WPF + MVVM + RadioButton:具有单个属性的句柄绑定 [英] WPF + MVVM + RadioButton : Handle binding with single property

问题描述

来自 this 和

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

但是它们全部为单选按钮的每个可能值创建了单独的属性.一个问题(此)与我的要求类似，但已被接受建议使用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.

要代表人的性别(数据类型CHAR，可能的值"M"，"F")，需要在VM中创建三个属性，分别为PersonGender，IsPersonMale和IsPersonFemale. 我只想对一个属性PersonGender进行控制. 我可以这样做吗?如果是，怎么办?

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该应用绑定，请用Binding.DoNothing替换null(在ConvertBack中).

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:具有单个属性的句柄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！