WPF MVVM聚焦场对负载 [英] WPF MVVM Focus Field on Load

问题描述

我有了一个文本框和几个按钮 S下来看。当窗口加载我想要的文本框有焦点。

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.

如果我没有使用MVVM，我只想叫 TextBox.Focus（）在Loaded事件。 ？可是我的视图模型不知道我的看法，所以我怎么能做到这一点不把代码放到我的看法的代码隐藏

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?

编辑：
读取应答后我决定把这个代码视图中的XAML

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>

如果这个比初始页面焦点等我可能会建议乔恩·加洛韦的回答什么，因为它可以控制从视图模型。

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

如果它让你感觉更好（这让我感觉更好），你可以使用在XAML中做到这一点附加属性：

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

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

任何你在代码隐藏你可以在XAML做，如果你知道的技巧。幸运的是，你没有实现这一招 - MS这样做是为了你。

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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