.NET MAUI转换器在值变更后无响应/不转换问题求助

问题根源和转换器无关，是因为Answer类没有实现INotifyPropertyChanged接口。当IsCorrect属性值修改时，无法向绑定的UI控件发送属性变更通知，导致UI不会自动刷新。

解决步骤：

• 让Answer类实现INotifyPropertyChanged接口，添加属性变更事件和触发通知的通用方法
• 修改需要UI同步的属性（如IsCorrect、IsSelected）的setter逻辑，在值变更时触发通知

修改后的Answer类代码：

using System.ComponentModel;
using System.Runtime.CompilerServices;
using System.ComponentModel.DataAnnotations;

public class Answer : INotifyPropertyChanged
{
    [Key]
    public int AnswerId { get; set; }
    public int QuestionId { get; set; }
    public string Content { get; set; }
    
    private bool _isCorrect;
    public bool IsCorrect
    {
        get => _isCorrect;
        set
        {
            if (_isCorrect != value)
            {
                _isCorrect = value;
                OnPropertyChanged();
            }
        }
    }
    
    public int? Points { get; set; }
    
    [NotMapped]
    private bool _isSelected;
    public bool IsSelected
    {
        get => _isSelected;
        set
        {
            if (_isSelected != value)
            {
                _isSelected = value;
                OnPropertyChanged();
            }
        }
    }

    public event PropertyChangedEventHandler? PropertyChanged;

    protected void OnPropertyChanged([CallerMemberName] string propertyName = null)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }
}

验证说明：

• 转换器本身逻辑没有问题，只要IsCorrect属性变更时能触发PropertyChanged事件，UI就会自动调用转换器更新Label的Text和TextColor
• 确保页面的BindingContext正确指向Answer类的实例

内容的提问来源于stack exchange，提问作者user23526969