在给ImageBrush绑定动态图片是会报以下错误。

Error    4    The provided DependencyObject is not a context for this Freezable.
Parameter name: context

 

MSDN 中是怎么说的呢？

A Freezable is a special type of object that has two states: unfrozen and frozen. When unfrozen, a Freezable appears to behave like any other object. When frozen, a Freezable can no longer be modified.
A Freezable provides a Changed event to notify observers of any modifications to the object. Freezing a Freezable can improve its performance, because it no longer needs to spend resources on change notifications. A frozen Freezable can also be shared across threads, while an unfrozen Freezable cannot.

Freeze freezable objects via the code 通过代码实现

if (myBrush.CanFreeze)

{

    // Makes the brush unmodifiable.

    myBrush.Freeze();

}

Freeze them (with ice) in XAML

<LinearGradientBrush ice:Freeze="True" xmlns:ice="http://schemas.microsoft.com/winfx/2006/xaml/presentation/options" />

参考

Model-see, Model-do, and the Poo is Optional

Leveraging Freezables to Provide an Inheritance Context for Bindings