WPF绑定Radiobutton到enum

2016-08-20 10:39:29来源:http://11225176.blog.51cto.com/11215176/1790700作者:古泥瓦人点击


WPF中经常会需要用到多个Radiobutton选择项,并且需要将选中的选项映射到某个枚举值enum中。

这种情形的解决办法如下:

1) 需要创建一个UserControl,举个例子代码如下:

<UserControl x:Class="ShangfeiXApp.XModeUserControl"

xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"

xmlns:d="http://schemas.microsoft.com/expression/blend/2008"

xmlns:src="clr-namespace:ShangfeiXApp"

mc:Ignorable="d">

<UserControl.Resources>

<src:XDataModeValueConverter x:Key="XmodeConverter"/>

</UserControl.Resources>

<Grid x:Name="LayoutRoot" Background="White" Margin="10">

<Grid.RowDefinitions>

<RowDefinition Height="Auto"/>

<RowDefinition Height="Auto"/>

<RowDefinition Height="Auto"/>

</Grid.RowDefinitions>

<StackPanel Orientation="Horizontal" Grid.Row="1" HorizontalAlignment="Center">

<RadioButton Content="Background" Margin="0 0 10 0" GroupName="Mode" IsChecked="{Binding mode, Mode=TwoWay, ConverterParameter=BACKGROUND_MODE, Converter={StaticResource XmodeConverter}}" />

<RadioButton Content="Full scale" Margin="0 0 10 0" GroupName="Mode" IsChecked="{Binding mode, Mode=TwoWay, ConverterParameter=FULLSCALE_MODE, Converter={StaticResource XmodeConverter}}" />

<RadioButton Content="Normal" Margin="0 0 10 0" GroupName="Mode" IsChecked="{Binding mode, Mode=TwoWay, ConverterParameter=NORMAL_MODE, Converter={StaticResource XmodeConverter}}" />

</StackPanel>

</Grid>

</UserControl>

2)定义枚举和一个携带枚举属性的类,如下:

public enum XDataMode { BACKGROUND_MODE, FULLSCALE_MODE, NORMAL_MODE };

public class XDataModeValue : INotifyPropertyChanged

{

private XDataMode _mode = XDataMode.BACKGROUND_MODE;

public XDataMode mode

{

get { return _mode; }

set

{

if (_mode != value)

{

_mode = value;

NotifyPropertyChanged("mode");

}

}

}

private void NotifyPropertyChanged(string propertyName)

{

if (PropertyChanged != null)

{

PropertyChanged(this, new PropertyChangedEventArgs(propertyName));

}

}

public event PropertyChangedEventHandler PropertyChanged;

}

3)定义bool与该枚举值得转化类:

[ValueConversion(typeof(XDataMode), typeof(Boolean))]

public class XDataModeValueConverter : IValueConverter

{

// bool转Visibility

public object Convert(object value, Type targetType, object parameter, CultureInfo culture)

{

return (value.ToString() == parameter.ToString());

}

public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)

{

return (bool)value ? Enum.Parse(targetType, parameter.ToString(), true) : null;

}

}

4)在mainwindows.cs中或其他代码中类似如下定义一个变量:

public XDataModeValue Xdatamodevalue { get; set; }

5)在MainWindow中实现如下源码,即给定上下文,便于绑定

public MainWindow()

{

InitializeComponent();

...

Loaded += MainPage_Loaded;

}

private void MainPage_Loaded(object sender, RoutedEventArgs e)

{

DataContext = Xdatamodevalue;

}

完毕!


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