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    <p>To go down this route, you would need to create a custom <code>PropertyDescriptor</code> per property. You would then expose that via a custom <code>TypeConverter</code>, or (alternatively) <code>ICustomTypeDescriptor</code>/<code>TypeDescriptionProvider</code>. Example:</p> <pre><code>using System; using System.Collections.Generic; using System.ComponentModel; using System.Windows.Forms; [TypeConverter(typeof(CustomObjectType.CustomObjectConverter))] public class CustomObjectType { [Category("Standard")] public string Name { get; set; } private readonly List&lt;CustomProperty&gt; props = new List&lt;CustomProperty&gt;(); [Browsable(false)] public List&lt;CustomProperty&gt; Properties { get { return props; } } private Dictionary&lt;string, object&gt; values = new Dictionary&lt;string, object&gt;(); public object this[string name] { get { object val; values.TryGetValue(name, out val); return val; } set { values.Remove(name); } } private class CustomObjectConverter : ExpandableObjectConverter { public override PropertyDescriptorCollection GetProperties(ITypeDescriptorContext context, object value, Attribute[] attributes) { var stdProps = base.GetProperties(context, value, attributes); CustomObjectType obj = value as CustomObjectType; List&lt;CustomProperty&gt; customProps = obj == null ? null : obj.Properties; PropertyDescriptor[] props = new PropertyDescriptor[stdProps.Count + (customProps == null ? 0 : customProps.Count)]; stdProps.CopyTo(props, 0); if (customProps != null) { int index = stdProps.Count; foreach (CustomProperty prop in customProps) { props[index++] = new CustomPropertyDescriptor(prop); } } return new PropertyDescriptorCollection(props); } } private class CustomPropertyDescriptor : PropertyDescriptor { private readonly CustomProperty prop; public CustomPropertyDescriptor(CustomProperty prop) : base(prop.Name, null) { this.prop = prop; } public override string Category { get { return "Dynamic"; } } public override string Description { get { return prop.Desc; } } public override string Name { get { return prop.Name; } } public override bool ShouldSerializeValue(object component) { return ((CustomObjectType)component)[prop.Name] != null; } public override void ResetValue(object component) { ((CustomObjectType)component)[prop.Name] = null; } public override bool IsReadOnly { get { return false; } } public override Type PropertyType { get { return prop.Type; } } public override bool CanResetValue(object component) { return true; } public override Type ComponentType { get { return typeof(CustomObjectType); } } public override void SetValue(object component, object value) { ((CustomObjectType)component)[prop.Name] = value; } public override object GetValue(object component) { return ((CustomObjectType)component)[prop.Name] ?? prop.DefaultValue; } } } public class CustomProperty { public string Name { get; set; } public string Desc { get; set; } public object DefaultValue { get; set; } Type type; public Type Type { get { return type; } set { type = value; DefaultValue = Activator.CreateInstance(value); } } } static class Program { [STAThread] static void Main() { Application.EnableVisualStyles(); var obj = new CustomObjectType { Name = "Foo", Properties = { new CustomProperty { Name = "Bar", Type = typeof(int), Desc = "I'm a bar"}, new CustomProperty { Name = "When", Type = typeof(DateTime), Desc = "When it happened"}, } }; Application.Run(new Form { Controls = { new PropertyGrid { SelectedObject = obj, Dock = DockStyle.Fill } } }); } } </code></pre>
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    1. POHow to display a dynamic object in property grid?
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    1. USMarc Gravell
    1. USMarc Gravell
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    1. CO"To go down this route" - is there a more elegant way to achieve this?
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    2. CO@Marc Gravell, `CustomObjectType.this[string].set{}` should be `values[name] = value;` if properties are to be modified. Great bit of code, BTW.
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