事件

当某个值发生变化时，将触发事件；

 

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using System; using System.ComponentModel;   namespace ConsoleApp1 {     class Program     {         static void Main(string[] args)         {             //TestClassCSharp6 test = new TestClassCSharp6();             //Console.WriteLine(test.Name);               #region 事件             NotfifyPropertyChanged notfifyPropertyChanged = new NotfifyPropertyChanged();               notfifyPropertyChanged.PropertyChanged += NotfifyPropertyChanged_PropertyChanged;               notfifyPropertyChanged.LastName = "SHa.Jazy";             notfifyPropertyChanged.LastName = "SHa.Jazyfdasf";               #endregion           }           private static void NotfifyPropertyChanged_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)         {             Console.WriteLine($"值发生了变化！");         }     }         public class NotfifyPropertyChanged : INotifyPropertyChanged     {         public event PropertyChangedEventHandler PropertyChanged;           private string lastName;           public string LastName         {             get => lastName;             set             {                 if (value != lastName)                 {                     lastName = value;                     PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(LastName)));                 }             }         }     } }