在特定对象上引发PropertyChanged事件 [英] Raise PropertyChanged event on a specific object

问题描述

因此，我有一个处理某些应用程序数据的类(称为DataClass).该类实现了 INotifyPropertyChanged 接口.目前，我在ViewModelBase类中创建了2个此类的静态实例(DataRx和DataTx)，我想分别在每个类上引发 PropertyChanged 事件.在ViewModel上，实现为:

So i have a class (called DataClass) that handles some application data. The class implemented the INotifyPropertyChanged interface. Currently i have 2 static instances of this class (DataRx and DataTx) that i created in the ViewModelBase class and I want to raise the PropertyChanged events on each class separately. On the ViewModel the implementation is:

DataRx.PropertyChanged += DataRx_PropertyChanged;
DataTx.PropertyChanged += DataTx_PropertyChanged;

问题在于，当我更改DataRx对象的任何DataClass属性时， DataRx_PropertyChanged 和 DataTx_PropertyChanged 方法均被激活，而不仅仅是 DataRx_PropertyChanged .

The issue is that while I'm changing any of the DataClass properties of DataRx object both DataRx_PropertyChanged and DataTx_PropertyChanged methods are activated instead of just DataRx_PropertyChanged.

如何仅在所需对象上激活事件?

How can I activate the event just on the desired object?

接口实现如下:

public event PropertyChangedEventHandler PropertyChanged;
protected bool SetProperty<T>(ref T field, T value, [CallerMemberName]string name = null)
{
    if (Equals(field, value))
    {
        return false;
    }
    field = value;
    OnPropertyChanged(name);
    return true;
 }  
 protected void OnPropertyChanged([CallerMemberName]string name = null)
 {
    PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(name));
 }

推荐答案

您可能是在声明PropertyChangedEventHandler静态的.

You're probably declaring the PropertyChangedEventHandler static.

INotifyPropertyChanged接口的正确实现应类似于以下内容:

The correct implementation of the INotifyPropertyChanged interface should look similar to this:

private string myProperty;

public event PropertyChangedEventHandler PropertyChanged;

// This method is called by the Set accessor of each property.
// The CallerMemberName attribute that is applied to the optional propertyName
// parameter causes the property name of the caller to be substituted as an argument.
private void NotifyPropertyChanged([CallerMemberName] String propertyName = "")
{
    PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}

public string MyProperty
{
    get
    {
        return myProperty;
    }
    set
    {
        if (myProperty != value)
        {
            myProperty = value;
            NotifyPropertyChanged();
        }
    }
}

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