WPF 精修篇 数据绑定 更新通知

原文:WPF 精修篇 数据绑定 更新通知

开始更新一点有意思的了

首先 数据绑定  其中之一 Element 绑定

看例子

<Window x:Class="WpfApplication20.MainWindow"





        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"





        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"





        Title="MainWindow" Height="156.383" Width="246.489" x:Name="MWindow">





    <Grid>





        <TextBox HorizontalAlignment="Left" Height="23" Margin="30,48,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="120" Text="{Binding ElementName=MWindow,Path=PresonName}"/>





        <TextBlock HorizontalAlignment="Left" Margin="30,16,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="42" Text="部门："/>





        <Button Content="提交" HorizontalAlignment="Left" Margin="30,85,0,0" VerticalAlignment="Top" Width="75" Click="Button_Click"/>





        <Button Content="重置" HorizontalAlignment="Left" Margin="127,85,0,0" VerticalAlignment="Top" Width="75" Click="Button_Click_1"/>





        <TextBlock HorizontalAlignment="Left" Margin="85,16,0,0" TextWrapping="Wrap"  VerticalAlignment="Top" Text="{Binding ElementName=MWindow,Path=Department}"/>





 





    </Grid>





</Window>

   public partial class MainWindow : Window,INotifyPropertyChanged





    {





        public MainWindow()





        {





            InitializeComponent();





        }





 





        private string department;





 





        public string Department 





        {





            get { return "软件开发"; }





       





        }





        private string presonName;





      





        public string PresonName





        {





            get { return presonName; }





            set { presonName = value;





            OnPropertyChanged("PresonName");





            }





        }





        private void Button_Click(object sender, RoutedEventArgs e)





        {





            MessageBox.Show("Hi," + PresonName);





        }





 





        private void Button_Click_1(object sender, RoutedEventArgs e)





        {





            PresonName = "";





        }





 





        #region INotifyPropertyChanged 成员





 





        public event PropertyChangedEventHandler PropertyChanged;





        public void OnPropertyChanged(string name) 





        {





            if(PropertyChanged!=null){





            PropertyChanged.Invoke(this,new PropertyChangedEventArgs(name));





            }





        }





 





        #endregion





    }

我们在这个例子里有俩个操作

一个是数据绑定

一个是数据通知

绑定 是用Element 指定window 窗体 因为 创建属性以后 window 窗体就有这个属性 通过名字.属性的方式

通知 需要继承 INotifyPropertyChanged

实现接口方法

public event PropertyChangedEventHandler PropertyChanged;

public void OnPropertyChanged(string name) 

        {

            if(PropertyChanged!=null){

            PropertyChanged.Invoke(this,new PropertyChangedEventArgs(name));

            }

        }

在需要通知的属性下面  加上

OnPropertyChanged（“”属性名“”）;

就可以起到通知作用