获取选定的单选按钮组（WPF） [英] Get Selected Radio Button in a Group (WPF)

问题描述

我有一个的ItemsControl 在我的计划，包含单选按钮的列表。

I have a ItemsControl in my program that contains a list of radio buttons.

<ItemsControl ItemsSource="{Binding Insertions}">
        <ItemsControl.ItemTemplate>
            <DataTemplate>
                <Grid>
                    <RadioButton GroupName="Insertions"/>
                </Grid>
            </DataTemplate>
        </ItemsControl.ItemTemplate>
    </ItemsControl>

我要如何找到一个MVVM方式在组 的插入在选定的单选按钮？

How do I find the selected radio button in the group Insertions in a MVVM manner?

大多数我已经在互联网上找到的例子包括设置你的器isChecked 属性绑定到一个转换器的帮助下单独布尔属性。

Most of the examples I have found on the internet involve setting individual boolean properties that you bind the IsChecked property to with the help of a converter.

有没有在列表框的等效 的SelectedItem 我可以绑定到？

Is there an equivalent of the ListBox SelectedItem that I can bind to?

推荐答案

这所想到的一个解决方案是一个器isChecked 布尔属性添加到您插入的实体和绑定的在单选按钮的`器isChecked的财产。这样你就可以在视图模型检查经过单选按钮。

One solution that comes to mind is to add an IsChecked boolean property to your Insertion entities and bind that to the `IsChecked' property of the Radio button. This way you can check the 'Checked' radio button in View Model.

下面是一个快速和肮脏的例子。

Here is a quick and dirty example.

注：我忽略了一个事实，即器isChecked也可以是空，你可以处理，使用布尔？ 如果需要的话。

NB: I ignored the fact that the IsChecked can also be null, you could handle that using bool? if required.

简单视图模型

using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;

namespace WpfRadioButtonListControlTest
{
  class MainViewModel
  {
    public ObservableCollection<Insertion> Insertions { get; set; }

    public MainViewModel()
    {
      Insertions = new ObservableCollection<Insertion>();
      Insertions.Add(new Insertion() { Text = "Item 1" });
      Insertions.Add(new Insertion() { Text = "Item 2", IsChecked=true });
      Insertions.Add(new Insertion() { Text = "Item 3" });
      Insertions.Add(new Insertion() { Text = "Item 4" });
    }
  }

  class Insertion
  {
    public string Text { get; set; }
    public bool IsChecked { get; set; }
  }
}

该XAML - 在code后面不显示，因为它具有比大于产生code等没有code

The XAML - The code behind is not shown since it has no code other than than the generated code.

<Window x:Class="WpfRadioButtonListControlTest.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="clr-namespace:WpfRadioButtonListControlTest"
        Title="MainWindow" Height="350" Width="525">
  <Window.Resources>
    <local:MainViewModel x:Key="ViewModel" />
  </Window.Resources>
  <Grid DataContext="{StaticResource ViewModel}">
    <ItemsControl ItemsSource="{Binding Insertions}">
      <ItemsControl.ItemTemplate>
        <DataTemplate>
          <Grid>
            <RadioButton GroupName="Insertions" 
                         Content="{Binding Text}" 
                         IsChecked="{Binding IsChecked, Mode=TwoWay}"/>
          </Grid>
        </DataTemplate>
      </ItemsControl.ItemTemplate>
    </ItemsControl>
  </Grid>
</Window>

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