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POAutoMapper custom type convert using ConstructServicesUsing
 

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  1. POAutoMapper custom type convert using ConstructServicesUsing
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    <p>According to the <a href="https://github.com/AutoMapper/AutoMapper/wiki/Containers" rel="nofollow">AutoMapper Documentation</a>, I should be able to create and use an instance of a Custom Type Converter using this:</p> <pre><code>var dest = Mapper.Map&lt;Source, Destination&gt;(new Source { Value = 15 }, opt =&gt; opt.ConstructServicesUsing(childContainer.GetInstance)); </code></pre> <p>I have the following source and destination types:</p> <pre><code>public class Source { public string Value1 { get; set; } public string Value2 { get; set; } public string Value3 { get; set; } } public class Destination { public int Value1 { get; set; } public DateTime Value2 { get; set; } public Type Value3 { get; set; } } </code></pre> <p>And the following type converters:</p> <pre><code>public class DateTimeTypeConverter : ITypeConverter&lt;string, DateTime&gt; { public DateTime Convert(ResolutionContext context) { return System.Convert.ToDateTime(context.SourceValue); } } public class SourceDestinationTypeConverter : ITypeConverter&lt;Source, Destination&gt; { public Destination Convert(ResolutionContext context) { var dest = new Destination(); // do some conversion return dest; } } </code></pre> <p>This simple test should assert that one of the date properties get converted correctly:</p> <pre><code>[TestFixture] public class CustomTypeConverterTest { [Test] public void ShouldMap() { Mapper.CreateMap&lt;string, DateTime&gt;().ConvertUsing(new DateTimeTypeConverter()); Mapper.CreateMap&lt;Source, Destination&gt;().ConstructUsingServiceLocator(); var destination = Mapper.Map&lt;Source, Destination&gt;( new Source { Value1 = "15", Value2 = "01/01/2000", }, options =&gt; options.ConstructServicesUsing( type =&gt; new SourceDestinationTypeConverter()) ); // exception is thrown here Assert.AreEqual(destination.Value2.Year, 2000); } } </code></pre> <p>But I already get an exception before the assert happens:</p> <p><code>System.InvalidCastException : Unable to cast object of type 'SourceDestinationTypeConverter ' to type 'Destination'</code>.</p> <p>My question now is, how do I use a custom type converter using <code>ConstructServicesUsing()</code>?</p>
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    1. USAlexander Zeitler
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    1. CODoes this help?: Mapper.CreateMap<Source, Destination>().ConstructUsingServiceLocator().ConvertUsing(new SourceDestinationTypeConverter());
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      1. USFrederik Prijck
    2. COOr Mapper.CreateMap<Source, Destination>().ConvertUsing(new SourceDestinationTypeConverter()); Both make the Assert succeed, but is any of them good for your situation?
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      1. POAutoMapper custom type convert using ConstructServicesUsing
      1. USFrederik Prijck
    3. COThanks, but I need to use the Mapper.Map-Method (instead of Mapper.CreateMap) as I need to pass in some runtime params.
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      1. USAlexander Zeitler
 

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