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First let me say thanks for stopping by my site. My name is David Hanson-Graville and I am a IT consultant working in the UK. Let me make it clear, I am passionate about technology and specifically .net and its various forms. I've programmed in a range of langages, but I can say, I am now at my happiest when coding with c#. I hope my blog is an enjoyable & educational read and please feel free to email me at David.Hanson@OnTheBlog.net if you have any questions. 
WPF: Could not create an instance of type '{0}' Minimize
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Posted by: David Hanson Fri, 25 Apr 2008 09:10:57 GMT

If you get this error in your designer when working with XAML in Visual Studio 2008...make sure you dont have any visual elements that inherit from an abstract class.  May seem obvious but can be easily missed.

Could not create an instance of type '{0}'
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Re: WPF: Could not create an instance of type '{0}'    By entro on Sun, 13 Jul 2008 14:33:15 GMT
Thanx for the tip!!! <br>I was having the same problem... and the fact that my program would run fine... but could not show a specific form in xaml designer was driving me nuts...<br><br>It somehow looks obvious... just after you find out what was wrong with it at the first place....
Re: WPF: Could not create an instance of type '{0}'    By . on Tue, 23 Sep 2008 16:10:12 GMT
Thanks a lot! After installing VS2008, SP1, I had the same problem, classes derived from an abstract base class could not be loaded any more into the VS designer, showing the error "Could not create an instance of type <BaseClass>. At runtime, no problems occurred. Before SP1, the designer worked fine with these classes.
Re: WPF: Could not create an instance of type '{0}'    By David Hanson on Tue, 23 Sep 2008 16:12:51 GMT
Your welcome, it is a particulary annoying bug this one!
Re: WPF: Could not create an instance of type '{0}'    By Nguyen Van Hiep on Tue, 08 Sep 2009 06:57:52 GMT
Hi, I have the same error when update VS 2008 to SP1. Can you show me how to fix it? In my program, I don't know what visual elements that inherit from an abstract class. Thank a lot !
Re: WPF: Could not create an instance of type '{0}'    By Manish on Tue, 08 Sep 2009 06:58:05 GMT
Thank you for pointing out..i am also getting that. Can this be solved so that we can see design view?
Re: WPF: Could not create an instance of type '{0}'    By Khoa on Tue, 08 Sep 2009 06:58:23 GMT
Your shared information saved a few of my nerves that are left :). All I needed was to remove the abstract keyword from my base user control. Thank you!

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