Cant bind a property as enum to combobox in wpf mvvm - wpf

Question

I have the following scenario:
Problem : Cant bind a property as enum to combox in wpf mvvm ?
How can I bind this enum to a combobox?
1.I have an enum.
public enum RankType
{
StringValue1,
StringValue2,
StringValue3
}
2.I Have a property as enum in myclass :
[DefaultValue(RankType.StringValue1)]
[ConvertUsing(typeof(EnumTypeConverter<RankType>))]
public RankType Rank { set; get; }
ConvertUsing Class,It does the conversion for me:
[System.AttributeUsage(AttributeTargets.Property | AttributeTargets.Field, AllowMultiple = false)]
public class ConvertUsingAttribute:Attribute
{
private TypeConverter _converter = null;
public TypeConverter Converter
{
get
{
if (_converter == null)
_converter = (TypeConverter)System.Activator.CreateInstance(TypeOfConverter);
return _converter;
}
}
public Type TypeOfConverter
{
get;
private set;
}
public ConvertUsingAttribute(Type converterType)
{
this.TypeOfConverter = converterType;
}
}
EnumTypeConverter Class:
public class EnumTypeConverter<T>:TypeConverter
{
public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType)
{
return sourceType == typeof(string);
}
public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType)
{
return destinationType == typeof(string);
}
public override object ConvertFrom(ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value)
{
if (value != null && value is string)
{
return Enum.Parse(typeof(T), (string)value);// int.Parse(((string)value).Trim());
}
return base.ConvertFrom(context, culture, value);
}
public override object ConvertTo(ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value, Type destinationType)
{
if (value != null && destinationType == typeof(string))
{
return ((T)value).ToString();
}
return base.ConvertTo(context, culture, value, destinationType);
}
}
4.In ViewModel
private MilitaryRankType _selectedRankType;
public RankType SelectedRankType
{
get { return _selectedRankType; }
set
{
_selectedRankType = value;
NotifyPropertyChanged(nameof(RankTypes));
}
}
private RankType[] _rankTypes;
public RankType[] RankTypes
{
get
{
return _rankTypes ??
(_rankTypes =Enum.GetValues(typeof(RankType)).Cast<RankType>().ToArray());
}
}
5.In View
<ComboBox ItemsSource="{Binding RankTypes, UpdateSourceTrigger=PropertyChanged, NotifyOnValidationError=True, ValidatesOnDataErrors=True, ValidatesOnExceptions=True}" SelectedItem="{Binding SelectedRankType}" />
6.I used the listview in xaml
<ListView ItemsSource="{Binding EmployeesList}" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Margin="3">
<ListView.View>
<GridView>
<GridViewColumn Width="150" Header="">
<GridViewColumn.CellTemplate>
<DataTemplate>
<TextBox Text="{Binding Path=NationalId, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged, NotifyOnValidationError=True, ValidatesOnDataErrors=True, ValidatesOnExceptions=True}" />
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
<GridViewColumn Width="150" Header="">
<GridViewColumn.CellTemplate>
<DataTemplate>
<TextBox Text="{Binding Path=CardId, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged, NotifyOnValidationError=True, ValidatesOnDataErrors=True, ValidatesOnExceptions=True}" />
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
<GridViewColumn Width="150" Header="">
<GridViewColumn.CellTemplate>
<DataTemplate>
**<ComboBox SelectedItem="{Binding SelectedRankType}" />**
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
<GridViewColumn Width="150" Header="">
<GridViewColumn.CellTemplate>
<DataTemplate>
<TextBox Text="{Binding Path=FirstName, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged, NotifyOnValidationError=True, ValidatesOnDataErrors=True, ValidatesOnExceptions=True}" />
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
<GridViewColumn Width="150" Header="">
<GridViewColumn.CellTemplate>
<DataTemplate>
<TextBox Text="{Binding Path=LastName,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged,NotifyOnValidationError=True,ValidatesOnDataErrors=True,ValidatesOnExceptions=True}"/>
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
</GridView>
</ListView.View>
</ListView>

Answer 1

Honestly, I don't really know what went wrong in your code, but I can give you a working example without any fancy converter stuff:
Suppose you have the following window-content:
<Grid x:Name="grid1">
<ComboBox ItemsSource="{Binding SelectableRanks}" SelectedItem="{Binding SelectedRank}"/>
</Grid>
And you initialize the datacontext in the window constructor:
public MainWindow()
{
InitializeComponent();
grid1.DataContext = new RankSelectionVM();
}
And this is your viewmodel:
public class RankSelectionVM
{
private RankType _SelectedRank;
public RankType SelectedRank
{
get { return _SelectedRank; }
set { _SelectedRank = value; }
}
private RankType[] _rankTypes;
public RankType[] SelectableRanks
{
get
{
return _rankTypes ??
(_rankTypes = Enum.GetValues(typeof(RankType)).Cast<RankType>().ToArray());
}
}
}
public enum RankType
{
StringValue1,
StringValue2,
StringValue3
}
It doesn't have any INotifyPropertyChanged or any converters attached, but place a breakpoint in the SelectedRank setter - it should break when you select a value. If this code works for you, you have to find what you did differently to get a not-working code in your project. Otherwise you may have some very strange issue that needs special care.