BindableBase与INotifyChanged

Question

有谁知道BindableBase是否仍然可行还是我们应该坚持使用INotifyChanged事件？好像BindableBase很快就失去了光彩.感谢您提供的任何信息.

Answer 1

INotifyPropertyChanged的

ViewModel应该实现INotifyPropertyChanged接口,并且应该在属性更改时引发它

public class MyViewModel : INotifyPropertyChanged
{
    private string _firstName;


    public event PropertyChangedEventHandler PropertyChanged;

    public string FirstName
    {
        get { return _firstName; }
        set
        {
            if (_firstName == value)
                return;

            _firstName = value;
            PropertyChanged(this, new PropertyChangedEventArgs("FirstName"));
        }
    }


    }
}

问题在于ICommand接口,因为大多数代码都是重复的,因为它传递字符串变得容易出错.

而Bindablebase是一个实现INotifyPropertyChanged接口并提供的抽象类SetProperty<T>.您可以将set方法减少到只有一行,ref参数允许您更新其值.下面的BindableBase代码来自INotifyPropertyChanged,.NET 4.5 Way - Revisited

   public class MyViewModel : BindableBase
{
    private string _firstName;
    private string _lastName;

    public string FirstName
    {
        get { return _firstName; }
        set { SetProperty(ref _firstName, value); }
    }


}

     //Inside Bindable Base
    public abstract class BindableBase : INotifyPropertyChanged
    {

       public event PropertyChangedEventHandler PropertyChanged;

       protected bool SetProperty<T>(ref T storage, T value, [CallerMemberName] String propertyName = null)
       {
          if (Equals(storage, value))
          {
             return false;
          }

          storage = value;
          this.OnPropertyChanged(propertyName);
          return true;
       }

    protected void OnPropertyChanged([CallerMemberName] string propertyName = null)
    {
      PropertyChangedEventHandler eventHandler = this.PropertyChanged;
      if (eventHandler != null)
      {
          eventHandler(this, new PropertyChangedEventArgs(propertyName));
      }
    }
}

Answer 2

它不是这两者之间的选择.

BindableBase实现了INotifyPropertyChanged.

因此,如果您使用BindableBase,您将使用INotifyPropertyChanged.

使用DataBinding实现MVVM时,或多或少强制使用INotifyPropertyChanged.

是否使用BindableBase或其他实现取决于Prism的偏好和使用.