2</strong></p> <p>The problem is related to the fact that the condition and mapping haven't been combined. I've created a simple extension method to allow for it.</p> <p>Here is a test to demonstrate it</p> <p><strong>Classes</strong></p> <pre class="lang-cs prettyprint-override"><code>public class Person { public string FirstName { get; set; } public string LastName { get; set; } } public class PersonA : Person { public int? ShirtColor { get; set; } } public class PersonB : Person { public OptionSetValue ShirtColor { get; set; } } public class OptionSetValue { public int OptionSet { get; set; } } </code></pre> <p><strong>MappingConfiguration</strong></p> <pre class="lang-cs prettyprint-override"><code>public class MyProfile : Profile { protected override void Configure() { Mapper.CreateMap&lt;PersonA, PersonB&gt;() .ForMember(dest =&gt; dest.ShirtColor, opt =&gt; opt.ConditionallyMapFrom( src =&gt; new OptionSetValue { OptionSet = src.ShirtColor.Value }, src =&gt; src.ShirtColor.HasValue)); } } public static class AutoMapperExtensions { public static void ConditionallyMapFrom&lt;TSource, TMember&gt;( this IMemberConfigurationExpression&lt;TSource&gt; expression, Expression&lt;Func&lt;TSource, TMember&gt;&gt; sourceMember, Func&lt;TSource, bool&gt; condition) { expression.Condition(condition); expression.MapFrom(sourceMember); } } </code></pre> <p><strong>UnitTests</strong></p> <pre class="lang-cs prettyprint-override"><code>[TestFixture] public class MappingTests { [Test] public void AutoMapper_Configuration_IsValid() { Mapper.Initialize(m =&gt; m.AddProfile&lt;MyProfile&gt;()); Mapper.AssertConfigurationIsValid(); } [Test] public void AutoMapper_ClientMapping_IsValid() { Mapper.Initialize(m =&gt; m.AddProfile&lt;MyProfile&gt;()); Mapper.AssertConfigurationIsValid(); var source = new PersonA { FirstName = "FirstA", LastName = "LastA", ShirtColor = null }; var destination = new PersonB { FirstName = "FirstB", LastName = "LastB" }; destination = Mapper.Map(source, destination); Assert.That(destination, Is.Not.Null); Assert.That(destination.FirstName, Is.EqualTo("FirstA")); Assert.That(destination.LastName, Is.EqualTo("LastA")); Assert.That(destination.ShirtColor, Is.Null); } } </code></pre>
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    1. POWhy am I getting a "Nullable object must have a value" exception when I'm using Condition?
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    1. USMightymuke
    1. USMightymuke
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    1. COThank you for your response, but this didn't fix it. Strings don't seem to exhibit the problem. If you changed ShirtColor to a nullable int (int?) in one class and a class in the other (OptionSetValue - class with one int property), you will see that the problem still exists. This has something to do with the target property being a class, which is the only time I see it.
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      1. USDavid Yates
    2. COOK cool, thanks for the update - I've now been able to recreate it. Will see if I can find a workaround.
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      1. USMightymuke
    3. COI've updated the answer based on your updated criteria - or rather, new knowledge of your previous criteria :)
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      1. USMightymuke
 

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