使用元数据获取对调用某个方法的类的引用

Question

当使用INotifyPropertyChanged时，可以这样做以获取调用事件的方法所在的属性的名称。

 public void RaisePropertyChanged([CallerMemberName] string prop = "")
    {
        if (PropertyChanged != null)
        {
            PropertyChanged(new object(), new PropertyChangedEventArgs(prop));
        }
    }

是否有其他类型的属性可以用来获取对包含该属性的类的引用?我希望能够从任何视图模型类的任何属性中调用RaisePropertyChanged()。我所有的视图模型类都是从基类派生的，所以我认为我可以这样做。

 public void RaisePropertyChanged([CallerMemberName] string prop = "", [CallerClassRef] VmBase base = null)
    {
        if (PropertyChanged != null)
        {
            PropertyChanged(base, new PropertyChangedEventArgs(prop));
        }
    }

Answer 1

访问当前类引用的关键字称为this:

public void RaisePropertyChanged([CallerMemberName] string prop = "")
{
    if (PropertyChanged != null)
    {
        PropertyChanged(this, new PropertyChangedEventArgs(prop));
    }
}

无论你派生多少次这个类，this总是这个函数被调用的实例。

Answer 2

尝试使用Fody - PropertyChanged add in。它帮助你注入INotifyPropertyChanged实现到IL代码。

源代码:

[ImplementPropertyChanged]
public class Person 
{        
    public string GivenNames { get; set; }
    public string FamilyName { get; set; }
    public string FullName
    {
        get
        {
            return string.Format("{0} {1}", GivenNames, FamilyName);
        }
    }
}

编译时

public class Person : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;
    string givenNames;
    public string GivenNames
    {
        get { return givenNames; }
        set
        {
            if (value != givenNames)
            {
                givenNames = value;
                OnPropertyChanged("GivenNames");
                OnPropertyChanged("FullName");
            }
        }
    }
    string familyName;
    public string FamilyName
    {
        get { return familyName; }
        set 
        {
            if (value != familyName)
            {
                familyName = value;
                OnPropertyChanged("FamilyName");
                OnPropertyChanged("FullName");
            }
        }
    }
    public string FullName
    {
        get
        {
            return string.Format("{0} {1}", GivenNames, FamilyName);
        }
    }
    public virtual void OnPropertyChanged(string propertyName)
    {
        var propertyChanged = PropertyChanged;
        if (propertyChanged != null)
        {
            propertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }
    }
}

源代码复制自:https://github.com/Fody/PropertyChanged