从视图模型类调用RichTextBox.ScrollToEnd（） [英] Call RichTextBox.ScrollToEnd() from View Model class

问题描述

您好，我尝试解决此问题，在WPF中，我使用Caliburn Micro框架。在View中，我具有可绑定的richtextbox控件，我从FlowDocument的视图模型类属性类型进行绑定。

Hi I try solve this, in WPF I use Caliburn Micro framework. In View I have bindable richtextbox control, I bind from view model class property type of FlowDocument.

我需要一种方法来在view中的richetextbox控件上调用ScrollToEnd方法

I need have a way how can I call method ScrollToEnd on richetextbox control in view.

有可能吗？因为在视图模型类中我没有richtextbox的实例。

Is it possible? Because in view model class I don’t have instance of richtextbox.

感谢您提出想法。

推荐答案

有时，有必要从文件后面的代码中调用UI代码（如果其他解决方案使事情复杂化）。请记住：模式只是建议而不是脚本。甚至有人可能会争辩说，从视图模型中公开 FlowDocument 会使视图模型过于了解UI。

Sometimes it makes sense to call UI code from the code behind file (if other solutions complicate things). Remember: patterns are just recommendations not the script. One could even argue that exposing a FlowDocument from view model makes the view model too aware about UI. But you did it because it was easier, right?

如果您不想从后面的代码进行此调用，则有两个选择：

If you don't want to make this call from code behind, here are two options:

• 考虑使用一种 ScrollToEnd（）方法向视图模型注入接口。 View实现了此方法，View模型在需要时调用它。


• 从视图模型 ScrollToEndRequested 中公开一个事件。 View订阅此事件并在触发事件时采取相应的措施。

• Consider injecting an interface to the view model, with one ScrollToEnd() method. View implements this method and view model calls it whenever it feels necessity.
• Expose an event from view model ScrollToEndRequested. View subscribes to this event and acts accordingly whenever it's fired.

其他选项（如附加行为）可能更合适，但它们确实取决于您的情况。

Other options (like attached behaviors) might be more suitable, but they are really depend on your context.

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