WPF MVVM - 可以单个PropertyChanged更新DataTemplate的所有Data绑定？ [英] WPF MVVM - Can a single PropertyChanged update all the Data bindings of a DataTemplate?
问题描述
我想知道是否有任何方法可以通过我的DataTemplate通过一个通知来更新所有的绑定？一个想法是有一个IsLoaded属性引发了propertieschanged，但是如何使用它来更新整个DataTemplate。我感兴趣的是一个完整的XAML解决方案。
最后我得到了我的同事 Josh Smith ，这很简单，我们只需要用 null或String.Empty 作为属性名称。这将告诉WPF绑定系统重新评估该对象的所有绑定。在使用这个过程中，我获得了两个主要的优势。
- 在每个属性上提升个别事件的开销将减少到只有一个Event-模型到UI。演出
将会增加。 - 在编写代码时，我们可以使用非常干净的{get; set;}语法，而
写入
假设：正如我在这里假设的一个非常特殊的条件，我的所有属性都在同一时间更新
我有一个 blogpost在这里讨论
更新：根据kek444的评论
I have a ViewModel class which has large number of properties(Say 50). Once the data is set on to all the properties I need to update the UI. I know that the common solution is to raise PropertyChanged on all the property setters.
I am wondering if there is any way I can notify my DataTemplate to update all its bindings through a single notification? One idea is to have a IsLoaded property which raises the propertychanged but how can I use that to update the entire DataTemplate. I am interested in a total XAML solution to this.
Finally I have got an answer from my colleague Josh Smith , it is very simple, we just need to raise a PropertyChanged event with null or String.Empty as property name. which will tell the WPF binding system to re-evaluate all the bindings of that object. I am getting two major advantage while using this.
- The overhead of raising individual events on each property will reduce to just one Event from View-Model to the UI. Performance will get increased.
- While writing code we can just use {get;set;} syntax which is clean and less writing
Assumption : As in the question I assumed here that it is a very special condition in which all my Properties are getting updated at the same time
I have a blogpost discussing this here
Update: based on the comment from kek444
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