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POAttribute.IsDefined doesn't see attributes applied with MetadataType class
 

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    <p><strong>If I apply attributes to a partial class via the <a href="http://msdn.microsoft.com/en-us/library/system.componentmodel.dataannotations.metadatatypeattribute.aspx" rel="nofollow noreferrer">MetadataType attribute</a>, those attributes are not found via <a href="http://msdn.microsoft.com/en-us/library/system.attribute.isdefined(VS.85).aspx" rel="nofollow noreferrer">Attribute.IsDefined()</a>.</strong> Anyone know why, or what I'm doing wrong?</p> <p>Below is a test project I created for this, but I'm really trying to apply custom attributes to a LINQ to SQL entity class - like <a href="https://stackoverflow.com/questions/393687/how-can-i-add-my-attributes-to-code-generated-linq2sql-classes-properties/667119#667119">this answer in this question</a>.</p> <p>Thanks!</p> <pre><code>using System; using System.ComponentModel.DataAnnotations; using System.Reflection; namespace MetaDataTest { class Program { static void Main(string[] args) { PropertyInfo[] properties = typeof(MyTestClass).GetProperties(); foreach (PropertyInfo propertyInfo in properties) { Console.WriteLine(Attribute.IsDefined(propertyInfo, typeof(MyAttribute))); Console.WriteLine(propertyInfo.IsDefined(typeof(MyAttribute), true)); Console.WriteLine(propertyInfo.GetCustomAttributes(true).Length); // Displays: // False // False // 0 } Console.ReadLine(); } } [MetadataType(typeof(MyMeta))] public partial class MyTestClass { public string MyField { get; set; } } public class MyMeta { [MyAttribute()] public string MyField { get; set; } } [AttributeUsage(AttributeTargets.All)] public class MyAttribute : System.Attribute { } } </code></pre>
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