如何实现INotifyPropertyChanged在C＃6.0？ [英] How to implement INotifyPropertyChanged in C# 6.0?

问题描述

此问题的答案已经编辑说在C＃6.0，INotifyPropertyChanged可以用下面的OnPropertyChanged过程实现：

The answer to this question has been edited to say that in C# 6.0, INotifyPropertyChanged can be implemented with the following OnPropertyChanged procedure:

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

然而，从该答案不清楚相应的属性定义应该是。

However, it isn't clear from that answer what the corresponding property definition should be. What does a complete implementation of INotifyPropertyChanged look like in C# 6.0 when this construction is used?

推荐答案

在合并各种更改后，在C＃6.0中，完整的INotifyPropertyChanged实现是什么样子？代码看起来像这样。

After incorporating the various changes, the code will look like this. I've highlighted with comments the parts that changed and how each one helps

public class Data : INotifyPropertyChanged
{ 
    public event PropertyChangedEventHandler PropertyChanged;
    protected void OnPropertyChanged([CallerMemberName] string propertyName = null)
    {
        //C# 6 null-safe operator. No need to check for event listeners
        //If there are no listeners, this will be a noop
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }

    // C# 5 - CallMemberName means we don't need to pass the property's name
    protected bool SetField<T>(ref T field, T value,
    [CallerMemberName] string propertyName = null)
    {
        if (EqualityComparer<T>.Default.Equals(field, value)) 
            return false;
        field = value;
        OnPropertyChanged(propertyName);
        return true;
    }

    private string name;
    public string Name
    {
        get { return name; }
        //C# 5 no need to pass the property name anymore
        set { SetField(ref name, value); }
    }
}

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