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Wilmilcard
Asked: 2020-10-04 14:51:39 +0800 CST 2020-10-04 14:51:39 +0800 CST

Do an IsSelected on a ComboBox with the SelectedValue [UWP]

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I have a ComboBox, which already has some items assigned, loaded by means of an enumeration (Enum):

public enum TERCERO_TIPOID : byte {
        [Display(Name = "Nit")]NIT,
        [Display(Name = "Cedula Cuidadania")]CC,
        [Display(Name = "Cedula Extranjeria")]CE,
        [Display(Name = "Pasaporte")]PASAPORTE,
        [Display(Name = "Tarjeta Extranjeria")]TAR_EXT,
        [Display(Name = "Doc. Id Extranjeria")]DOCID_EXT,
        [Display(Name = "Tarjeta Identidad")]TAR_IDEN,
        [Display(Name = "Nuip")]NUIP,
        [Display(Name = "Codigo")]COD,
        [Display(Name = "Otros")]OTRO = 9 }

In the comboBox it already shows me the DataAnotation of the name, so far so good, but in the database when I query the People table there is a field called "TipoDoc" which by requirements is a bit field, therefore when loading TipoDoc brings me a number from 1 to 9 no more, but I need the comboBox to load the type of document it has when loading a user.

If I do it, for example with a Combo_Tipo.SelectedIndex = 3;the comboBox will select the third in the "Passport" enumeration, but I need the ComboBox to be selected with the value, instead of using the SelectedIndex use the SelectedValue. That when giving it, for example Combo_Tipo.SelectedValue = "Nit";, I leave the type of NIT document selected.

But when I do it, he doesn't let me do it. How do I do it? What am I doing wrong?

The SelectedIndex captures me and assigns me the value in the combo.

The SelectedValue only captures the Combo data but does not assign it to me when I need it.

Combo:

<ComboBox Header="Tipo Documento:" Width="150" HorizontalAlignment="Center" VerticalAlignment="Top" x:Name="Combo_TipoDoc" SelectedItem="{Binding Tipoid, Mode=TwoWay}" />

and this is the Object in the field in the VM:

public TERCERO_TIPOID Tipoid { get => tipoid; set { tipoid = value; RaisePropertyChanged(); } }
private TERCERO_TIPOID tipoid;

and so I load it in the codeBehind of the XAML window, that isTerceroPage.xaml.cs

this.Combo_TipoDoc.ItemsSource = Enum.GetValues(typeof(TERCERO_TIPOID)).Cast<TERCERO_TIPOID>();
xaml

1 Answers

  1. Best Answer

    As you indicate in your comment, what you need is to cast from intto Enumand vice versa, here is an example:

     public enum TERCERO_TIPOID : byte
    {
        [Display(Name = "Nit")]
        NIT,//0
        [Display(Name = "Cedula Cuidadania")]
        CC,//1
        [Display(Name = "Cedula Extranjeria")]
        CE,//2
        [Display(Name = "Pasaporte")]
        PASAPORTE,//3
        [Display(Name = "Tarjeta Extranjeria")]
        TAR_EXT,//4
        [Display(Name = "Doc. Id Extranjeria")]
        DOCID_EXT,//5
        [Display(Name = "Tarjeta Identidad")]
        TAR_IDEN,//6
        [Display(Name = "Nuip")]
        NUIP,//7
        [Display(Name = "Codigo")]
        COD,//8
        [Display(Name = "Otros")]
        OTRO = 9
    }

    since the datasource that you indicate in your question is a collection of the enums of TERCERO_TIPOID:

    Combo_TipoDoc.ItemsSource = Enum.GetValues(typeof(TERCERO_TIPOID)).Cast<TERCERO_TIPOID>();

    Since you want to get the value enteroo bytefrom your enum you can do it this way by getting it from the SelectedItem:

    var  document = (TERCERO_TIPOID)Combo_TipoDoc.SelectedItem;
int idDocumento = (int)document;

    And to convert from enteroto Enum:

    var valorEntero=3;
TERCERO_TIPOID dipoDoc = (TERCERO_TIPOID)valorEntero;
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