c# - 将单选按钮绑定(bind)到枚举属性

Question

我想我已经遵循了 post 中给出的示例但是当按钮改变时我的属性没有改变。关于我哪里出错的任何建议？

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) ? 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>

Answer 1

需要设置Binding Mode为TwoWay，然后在Converter中实现方法ConvertBack负责将bool转换为SystemTypes，在SystemType的settter中包含

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

为了填充其值已更改的属性。

OnPropertyChanged(() => "SystemType")

如果你实现接口(interface) INotifyPropertyChanged 就可以工作。我不知道你是否设置了 DataContext，如果你没有绑定(bind)就不起作用。为了在 InitializeComponent() 添加之后纠正这个问题

this.DataContext = this;