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POIssue with custom TypeConverter and nested properties in the designer
 

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  1. POIssue with custom TypeConverter and nested properties in the designer
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    <p>I'm trying to add a nested property to my custom control using a TypeConverter, here is my test code:</p> <pre><code>public class TestNestedOptionConverter : TypeConverter { public override PropertyDescriptorCollection GetProperties(ITypeDescriptorContext context, object value, Attribute[] filter) { return TypeDescriptor.GetProperties(typeof(TestNestedOption)); } public override bool GetPropertiesSupported(ITypeDescriptorContext context) { return true; } } [TypeConverter(typeof(TestNestedOptionConverter))] public class TestNestedOption { bool test1 = false; [Description("TestParam1")] public bool Test1 { get { return test1; } set { test1 = value; } } [Description("TestParam2")] public int Test2 { get; set; } } public partial class UserControl1 : UserControl { public TestNestedOption TestOption { get; set; } public UserControl1() { InitializeComponent(); } } </code></pre> <p>When I add the control to a form, I see the TestOption property in the designer property grid, but the sub-properties do not show up at all (there isn't even an expansion box next to TestOption). </p> <p>My understanding of this is that it is supposed to sort of recursively call the <code>GetProperties()</code> method on each property, so as a test hack I put a <code>MessageBox.Show()</code> in the <code>TestNestedOptionConverter.GetProperties()</code> method, and I don't see the message when the designer loads the control. This makes me think that the overridden <code>GetProperties()</code> is never being called by the designer for some reason.</p> <p>Any ideas about what I am doing wrong?</p> <p>I'm using Visual Studio 2008.</p>
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