如何在Silverlight中设置组单选按钮的数据绑定？ [英] How to set up data binding for group radio button in Silverlight?

问题描述

Sliverlight提供带有GroupName的单选按钮，用于对单选按钮进行分组，以及多选项中的一个选项。这就像：

Sliverlight provides radio button with GroupName to group radiobutton together with only one option from mutiple choice. It's like:

<RadioButton GroupName="Option" Content="Option 1"></RadioButton>
<RadioButton GroupName="Option" Content="Option 2"></RadioButton>
<RadioButton GroupName="Option" Content="Option 3"></RadioButton>

然后在VM中，我只有一个属性用于此选项，说是MyChoice

then in VM, I have only one property for this option,say it's MyChoice

public int MyChoice {get; set;}

那么如何在UI和VM之间为这种情况设置数据绑定？

then how to setup data binding for this case between UI and VM?

推荐答案

使用转换器将bools转换为int：

Used a converter to convert bools to an int:

在Xaml，asssuming选项映射到您的MyChoice属性上的1,2,3：

On Xaml, asssuming options map to 1,2,3 on your MyChoice property:

    <RadioButton GroupName="Option" Content="Option 1"
                 IsChecked="{Binding Path=MyChoice, Converter={StaticResource RadioButtonToIntConverter}, 
        ConverterParameter=1}"/>
    <RadioButton GroupName="Option" Content="Option 2"
                 IsChecked="{Binding Path=MyChoice, Converter={StaticResource RadioButtonToIntConverter}, 
        ConverterParameter=2}"/>
    <RadioButton GroupName="Option" Content="Option 3"
                 IsChecked="{Binding Path=MyChoice, Converter={StaticResource RadioButtonToIntConverter}, 
        ConverterParameter=3}"/>

在转换器中，注意到我没有添加任何转换保护：

In the converter, noting that I did not add any cast protection:

public class RadioButtonToIntConverter:IValueConverter 
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        var para = System.Convert.ToInt32(parameter);
        var myChoice = System.Convert.ToInt32(value);
        return para == myChoice;
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        var para = System.Convert.ToInt32(parameter);
        var isChecked = System.Convert.ToBoolean(value);
        return isChecked ? para : Binding.DoNothing;
    }
}

最好在您的ViewModel中实现INotifyPropertyChanged 。

Also you'd better to implement INotifyPropertyChanged in you ViewModel.

这篇关于如何在Silverlight中设置组单选按钮的数据绑定？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！