wpf 将单选按钮绑定到枚举属性
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Binding radio button to enum property
提问by James R
I think I've followed the examples given in this postbut my property is not changing when button are changed. Any suggestions on where I went wrong?
我想我已经遵循了这篇文章中给出的例子，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？
C# code for enum and class
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
xml
<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>
采纳答案by Maximus
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
您需要将Binding Mode设置为TwoWay，然后在Converter实现方法ConvertBack负责将bool转换为SystemTypes，在SystemType的setter中包括
set { systemType = value; OnPropertyChanged(() => "SystemType");}
in order to fill property in that its value was changed.
为了填充其值已更改的属性。
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
如果您实现接口 INotifyPropertyChanged，则可以工作。我不知道你是否设置了DataContext，如果你没有绑定是不工作的。为了在 InitializeComponent() 添加后纠正此问题
this.DataContext = this;
