定義數(shù)值屬性基類
public class NotificateionEntity : INotifyPropertyChanged,INotifyPropertyChanging
{
public event PropertyChangedEventHandler PropertyChanged;
public event PropertyChangingEventHandler PropertyChanging;
protected void SetWithNotify<T>(T value, ref T field, [CallerMemberName] string propertyName = "")
{
if (!Equals(field, value))
{
PropertyChanging?.Invoke(this,new PropertyChangingEventArgs(propertyName));
field = value;
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
}
}
繼承通知屬性
public class NotifySample : NotificateionEntity
{
private int _testValue = 0;
public int TestValue
{
get => _testValue;
set => SetWithNotify(value, ref _testValue);
}
}
使用方法
static void Main(string[] args)
{
var sample = new NotifySample();
sample.PropertyChanged += SampleOnPropertyChanged;
while (true)
{
var str = Console.ReadLine();
if (int.TryParse(str, out int val))
{
sample.TestValue = val;
}
else
{
Console.Write("請(qǐng)輸入數(shù)字");
}
}
}
private static void SampleOnPropertyChanged(object sender, PropertyChangedEventArgs e)
{
var sample = (NotifySample) sender;
Console.WriteLine($"屬性{e.PropertyName}發(fā)生改變，新只為{sample.TestValue}");
}
