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DataForm with enum filed throws exception on Android.
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John
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John asked on 12 Jul 2017, 04:00 PM

I need to have a language select drop down on a data form so I used a language enum as one of the properties on the view model. The drop-down works fine on UWP but throws an exception when rendering on Android. It works fine on Android if I change the field type to string instead of enum. Here is the view model:

public class AppConfiguration
    {
    [DisplayOptions(Header = "API URL")]
    public string ApiUrl { get; set; }
 
    [DisplayOptions(Header = "Preferred Culture")]
    [Ignore]
    public string Culture { get; set; }
 
    public enum LanguageChoices { English, French };
 
    //[DisplayOptions(Header = "Preferred Language")]
    //public string LanguageChoice
    //  {
    //  get
    //      {
    //      if(string.IsNullOrEmpty(Culture))
    //          Culture="en-CA";
    //      switch(Culture.Substring(0, 2).ToLower())
    //          {
    //      case "en":
    //          return "English";
    //      case "fr":
    //          return "French";
    //      default:
    //          return "English";
    //          }
    //      }
    //  set
    //      {
    //      switch(value.Substring(0, 2).ToLower())
    //          {
    //      case "fr":
    //          Culture="fr-CA";
    //          break;
    //      case "en":
    //          Culture="en-CA";
    //          break;
    //      default:
    //          Culture="en-CA";
    //          break;
    //          }
    //      }
    //  }
 
    [DisplayOptions(Header = "Preferred Language")]
    public LanguageChoices LanguageChoice
        {
        get
            {
            if(string.IsNullOrEmpty(Culture))
                Culture="en-CA";
            switch(Culture.Substring(0, 2).ToLower())
                {
            case "en":
                return LanguageChoices.English;
            case "fr":
                return LanguageChoices.French;
            default:
                return LanguageChoices.English;
                }
            }
        set
            {
            switch(value)
                {
            case LanguageChoices.French:
                Culture="fr-CA";
                break;
            case LanguageChoices.English:
                Culture="en-CA";
                break;
            default:
                Culture="en-CA";
                break;
                }
            }
        }
    }

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John
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answered on 13 Jul 2017, 01:41 PM

Just to make sure that there was nothing else in my program aggravating the issue, I was able to reproduce the problem in the Telerik SDKBrowswer sample simply by adding the following lines to SourceItem.cs in the DataForms sample:

public enum LanguageChoices { English, French };
 
[DisplayOptions(Header = "Language")]
public LanguageChoices Language { get; set; }
0
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Stefan Nenchev
Telerik team
answered on 17 Jul 2017, 08:25 AM
Hello John,

As my colleague has advised in the ticket you have raised - enumerations are not supported by the default editors. With this in mind, you can use a PickerEditor or a SegmentedEditor in order to edit such properties. Please have a look at the "Editors" example in our SDK Samples Browser where a Segmented editor is used for the "TargetGroup" property of the book object.

Regards,
Stefan Nenchev
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John
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Stefan Nenchev
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