无法通过绑定禁用条目

您需要确保 带输入的等式 类正确地实现了INotifyPropertyChanged接口,并引发 属性已更改 事件时 InputAnswer 更改,因为这会间接影响 我错了 所有物

以下是如何修改 带输入的等式 类,以确保更改为 InputAnswer 正确地通知UI有关的更新 我错了 属性:

public class EquationWithInput : Equation, INotifyPropertyChanged
{
    private int? inputAnswer;
    public int? InputAnswer
    {
        get { return inputAnswer; }
        set
        {
            if (inputAnswer != value)
            {
                inputAnswer = value;
                OnPropertyChanged(nameof(InputAnswer));
                // Since IsWrong depends on InputAnswer, it needs to notify the change as well.
                OnPropertyChanged(nameof(IsWrong));
            }
        }
    }

    public int CorrectAnswer { get; set; }

    public bool IsWrong => InputAnswer == null || InputAnswer != CorrectAnswer;

    public event PropertyChangedEventHandler PropertyChanged;

    protected virtual void OnPropertyChanged(string propertyName)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }

}

问题是您必须调用 PropertyChanged 事件时 IsWrong 属性已设置,但在您的情况下(即 我错了 属性取决于其他属性),您可以调用 属性已更改 的事件 InputAnswer 属性setter和name参数应该是IsWrong属性的名称,例如

public string InputAnswer
{
  set 
  {
      //other logic 
 
    OnPrepertyChanged(nameof(IsWrong));
  }
  //other logic
}