# 数据绑定

数据绑定提供了一种简单的方法将数据载入应用的 UI，无需在数据的值变化时为每个控件的属性赋值。

数据绑定是一种将数据的属性与控件的属性建立映射的方式。映射可以是双向的，控件的变化可以应用在底层对象，底层对象的变化反过来也可以导致 UI 的变化。映射也可以是单向的，更改只会向一个方向传播。例如当用户编辑 `TextBox` 中的值时，其底层对象的属性会自动更新为用户输入的值。

绑定通常用于 [MVVM模式](https://msdn.microsoft.com/en-us/library/hh848246.aspx)，接下来的教程我们将假设你的代码正在使用这种模式。


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