仅通过按钮的文本内容

Question

我正在尝试获取以下内容：在我的页面中，我有一个文本框和按钮。当用户在键盘上按下 "Enter" 时，它应该与单击按钮相同。

我的代码大致如下：

<Page x:Class="MyApp.Pages.Page1"
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  .....
  DataContext="{Binding Page1VM, Source={StaticResource Locator}}">

<Page.InputBindings>
    <KeyBinding 
        Key="Enter" 
        Command="{Binding Btn_ConfirmCommand}" />
</Page.InputBindings>
<Grid>
    <Grid >
     <TextBox Text="{Binding SelectedID}" />
     <Button  Command="{Binding Btn_ConfirmCommand}"/>
    </Grid>
</Grid>

内部视图模型：

public Page1VM()
{
   Btn_ConfirmCommand = new RelayCommand(Btn_ConfirmMethod);
}
...
void Btn_ConfirmMethod()
{
  MessageBox.Show(SelectedID);
}
public string SelectedID
{
    get{return selectedID;}
    set
    {
        Set(() => SelectedID, ref selectedID, value);
        RaisePropertyChanged("SelectedID");
    }
 }

The problem: When I write some content inside the textbox and click the button the messagebox prints the content, but if I press enter key is prints an empty string

Answer 1

将Binding的UpdateSourceTrigger设为PropertyChanged:

<TextBox Text="{Binding SelectedID, UpdateSourceTrigger=PropertyChanged}" />

这应该会导致来源属性在每次击键时得到更新。默认值为 LostFocus.

仅通过按钮的文本内容

Text Content only via button

c#

wpf

keydown

mvvm