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POHow do I exclude Enum properties with EF4/CTP5 fluent mappings in a generic fashion?
 

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  1. POHow do I exclude Enum properties with EF4/CTP5 fluent mappings in a generic fashion?
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    <p>I am just diving into the use of code-first with CTP5 for Entity Framework. To ease the pain of configuring the database mappings I've created myself a little helper class to serve as the base class for any custom mappings, but I'm unable to figure out how to make the last statement in the method work.</p> <p>I am locating all public properties of type Enum and then calling the .Ignore method for every property found on the given type. The code uses Fasterflect for reflection and a little ForEach helper, but it should be fairly obvious what the code does.</p> <pre><code>internal abstract class AbstractMappingProvider&lt;T&gt; : IMappingProvider where T : class { public EntityTypeConfiguration&lt;T&gt; Map { get; private set; } public virtual void DefineModel( ModelBuilder modelBuilder ) { Map = modelBuilder.Entity&lt;T&gt;(); Map.ToTable( typeof(T).Name ); typeof(T).Properties( Flags.Public | Flags.Instance ) .Where( p =&gt; p.PropertyType.IsEnum ) .ForEach( p =&gt; Map.Ignore( e =&gt; p ) ); } } </code></pre> <p>Executing the above gives me the following error:</p> <pre><code>System.InvalidOperationException: The expression 'e =&gt; value(Domain.AbstractMappingProvider`1+&lt;&gt;c__DisplayClass3[Domain.User]).p' is not a valid property expression. It must be of the form 'e =&gt; e.Property'. </code></pre> <p>How can I use the "p" (which is in fact a property on "e") to make this not just compile but also work? :o) </p> <p>I'm hoping someone has a clever trick to solve this. Alternatives solutions are welcome, but remember that the whole idea is to avoid having to call Map.Ignore for every enumeration property.</p>
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    1. USMorten Mertner
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    1. COI'm still looking for a working solution to this problem, as the answer given below merely is a pointer in the direction to take, but doesn't get into the nitty-gritty details of constructing the right expression.
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      1. USMorten Mertner
 

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