Binding RadioButtons with Gender Property in WPF Using Value Converter

Many WPF developers face a common problem when working with RadioButtons . They try to bind RadioButtons with a Gender property, but the binding does not work as expected . Why does this happen? Because RadioButtons work with true/false values , but in real applications, Gender is stored as meaningful values like: Male Female So the big question is: How do we connect a true/false UI control with a Male/Female data value? Why RadioButton Binding Fails A RadioButton uses the IsChecked property, and this property accepts only: true false But your Gender property is usually: a string ( "Male" , "Female" ) or an enum So the UI value and the data value are different types . This mismatch is the root cause of the problem. The Solution: Value Converter WPF provides a powerful feature called a Value Converter . What is a Value Converter? A Value Converter converts one value type into another. In our case: Convert Gender (...

How to Enable/Disable Button on Validation using DelegateCommand of Prism


 MainWindow.xaml

 <Window x:Class="Wpf.Views.MainWindow"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             xmlns:local="clr-namespace:Wpf"
             mc:Ignorable="d">
     <Window.Resources>
         <ControlTemplate  x:Key="TextBoxErrorStyle">
             <StackPanel Orientation="Horizontal">
                 <AdornedElementPlaceholder x:Name="ErrorHolder" >
                     <Border BorderBrush="red" BorderThickness="1" />
                 </AdornedElementPlaceholder>
                 <TextBlock  Text="{Binding [0].ErrorContent}" VerticalAlignment="Center" HorizontalAlignment="Right" Foreground="Red"/>

             </StackPanel>
         </ControlTemplate>

     </Window.Resources>
     <StackPanel Orientation="Vertical" HorizontalAlignment="Left" >
         <TextBox Height="30" Width="200" Text="{Binding Text,Mode=TwoWay,NotifyOnValidationError=True,
                  ValidatesOnDataErrors=True,UpdateSourceTrigger=PropertyChanged}"
                  Validation.ErrorTemplate="{StaticResource TextBoxErrorStyle}" Margin="5" />
         <Button Content="Click Here" Command="{Binding ClickCommand}" Margin="10" Width="100"/>
     </StackPanel>
 </Window>


 MainWindow.xaml.cs

 public partial class MainWindow : Window
     {
       
         public MainWindow()
         {
             InitializeComponent();
             DataContext= new MainWindowViewModel();
         
         }
       
     }

MainWindowViewModel.cs


 using Prism.Commands;
 using Prism.Mvvm;

 public class MainWindowViewModel : BindableBase, IDataErrorInfo
     {
         private string _text = string.Empty;

         public string Text
         {
             get
             {
                 return _text;
             }
             set
             {
                 SetProperty(ref _text, value);
                 ClickCommand.RaiseCanExecuteChanged();

             }
         }
       
         public string Error => string.Empty;

         public string this[string columnName]
         {
             get
             {

                 if (columnName == "Text")
                 {
                     if (string.IsNullOrEmpty(Text?.Trim()))
                         return "Text should not be empty";
                 }
                 return string.Empty;
             }

         }
       
         private DelegateCommand _clickCommand;
       
         public DelegateCommand ClickCommand
         {
             get
             {
                 return _clickCommand = _clickCommand ?? new DelegateCommand(Click, () => !string.IsNullOrEmpty(_text));
             }

         }
       
         private void Click()
         {
             //code
         }
     }

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