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Auto Binding to object with nullable enums

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PropertyGrid
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Oscar Ågren
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Oscar Ågren asked on 08 Aug 2012, 09:19 AM
Hi,

I cant bind to an object with nullable enums using auto generated properties.
I get a silent error for every nullable enum property
System.Windows.Data Error: 1 : Cannot create default converter to perform 'two-way' conversions between types 'System.Nullable`1[Data.EF5.Enumerations.Unit]' and 'System.String'. Consider using Converter property of Binding. BindingExpression:Path=Unit1; DataItem='Mb' (HashCode=13923471); target element is 'TextBox' (Name=''); target property is 'Text' (type 'String')


Part of the enum looks like this (localized)

[TypeConverter(typeof(EnumToLocalizedName))]
   public enum Unit:int
   {
       [Display(Description = " ", ResourceType = typeof(Resources.Resource))]
       Unit0,
       [Display(Description = "°C", ResourceType = typeof(Resources.Resource))]
       Unit1
   ....
}

Non-nullable enums shows up in a combobox. How can I show my nullable enums the same way, without losing localization?

Thanks

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Ivan Ivanov
Telerik team
answered on 13 Aug 2012, 11:17 AM
Hi,

Currently nullable enums are not supported by RadPropertyGrid in scenarios with auto-generated fields. We will do our best to add this feature in some of our future internal builds. I will write to you, in order to notify you as soon as the mentioned version is available. 

All the best,
Ivan Ivanov
the Telerik team

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Oscar Ågren
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answered on 13 Aug 2012, 12:42 PM
Okey, thanks for clarifying. I was able to work around the nullable requirement. 

Still one problem remaining. How can I localize the enum names for the combobox? My typeconverter attribute is ignored. What attributes does the PropertyGrid require? Thanks
0
Ivan Ivanov
Telerik team
answered on 16 Aug 2012, 12:57 PM
Hi,

 We will need some more time, in order to check this. I will contact you tomorrow, in order to notify you of the results of our research. Please, excuse me for this delay.

Regards,
Ivan Ivanov
the Telerik team

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Ivan Ivanov
Telerik team
answered on 20 Aug 2012, 11:11 AM
Hi,

We have tested this scenario on our side and it appears that currently there is no easy workaround for this scenario. Would it be possible for you to use a non-nullable enum property and add a value that would mimic the null value, in the enum definition? The internal build that introduces support for Nullable enums will be released later today/tomorrow, but unfortunately the TypeConverter is not yet working properly with it.

All the best,
Ivan Ivanov
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Oscar Ågren
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answered on 20 Aug 2012, 10:56 PM
I have removed all nullable enums, it wasn't that big a loss, all I want now is to get localization for my non nullable enums. What would be the practiced pattern? Thanks
0
Ivan Ivanov
Telerik team
answered on 24 Aug 2012, 01:38 PM
Hi,

It seems that the EnumDataSource that we internally use in RadPropertyGrid fails to invoke the TypeConverter properly. We will need some more time to investigate this. I will contact you as soon as we have any updates.

All the best,
Ivan Ivanov
the Telerik team

Explore the entire Telerik portfolio by downloading Telerik DevCraft Ultimate.

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Oscar Ågren
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Ivan Ivanov
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Oscar Ågren
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