WPF双向绑定

需求:

思想批量保存数据.

思路:

看了一下MVVM.发现只需要实现前台和后台数据的同步即可.也就是前台的文本框内容变化时后台的对象的属性也要变化就可以了.

参考:

http://www.cnblogs.com/luluping/archive/2011/05/06/2039475.html

该网址只包括单个对象,而我的需要把集合Bind到Datagrid上,在DataGrid上修改后在整批提交.思路是一样的.

即:类需从INotifyPropertyChanged继承

再定义好ViewModel,窗体和ViewModel 绑上就可以了.

  public class Person : INotifyPropertyChanged
    {

        public event PropertyChangedEventHandler PropertyChanged;

        private string name;
        public string Name
        {
            get
            {
                return name;
            }
            set
            {
                name = value;
                if(this.PropertyChanged != null)
                {
                    this.PropertyChanged.Invoke(this,new PropertyChangedEventArgs("Name"));

                }
            }
        }

    }

ViewModel

 public class PersonViewModel
    {
        public List<Person> LiPerson
        {
            get;
            set;
        }

    }

Form

 public partial class MainWindow : Window
    {

        PersonViewModel personViewModel;

        public MainWindow()
        {
            InitializeComponent();

            personViewModel = new PersonViewModel();
            personViewModel.LiPerson = new List<Person>();
            Person person = new Person();
            person.Name = "xxx";
            personViewModel.LiPerson.Add(person);
            Person person2 = new Person();
            person2.Name = "asd";
            personViewModel.LiPerson.Add(person2); 

            this.DataContext = personViewModel;
        }

        private void Button_Click_1(object sender, RoutedEventArgs e)
        {

            MessageBox.Show(personViewModel.LiPerson[0].Name);
            MessageBox.Show(personViewModel.LiPerson[1].Name);

        }
    }

xaml

<Window x:Class="WpfStudy.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         xmlns:my="http://schemas.microsoft.com/wpf/2008/toolkit"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="30"></RowDefinition>
            <RowDefinition Height="400*"></RowDefinition>
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="200"></ColumnDefinition>
            <ColumnDefinition Width="200*"></ColumnDefinition>
        </Grid.ColumnDefinitions>
        <Button Content="Button" Grid.Row="0" Grid.Column="1" HorizontalAlignment="Left"  VerticalAlignment="Top" Width="75" Click="Button_Click_1"/>
        <TextBox HorizontalAlignment="Left" Grid.Column="0" Height="23"  TextWrapping="Wrap" Text="{Binding Path=Name}" VerticalAlignment="Top" Width="120"/>
        <my:DataGrid Grid.Row="1"  Grid.Column="0"  Grid.ColumnSpan="5"
                     AutoGenerateColumns="False"  HorizontalAlignment="Left"
                     Name="dgSupGridView" ItemsSource="{Binding Path=LiPerson,Mode=TwoWay}"
                     ScrollViewer.HorizontalScrollBarVisibility="Auto"
                     ScrollViewer.VerticalScrollBarVisibility="Auto" >
            <my:DataGrid.Columns>
                <my:DataGridTextColumn Header="Name" IsReadOnly="False" Width="100"  Binding="{Binding Name}" />
            </my:DataGrid.Columns>
        </my:DataGrid>

    </Grid>
</Window>

对mvvm不熟悉的同学就可以用这种方式来实现批量保存了.