Silverlight/WPF数据绑定oneTime,oneWay,twoWay

oneTime：一次性绑定，将数据给控件，绑定就结束

oneWay：数据源改变会影响绑定该数据源的控件

twoWay：数据源改变会影响绑定该数据源的控件，并且控件中数据改变时也会影响到数据源

一、oneTime

　　前台：

<TextBox Text="{Binding Name,Mode=OneTime}" Height="23" HorizontalAlignment="Left" Margin="114,92,0,0" Name="textBox1" VerticalAlignment="Top" Width="120" />

　　后台：

public class Person
{
　　string name;
　　public string Name
　　{
　　　　get { return name; }
　　　　set { name = value; }
　　}
}
Person p = new Person();
public MainPage()
{
　　InitializeComponent();
　　p.Name = "乔峰";
　　textBox1.DataContext = p;
}

二、oneWay

　　前台：

<TextBox Text="{Binding Name,Mode=OneWay}" Height="23" HorizontalAlignment="Left" Margin="114,92,0,0" Name="textBox1" VerticalAlignment="Top" Width="120" />
<Button Content="oneWay" Height="23" HorizontalAlignment="Left" Margin="159,182,0,0" Name="button1" VerticalAlignment="Top" Width="75" Click="button1_Click" />　　

　　后台：

public class Person : INotifyPropertyChanged//要实现oneWay和twoWay的绑定需要实现一个接口
{
string name;

public string Name
{
get { return name; }
set
{
name = value;
NotifyChange("Name");
}
}

#region INotifyPropertyChanged 成员
public event PropertyChangedEventHandler PropertyChanged;
private void NotifyChange(string propertyName)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
#endregion
}
Person p = new Person();
public MainPage()
{
InitializeComponent();
p.Name = "乔峰";
textBox1.DataContext = p;
}

private void button1_Click(object sender, RoutedEventArgs e)
{
p.Name = "段誉";
}

当点击oneWay这个按钮时，数据源中的改变将会影响绑定了该数据源的控件。

三、twoWay

　　前台：

<TextBox Text="{Binding Name,Mode=OneWay}" Height="23" HorizontalAlignment="Left" Margin="114,92,0,0" Name="textBox1" VerticalAlignment="Top" Width="120" />
<TextBox Text="{Binding Name,Mode=TwoWay}" Height="23" HorizontalAlignment="Left" Margin="114,144,0,0" Name="textBox2" VerticalAlignment="Top" Width="120" />

　　后台：

public class Person : INotifyPropertyChanged//要实现oneWay和twoWay的绑定需要实现一个接口
{
string name;

public string Name
{
get { return name; }
set
{
name = value;
NotifyChange("Name");
}
}

#region INotifyPropertyChanged 成员
public event PropertyChangedEventHandler PropertyChanged;
private void NotifyChange(string propertyName)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
#endregion
}
Person p = new Person();
public MainPage()
{
InitializeComponent();
p.Name = "乔峰";
textBox1.DataContext = p;
textBox2.DataContext = p;
}

让textBox1和textBox2都绑定相同的数据源，前者以oneWay模式绑定，后者以twoWay模式绑定。当修改了textBox2文本框中的内容并让文本框失去焦点时，数据源的值也改变，使textBox1和textBox2都显示新的值。

转自：http://www.cnblogs.com/sydeveloper/archive/2012/04/27/2443098.html