WPF + MVVM + RadioButton:使用单一属性处理绑定 [英] WPF + MVVM + RadioButton : Handle binding with single property

问题描述

来自本和this(和其他)关于 SO 和互联网上许多其他材料的问题，我了解如何将单选按钮与 VM 绑定.

From this and this (and other) questions on SO and many other material on internet, I understood how to bind radio button with VM.

但是它们都为单选按钮的每个可能值创建了单独的属性.一个问题(this)与我的要求相似，但已接受的答案建议使用 ListBox 而不是单选按钮.

But all of them create separate property for each possible value of radio button. One question (this) is similar to my requirement but the accepted answer suggests to use ListBox instead of radio button.

为了表示人的性别(数据类型CHAR，可能的值'M'、'F')，需要在VM中创建三个属性，分别是PersonGender、IsPersonMale、IsPersonFemale.我只想在一个属性 PersonGender 上控制它.我可以这样做吗?如果是，如何?

To represent person gender (Datatype CHAR, Possible values 'M', 'F'), three properties needs to be created in VM as PersonGender, IsPersonMale, IsPersonFemale. I want to control this on only one property PersonGender. Can I do this? If yes, how?

推荐答案

您需要一个转换器.

//define this in the Window's Resources section or something similiarly suitable
<local:GenderConverter x:Key="genderConverterKey" />


<RadioButton Content="M" IsChecked="{Binding Gender, Converter={StaticResource ResourceKey=genderConverterKey}, ConverterParameter=M}" />
<RadioButton Content="F" IsChecked="{Binding Gender, Converter={StaticResource ResourceKey=genderConverterKey}, ConverterParameter=F}" />

转换器

public class GenderConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        return ((string)parameter == (string)value);
    }

    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        return (bool)value ? parameter : null;        
    }
}

如果在这种情况下不应应用绑定，请将 null(在 ConvertBack 中)替换为 Binding.DoNothing.

Replace null (in ConvertBack) with Binding.DoNothing if binding should not be applied in that case.

return (bool)value ? parameter : Binding.DoNothing;

这篇关于WPF + MVVM + RadioButton:使用单一属性处理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！