WPF MVVM 焦点字段加载 [英] WPF MVVM Focus Field on Load

问题描述

我有一个视图，它下面有一个 TextBox 和几个 Button.当窗口加载时，我希望 TextBox 获得焦点.

I have a View that has a single TextBox and a couple Buttons below it. When the window loads I want that TextBox to have focus.

如果我不使用 MVVM，我只会在 Loaded 事件中调用 TextBox.Focus().但是，我的 ViewModel 不知道我的视图，所以如何在不将代码放入视图的代码隐藏中的情况下完成此操作?

If I was not using MVVM I would just call TextBox.Focus() in the Loaded event. However my ViewModel does not know about my view so how can I accomplish this without putting code into the codebehind of my view?

阅读答案后，我决定将此代码放在视图 xaml 中

After reading the answers I decided to put this code in the view xaml

<DockPanel FocusManager.FocusedElement="{Binding ElementName=MessageTextBox}">    
    <TextBox Name="MessageTextBox" Text="{Binding Message}"/>
</DockPanel>

如果这不是初始页面焦点，我可能会推荐 Jon Galloway 的答案，因为它可以通过 ViewModel 进行控制.

If this were anything other than initial page focus I would probably recommend Jon Galloway's answer since it can be controlled from the ViewModel.

推荐答案

如果它让您感觉更好(它让我感觉更好)，您可以在 Xaml 中使用附加属性执行此操作:

If it makes you feel better (it makes me feel better) you can do this in Xaml using an attached property:

http://msdn.microsoft.com/en-us/library/system.windows.input.focusmanager.focusedelement.aspx

如果您知道技巧，您可以在代码隐藏中执行的任何操作都可以在 Xaml 中执行.幸运的是，您不必实施此技巧 - MS 为您做到了.

Anything you can do in codebehind you can do in Xaml if you know the tricks. Fortunately, you didn't have to implement this trick - MS did it for you.

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