未选择任何选项时的 RadioButton ValidationRule

Question

我正在尝试弄清楚如何为 radiobutton 创建验证规则。我想要实现的是用户必须通过单选按钮 select 一个选项。

我的 ViewModel 有一个基于 Enum 的属性:

public enum Gender
{
    Unknown,
    Male,
    Female
}

[ImplementPropertyChanged]
public class MyViewModel
{
    public Gender Gender { get; set; }

    public MyViewModel()
    {
        Gender = Gender.Unknown;
    }
}

<StackPanel Orientation="Horizontal">
    <RadioButton Content="Male" IsChecked="{Binding Gender, ConverterParameter={x:Static data:Gender.Male}, Converter={StaticResource EnumToBooleanConverter}}"/>
    <RadioButton Content="Female" IsChecked="{Binding Gender, ConverterParameter={x:Static data:Gender.Female}, Converter={StaticResource EnumToBooleanConverter}}"/>
</StackPanel>

我有 'error' 复选框样式（红色边框、字体颜色等）

当 Gender 仍设置为 Unknown 时，我应该如何实现为每个单选按钮触发 ValidationRule？（所以都显示我的错误风格）

Answer 1

我已经开始工作了，不是 ValidationRule，而是 IDataErrorInfo。

[ImplementPropertyChanged]
public class MyViewModel : IDataErrorInfo
{
    public Gender Gender { get; set; }

    public MyViewModel()
    {
        Gender = Gender.Unknown;
    }

    public string this[string name]
    {
        get
        {
            if (name == "Gender" && Gender == Gender.Unknown)
            {
                return "Gender need to be known";
            }
            return null;
        }
    }

    public string Error
    {
        get
        {
            return null;
        }
    }
}

<StackPanel Orientation="Horizontal">
    <RadioButton Content="Male" IsChecked="{Binding Gender, ConverterParameter={x:Static data:Gender.Male}, Converter={StaticResource EnumToBooleanConverter}, NotifyOnSourceUpdated=True, ValidatesOnDataErrors=True}"/>
    <RadioButton Content="Female" IsChecked="{Binding Gender, ConverterParameter={x:Static data:Gender.Female}, Converter={StaticResource EnumToBooleanConverter}, NotifyOnSourceUpdated=True, ValidatesOnDataErrors=True}"/>
</StackPanel>

总结：

在代码中实现IDataErrorInfo
在xaml中添加NotifyOnSourceUpdated=True, ValidatesOnDataErrors=True到RadioButtons

未选择任何选项时的 RadioButton ValidationRule

RadioButton ValidationRule when no option is selected

c#

validation

wpf

radio-button