在基类和子类的情况下，我需要定义INotifyPropertyChanged

本文关键字：定义 INotifyPropertyChanged 情况下 基类 子类 | 更新日期: 2023-09-27 18:22:29

我有这个Base class:

public abstract class WiresharkFile
{
    protected string _fileName;
    protected int _packets;
    protected int _packetsSent;
    protected string _duration;
    public int Packets
    {
        get { return _packets; }
        set { _packets = value; }
    }
    public int PacketsSent
    {
        get { return _packetsSent; }
        set { _packetsSent = value; }
    }
}

这个子类：

public class Libpcap : WiresharkFile, IDisposable, IEnumerable<WiresharkFilePacket>
{
    ....
}

创建我的对象：

WiresharkFile wiresahrkFile = new Libpcap(file);

我的收藏：

public ObservableCollection<WiresharkFile> wiresharkFiles { get; set; }

发送数据包：

wiresahrkFile.Sendpackets();

此时，我所有的wiresahrkFile（Libpcap类型）属性都在更改，所以我想知道在哪里需要定义这个INotifyPropertyChanged。

在基类和子类的情况下，我需要定义INotifyPropertyChanged

如果您的xaml绑定到WiresharkFile的属性，那么WiresharkFile必须实现INotifyPropertyChanged，否则将导致内存泄漏（WPF编程的三大内存泄漏陷阱）。如果绑定仅在Libpcap类上定义，那么Libpcap必须实现INotifyPropertyChanged接口。在我的项目中，我创建了INotifyPropertyChanged接口的基本实现，然后每个基本模型和基本视图模型都继承自该实现。以下是一些基本代码：1.基础实施：

public class BaseObservableObject : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;
    protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
    {
        var handler = PropertyChanged;
        if (handler != null) handler(this, new PropertyChangedEventArgs(propertyName));
    }
    protected virtual void OnPropertyChanged<T>(Expression<Func<T>> raiser)
    {
        var propName = ((MemberExpression)raiser.Body).Member.Name;
        OnPropertyChanged(propName);
    }
    protected bool Set<T>(ref T field, T value, [CallerMemberName] string name = null)
    {
        if (!EqualityComparer<T>.Default.Equals(field, value))
        {
            field = value;
            OnPropertyChanged(name);
            return true;
        }
        return false;
    }
}

2.你的型号（在我看来）：

public abstract class WiresharkFile:BaseObservableObject
{
    private string _fileName;
    private int _packets;
    private int _packetsSent;
    private string _duration;
    public int Packets
    {
        get { return _packets; }
        set
        {
            _packets = value;
            OnPropertyChanged();
        }
    }
    public int PacketsSent
    {
        get { return _packetsSent; }
        set
        {
            _packetsSent = value;
            OnPropertyChanged();
        }
    }
}

问候，

与IIan的答案相同，但适用于C#8和.Net Framework 4.8。

1.基本模型

public class ObservableObject : INotifyPropertyChanged
{
        public event PropertyChangedEventHandler PropertyChanged;
        protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }
        protected virtual void OnPropertyChanged<T>(Expression<Func<T>> raiser)
        {
            string propName = ((MemberExpression)raiser?.Body).Member.Name;
            OnPropertyChanged(propName);
        }
        protected bool Set<T>(ref T field, T value, [CallerMemberName] string name = null)
        {
            if (!EqualityComparer<T>.Default.Equals(field, value))
            {
                field = value;
                OnPropertyChanged(name);
                return true;
            }
            return false;
        }
}

2.您的型号

public class Current : ObservableObject
{
        private string _status;
        public Current()
        {
            Status = "Not Connected";
        }
        public string Status
        {
            get { return _status; }
            set
            {
                _status = value;
                OnPropertyChanged(); // call this to update
            }
        }
}

3.如何使用

<Label Content="{Binding Status}"/>
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