【WPF】七、通知更改INotifyPropertyChanged

首先要继承INotifyPropertyChanged

简单方式在赋值的时候调用PropertyChanged

namespace WpfApp1
{
    public class MainViewModel:INotifyPropertyChanged
    {
        public MyCommand ShowCommand { get; set; }

        public event PropertyChangedEventHandler PropertyChanged;

        public string Name
        {
            get { return name; }
            set { name = value;
                //通知客户端内容更改的方式一种
                PropertyChanged?.Invoke(this, new PropertyChangedEventArgs("Name")); 
                    }
        }

        public string name;

        public MainViewModel()
        {
            Name = "Hello World";
            ShowCommand = new MyCommand(Show);
        }


        public void Show()
        {
            Name = "点击了Button";
            MessageBox.Show(Name);

        }
    }
}

方式二：自动绑定

封装一个事件调用OnPropertyChanged

 
namespace WpfApp1
{
    public class MainViewModel:INotifyPropertyChanged
    {
        public MyCommand ShowCommand { get; set; }

        public event PropertyChangedEventHandler PropertyChanged;

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

        public string Name
        {
            get { return name; }
            set { name = value;
                //通知客户端内容更改的方式一种
                OnPropertyChanged();
                    }
        }

        public string name;
          
        public MainViewModel()
        {
            Name = "Hello World";
            ShowCommand = new MyCommand(Show);
        }


        public void Show()
        {
            Name = "点击了Button";
            MessageBox.Show(Name);

        }
    }
}