How to convert RadioButtion values to integers

RogerSchlueter-7899 1,256 Reputation points
2021-06-08T08:23:28.853+00:00

I have two RadioButtons on a wpf window that the user can use to indicate whether a transaction is of type credit or debit. The DataContext of the window is a transaction with an integer property TypeID. I am trying to bind the RadioButtons to this property using a converter in XAML. Here's the relevant portion of my XAML: 

<StackPanel  
    Orientation="Horizontal">  
    <RadioButton Content="Credit"  
    	IsChecked="{Binding Path=TypeID, Converter={StaticResource conBooleanToInt}}" />  
    <RadioButton  
    	Content="Debit"  
    	IsChecked="{Binding Path=TypeID, Converter={StaticResource conBooleanToInt}}"  
    	Margin="15,0,0,0">  
    </RadioButton>  
</StackPanel>

and here is the BooleanToInt converter: 

Public Class BooleanToInt  
	Implements IValueConverter  
  
	Public Function Convert(value As Object, targetType As Type, parameter As Object, culture As CultureInfo) As Object Implements IValueConverter.Convert  
		Dim x As Boolean = CBool(value)  
		Console.WriteLine($"Convert {x}")  
		Return If(x, 5, 209)  
	End Function  
  
	Public Function ConvertBack(value As Object, targetType As Type, parameter As Object, culture As CultureInfo) As Object Implements IValueConverter.ConvertBack  
		Dim x As Boolean = CBool(value)  
		Console.WriteLine($"Back {x}")  
		Return If(x, 5, 209)  
	End Function  
End Class

When the window is loaded here is what it looks like:

103363-radiobutton.png

and here is the output of the Console statements: 

Convert False  
Convert False  
Back False  
Convert True  
Convert True

Obviously, this is not working:

  • Why is the converter called five times, yielding different results
  • Why do both RadioButtons have IsClicked = True (which should not be possible)

and the ultimate question:

  • How to do this?
XAML
XAML
A language based on Extensible Markup Language (XML) that enables developers to specify a hierarchy of objects with a set of properties and logic.
789 questions
Accepted answer
  1. DaisyTian-1203 11,621 Reputation points
    2021-06-09T07:19:44.31+00:00

    I make a sample based on my understanding, please check if it meets your needs, if it doesn't, let me know:
    XAML code is: 

       <Window.Resources>  
        <local:BooleanToInt x:Key="conBooleanToInt" />  
    </Window.Resources>  
    <StackPanel Orientation="Horizontal">  
        <Label Name="lb" Width="40" Height="30" Content="{Binding TypeID,UpdateSourceTrigger=PropertyChanged,Mode=TwoWay}" Background="Azure" VerticalAlignment="Top" ></Label>  
        <RadioButton Content="Credit" IsChecked="True" ></RadioButton>  
        <RadioButton Content="Debit" IsChecked="{Binding Path=TypeID, Converter={StaticResource conBooleanToInt},UpdateSourceTrigger=PropertyChanged,Mode=TwoWay}" Margin="30 0 0 0"/>  
    </StackPanel>

    vb code is: 

    Imports System.ComponentModel  
  
Partial Public Class MainWindow  
    Inherits Window  
  
    Private Property model As Model = New Model()  
  
    Public Sub New()  
        InitializeComponent()  
        model.TypeID = 5  
        Me.DataContext = model  
    End Sub  
End Class  
  
Public Class Model  
    Implements INotifyPropertyChanged  
  
    Public _typeID As Integer  
  
    Public Property TypeID As Integer  
        Get  
            Return _typeID  
        End Get  
        Set(ByVal value As Integer)  
            _typeID = value  
            OnPropertyChanged("TypeID")  
        End Set  
    End Property  
  
    Private Event PropertyChanged As PropertyChangedEventHandler Implements INotifyPropertyChanged.PropertyChanged  
  
    Protected Sub OnPropertyChanged(ByVal proName As String)  
        RaiseEvent PropertyChanged(Me, New PropertyChangedEventArgs(proName))  
    End Sub  
End Class  
  
  
  
Public Class BooleanToInt  
Implements IValueConverter  
  
    Public Function Convert(value As Object, targetType As Type, parameter As Object, culture As Globalization.CultureInfo) As Object Implements IValueConverter.Convert  
        Dim x As Integer = Integer.Parse(value.ToString())  
  
        If x = 5 Then  
            Return True  
        Else  
            Return False  
        End If  
    End Function  
  
  
    Public Function ConvertBack(value As Object, targetType As Type, parameter As Object, culture As Globalization.CultureInfo) As Object Implements IValueConverter.ConvertBack  
        Dim x As Boolean = System.Convert.ToBoolean(value)  
  
        If x = False Then  
            Return 209  
        Else  
            Return 5  
        End If  
    End Function  
End Class

    Result picture is:
    103781-3.gif

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