Hi,
in the xamPropertyGrid I need to set a property value from a list of available values found in a list. I want the selectable values to end up in a combo box in the property grid.
From my initial investigation I find that a way to do this (at least in other property editors) is to use a TypeConverter attribute on my property and implement the TypeConverter.StandardValuesCollection GetStandardValues(ITypeDescriptorContext context) method to generate the list of available options. However, when I try this with the xamPropertyGrid I get passed a context of null in this (and related) TypeConverter methods, making it difficult to use anything but a static list of options.
Is there a way to set up a type converter with a proper context for the xamPropertyGrid, or is there an alternative way to get the combo-box experience I need ?
Regards,Leif
This issue was fixed in the December 2015 Service Release.
Hello Leif,
Thank you for your post and sample.
I have logged this behavior with our developers in our tracking system, with an issue ID of 208362. I have also created a support ticket on your behalf with number CAS-165663-W5L9T8 in order to link the development issue to it so that you are automatically updated when a Service Release containing your fix is available for download.
Sincerely,
Horen
Software Developer
Infragistics
www.infragistics.com/support
Hi
Attached is a simple sample application that shows what I mean. The object to be displayed has a single public property, Option, that can have a number of different values that are generated from a dynamic list in the data model. The property editor should display these values in a drop-down box.
The sample uses a custom TypeConverter to get the drop-down behavior 'for free'. However, the type converter methods in the sample always get passed a null value for the ITypeDescriptorContext arguments, which makes it difficult to get access to the parent object of the property when filling the list of available options. As far as I understand, a normal behavior is to e.g. pass a reference to the parent object in the context's Instance property. In the sample, code that uses such information is wrapped within a #ifdef block.
I guess that setting a property value from a list of dynamic options in a drop-down is a common usage scenario for the XamPropertyGrid, so there may be other patterns that makes this possible without using a TypeConverter. However, if the XamPropertyGrid could pass a proper context to the TypeConverter methods, this feature would be a no-brainer.
Thank you for your post.
Could you please send me an isolated sample application where I can reproduce your issue. This way I would be able to further investigate this for you and provide you with more detailed information on this matter.
Looking forward to hearing from you