silverlight 数据绑定数据源改变时自动传播到目标

在datagrid中使用 Mode=TwoWay 方式绑定数据源, 数据源改变时,界面中的值没有自动改变

msdn解释：

对于 OneWay 或 TwoWay 绑定，对源的动态更改不会自动传播到目标。必须在源对象上实现 INotifyPropertyChanged 接口。

这是一段程序代码。

public class Person : INotifyPropertyChanged

```
{
```
```
    private string firstNameValue;
```
```
    public string FirstName
```
```
    {
```
```
        get { return firstNameValue; }
```
```
        set
```
```
        {
```
```
            firstNameValue = value;
```

            // Call NotifyPropertyChanged when the property is updated

            NotifyPropertyChanged("FirstName");
        }
    }
    private string lastNameValue;
    public string LastName
    {
        get { return lastNameValue; }
        set
        {
            lastNameValue = value;
            // Call NotifyPropertyChanged when the property is updated
            NotifyPropertyChanged("LastName");
        }
    }
    // Declare the PropertyChanged event
    public event PropertyChangedEventHandler PropertyChanged;
    // NotifyPropertyChanged will raise the PropertyChanged event passing the
    // source property that is being updated.
    public void NotifyPropertyChanged(string propertyName)
    {
        if (PropertyChanged != null)
        {
            PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }
    }
}

xaml页面中的代码

这是一段程序代码。

<data:DataGrid AutoGenerateColumns="False" Height="200" HorizontalAlignment="Left" Margin="20,45,0,0" Name="dataGrid1" VerticalAlignment="Top" Width="200" >

```
            <data:DataGrid.Columns>
```

                <data:DataGridTextColumn Header="姓" Binding="{Binding FirstName,Mode=TwoWay}"></data:DataGridTextColumn>

                <data:DataGridTextColumn Header="名" Binding="{Binding LastName,Mode=TwoWay}"></data:DataGridTextColumn>

```
            </data:DataGrid.Columns>
```
```
        </data:DataGrid>
```

页面Load事件，给datagrid绑定数据源

这是一段程序代码。

void MainPage_Loaded(object sender, RoutedEventArgs e)

```
      {
```
```
          Person info1 = new Person();
```
```
          info1.FirstName = "a";
```
```
          info1.LastName = "aaa";
```
```
          Person info2 = new Person();
```
```
          info2.FirstName = "b";
```
```
          info2.LastName = "bbb";
```
```
          listPerson.Add(info1);
```
```
          listPerson.Add(info2);
```

          this.dataGrid1.ItemsSource = listPerson;

```
      }
```

Button事件改变数据源数据

这是一段程序代码。

private void button1_Click(object sender, RoutedEventArgs e)

```
       {
```

           listPerson[0].FirstName = "ccccccc";

```
        }
```

页面datagrid中的值也随之改变

silverlight 数据绑定 数据源改变时自动传播到目标

silverlight 数据绑定数据源改变时自动传播到目标