C# 自定义事件
C# 自定义事件
class Program
{ static void Main(string[] args)
{
Person person = new Person();
person.Height = 165;
person.HeightChanged += Person_HeightChanged;
person.Height++;
Console.ReadKey();
} private static void Person_HeightChanged(object sender, PropertyChanged<int> e)
{
Console.WriteLine("旧的身高为" + e.LastProperty + "新的身高为" + e.NewProperty);
} public class PropertyChanged<T> : EventArgs
{ public readonly T LastProperty; public readonly T NewProperty; public PropertyChanged(T last, T newProperty)
{
LastProperty = last;
NewProperty = newProperty;
}
} public class Person
{ private int height; public int Height
{ get { return height; } set
{ var old = height; var newHeight = value;
height = value;
OnHeightChanged(new PropertyChanged<int>(old, newHeight));
}
} public event EventHandler<PropertyChanged<int>> HeightChanged; protected virtual void OnHeightChanged(PropertyChanged<int> e)
{ if (HeightChanged != null)
{
HeightChanged.Invoke(this, e);
}
}
}
来源https://www.cnblogs.com/niaofei123/p/15072868.html