+1  A: 

Place a TypeConverter attribute on each property too..

leppie  2009-03-11 14:06:04
I have a TypeConverter on the class itself. However, to ensure that there wasn't a trick to it, I did place a TypeConverter (that converts to/from string) on an attribute to see if it worked. It didn't. =(
Jerry  2009-03-11 14:13:55
Sorry :( Have you tried providing a common base class or interface, if possible? If not, you might have to revert to some magic with property descriptors and ensure you return the same instance (of the PropertyDescriptor) for all instances.
leppie  2009-03-11 14:51:36
+1  A: 

From your description it seems you are talking about the effectiveDiameter of type double. But in your sample you are showing a UITypeEditor for the umConversion class. So, please clarify.

If you are in the second case, where your property is actually a class of your own and not a primitive type, then ensure to implement the Equals method. The MultiPropertyDescriptorGridEntry class in the MS PropertyGrid calls Equals to know if all target instances have the same value. Not sure if this is your problem, but I would test that to eliminate this possibility.

Nicolas Cadilhac  2009-03-11 14:41:02
YOU ARE A GENIUS!!!I had a "Equals()" test, but there was a typo in it. THAT was my problem all along. THANK YOU SO VERY VERY MUCH!!!!
Jerry  2009-03-11 15:07:32

related questions

Displaying Flash content in a C# WinForms application
How to get the value of built, encoded ViewState?
Unhandled Exception Handler in .NET 1.1
How do I connect to a database and loop over a recordset in C#?
How do I most elegantly express left join with aggregate SQL as LINQ query
Get a new object instance from a Type in C#
.NET Testing Framework Advice
Automatically update version number
What is the difference between an int and an Integer in Java/C#?
How to write to Web.Config in Medium Trust ?
WinForms ComboBox data binding gotcha
How do you sort a C# dictionary by value?
Adding Scripting functionality to .NET applications
Floating Point Number parsing: Is there a Catch All algorithm?
How do I print an HTML document from a web service?
Decoding T-SQL CAST in C#/VB.net
Anatomy of a "Memory Leak"
How do I get a distinct, ordered list of names from a DataTable using Linq
Reliable Timer in a Console Application
How do I fill a DataSet or a DataTable from a LINQ query resultset ?
What's the difference between Math.Floor() and Math.Truncate() in .NET?
How do I calculate relative time?
How do I calculate someone's age in C#?
Are there any conversion tools for porting Visual J# code to C#?
When setting a form's opacity should I use a decimal or double?