绑定单选按钮到枚举属性 [英] Binding radio button to enum property

问题描述

我想我已经遵循了这个发布中给出的示例，但是当按钮被更改时，我的属性没有改变。任何关于我出错的建议？

枚举和类的C＃代码

  public enum SystemTypes 
 {
 TypeA，
 TypeB 
} 
 
 public partial class MainWindow：Window 
 {
 
 public MainWindow（）
 {
 InitializeComponent（）; 
} 
 SystemTypes systemType = SystemTypes.TypeA; 
 public SystemTypes SystemType 
 {
 get {return systemType; } 
 set {systemType = value; 
 
 
 
 public class EnumToBooleanConverter：IValueConverter 
 {
 public object Convert（object value，Type targetType，object parameter，System.Globalization。 CultureInfo culture）
 {
 return value.Equals（parameter）; 
 
 
 public object ConvertBack（object value，Type targetType，object parameter，System.Globalization.CultureInfo culture）
 {
 return value.Equals（true）？参数：Binding.DoNothing; 
} 
} 
  

xaml

 < Canvas> 
< Canvas.Resources> 
< local：EnumToBooleanConverter x：Key =EnumToBooleanConverter/> 
< /Canvas.Resources> 
< RadioButton x：Name =TypeARadioButtonContent =TypeACanvas.Left =10Canvas.Top =10
 IsChecked ={Binding Path = SystemType，Converter = {StaticResource EnumToBooleanConverter}，ConverterParameter = {x：Static local：SystemTypes.TypeA}}/> 
< RadioButton x：Name =TypeBRadioButtonContent =TypeBCanvas.Left =10Canvas.Top =31
 IsChecked ={Binding Path = SystemType，Converter = {StaticResource EnumToBooleanConverter}，ConverterParameter = {x：Static local：SystemTypes.TypeB}}/> 
 
< / Canvas> 
  

解决方案

您需要将绑定模式设置为TwoWay，然后在转换器实现方法ConvertBack负责将bool转换为SystemTypes，SystemType的定义包括

  set {systemType = value; OnPropertyChanged（（）=>SystemType）;} 
  

为了填充属性，价值改变了。

  OnPropertyChanged（（）=>SystemType）
   
 
 
可以工作。我不知道你是否设置了DataContext，如果你没有绑定是不行的。为了纠正这一点，在InitializeComponent（）之后添加
  this.DataContext = this; 
  
 
I think I've followed the examples given in this post but my property is not changing when button are changed.  Any suggestions on where I went wrong?

C# code for enum and class
public enum SystemTypes
{
    TypeA,
    TypeB
}

public partial class MainWindow : Window
{

    public MainWindow()
    {
        InitializeComponent();
    }
    SystemTypes systemType = SystemTypes.TypeA;
    public SystemTypes SystemType 
    {
        get { return systemType; }
        set { systemType = value; }
    }
}

public class EnumToBooleanConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        return value.Equals(parameter);
    }

    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        return value.Equals(true) ? parameter : Binding.DoNothing;
    }
}
xaml
        <Canvas>
            <Canvas.Resources>
                <local:EnumToBooleanConverter x:Key="EnumToBooleanConverter" />
            </Canvas.Resources>
            <RadioButton x:Name="TypeARadioButton" Content="TypeA" Canvas.Left="10" Canvas.Top="10" 
                         IsChecked="{Binding Path=SystemType, Converter={StaticResource EnumToBooleanConverter}, ConverterParameter={x:Static local:SystemTypes.TypeA}}" />
            <RadioButton x:Name="TypeBRadioButton" Content="TypeB" Canvas.Left="10" Canvas.Top="31"
                         IsChecked="{Binding Path=SystemType, Converter={StaticResource EnumToBooleanConverter}, ConverterParameter={x:Static local:SystemTypes.TypeB}}" />

        </Canvas>

解决方案
You need to set Binding Mode to TwoWay, then in Converter implement method ConvertBack responsible for converting bool to SystemTypes, in settter of SystemType include 
set { systemType = value; OnPropertyChanged(() => "SystemType");}
in order to fill property in that its value was changed. 
OnPropertyChanged(() => "SystemType")
can work if you implement interface INotifyPropertyChanged. I cannot you whether you set DataContext, if you did not binding is not working. In order to rectify this after InitializeComponent() add
this.DataContext = this;


                        
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