Binding 的源也就是数据的源头。Binding对源的要求并不苛刻------只要它是一个对象，并且通过属性(Property)公开自己的数据，它就能作为Binding 的源。
前面一个例子已经向大家证明，如果想让作为Binding源的对象具有自动通知Binding自己属性值已经已经变化的能力，那么就需要让类实现INotifyChanged接口并在属性的Set语句中激发PropertyChanged事件。在日常生活中，除了使用这种对象作为数据源之外，我们还有更多的选择，比如用一个控件做为另一个控件的数据源，把集合作为ItemControl的数据源、使用XML作为TreeView或Menu的数据源等。
<Window x:Class="WpfApplication6.wnd631"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="wnd631" Height="110" Width="300">
<StackPanel>
<TextBox x:Name="_txtBox" BorderBrush="Black" Margin="5"/>
<Slider x:Name="_slider" Margin="5" Maximum="100"/>
</StackPanel>
</Window>_txtBox.SetBinding(TextBox.TextProperty, new Binding("Value") {
Source = _slider,
Mode = BindingMode.OneWay, // 更新的方向
UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged // 更新的时机
});
// 使用文本的长度作为Path
_txtBox2.SetBinding(TextBox.TextProperty, new Binding("Text.Length")
{
Source = _txtBox1,
Mode = BindingMode.OneWay
});
// 集合元素的默认元素当作Path
List<string> strList = new List<string>() { "Tim", "lkjh" };
_txtBox3.SetBinding(TextBox.TextProperty, new Binding("/")
{
Source = strList,
Mode = BindingMode.OneWay
});
_txtBox4.SetBinding(TextBox.TextProperty, new Binding("/Length")
{
Source = strList,
Mode = BindingMode.OneWay
});
_txtBox5.SetBinding(TextBox.TextProperty, new Binding("/[2]")
{
Source = strList,
Mode = BindingMode.OneWay
});
// 没有Path的Source
string myStr = "hfdahfdlh;ahdfhfsahdfhasdfa";
_txtBox6.SetBinding(TextBox.TextProperty, new Binding(".")
{
Source = myStr,
Mode = BindingMode.OneWay
});
<Window x:Class="WpfApplication6.wnd633"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="wnd633" Height="400" Width="600">
<Grid>
<Label Content="多级路径(一路点下去)" Margin="10,10,358,328"/>
<TextBox x:Name="_txtBox1" Margin="10,47,358,291" />
<TextBox x:Name="_txtBox2" Margin="10,121,358,217" />
<Label Content="集合的默认元素(一路斜下去)" Margin="333,10,35,328"/>
<TextBox x:Name="_txtBox3" Margin="333,47,35,291" />
<TextBox x:Name="_txtBox4" Margin="333,84,35,254" />
<TextBox x:Name="_txtBox5" Margin="333,121,35,217" />
<Label Content="没有Path的Source" Margin="10,188,358,150"/>
<TextBox x:Name="_txtBox6" Margin="10,225,358,113" />
</Grid>
</Window>
// 使用文本的长度作为Path
_txtBox2.SetBinding(TextBox.TextProperty, new Binding("Text.Length")
{
Source = _txtBox1,
Mode = BindingMode.OneWay
});
// 集合元素的默认元素当作Path
List<string> strList = new List<string>() { "Tim", "lkjh" };
_txtBox3.SetBinding(TextBox.TextProperty, new Binding("/")
{
Source = strList,
Mode = BindingMode.OneWay
});
_txtBox4.SetBinding(TextBox.TextProperty, new Binding("/Length")
{
Source = strList,
Mode = BindingMode.OneWay
});
_txtBox5.SetBinding(TextBox.TextProperty, new Binding("/[2]")
{
Source = strList,
Mode = BindingMode.OneWay
});
// 没有Path的Source
string myStr = "hfdahfdlh;ahdfhfsahdfhasdfa";
_txtBox6.SetBinding(TextBox.TextProperty, new Binding(".")
{
Source = myStr,
Mode = BindingMode.OneWay
});
WPF Data Binding之控件作为源(Source)与路径(Path)【一】
原文：http://blog.csdn.net/aoshilang2249/article/details/44850247