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copied!<p>You are already creating a collection like this:</p> <pre><code>PropertyDescriptorCollection propsCollection = new PropertyDescriptorCollection(instanceProps.Cast<PropertyDescriptor>().ToArray()); </code></pre> <p>But the collection you are creating only has the existing properties, not your new properties.</p> <p>You need to supply a single array concatenated from the existing properties and your new properties.</p> <p>Something like this:</p> <pre><code>instanceProps.Cast<PropertyDescriptor>().Concat(customProperties).ToArray() </code></pre> <p>Next problem: you need <code>customProperties</code> which is a collection of <code>PropertyDescriptor</code>. Unfortunately <code>PropertyDescriptor</code> is an abstract class so you don't have an easy way to create one.</p> <p>We can fix this though, just define your own <code>CustomPropertyDescriptor</code> class by deriving from <code>PropertyDescriptor</code> and implementing all the abstract methods.</p> <p>Something like this:</p> <pre><code>public class CustomPropertyDescriptor : PropertyDescriptor { private Type propertyType; private Type componentType; public CustomPropertyDescriptor(string propertyName, Type propertyType, Type componentType) : base(propertyName, new Attribute[] { }) { this.propertyType = propertyType; this.componentType = componentType; } public override bool CanResetValue(object component) { return true; } public override Type ComponentType { get { return componentType; } } public override object GetValue(object component) { return 0; /* your code here to get a value */; } public override bool IsReadOnly { get { return false; } } public override Type PropertyType { get { return propertyType; } } public override void ResetValue(object component) { SetValue(component, null); } public override void SetValue(object component, object value) { /* your code here to set a value */; } public override bool ShouldSerializeValue(object component) { return true; } } </code></pre> <p>I haven't filled in the calls to get and set your properties; those calls depend on how you've implemented the dynamic properties under the hood.</p> <p>Then you need to create an array of <code>CustomPropertyDescriptor</code> filled in with information appropriate to your dynamic properties, and concatenate it to the basic properties as I described initially.</p> <p>The <code>PropertyDescriptor</code> not only <strong>describes</strong> your properties, it also enables client to actually get and set the values of those properties. And that's the whole point, isn't it!</p>

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