按Enter键时如何关闭WPF窗口(对话框)？

Question

我有一个WPF window作为模态对话框打开.

在对话框中,我有OK&Cancel按钮,其属性分别设置为IsDefault&.这两个按钮都有关闭对话框的事件处理程序.IsCancelTrueClick

这是相关的XAML:

<StackPanel Orientation="Horizontal" Grid.Row="1"  Height="45" VerticalAlignment="Bottom" HorizontalAlignment="Right" Width="190">
    <Button Content="OK"
                Height="25" Margin="10,10,10,10" Width="75" Name="btnOK" TabIndex="1600" IsDefault="True" Click="btnOK_Click"                       
                VerticalContentAlignment="Center" HorizontalContentAlignment="Center" />
    <Button Content="Cancel"
                Height="25" Margin="10,10,10,10" Width="75" Name="btnCancel" TabIndex="1700" IsCancel="True"
                VerticalContentAlignment="Center" HorizontalContentAlignment="Center" Click="btnCancel_Click" />
</StackPanel>

这是后面的代码:

private void btnOK_Click(object sender, RoutedEventArgs e)
{
    // My some business logic is here                
    this.Close();
}

private void btnCancel_Click(object sender, RoutedEventArgs e)
{
    this.Close();
}

当我按下Esc键盘上的Cancel按钮时(即使焦点不在按钮上),对话框也会按预期关闭.但是,当按下按钮时按下Enter按键时OK没有任何反应.

我DataGrid在对话框上有一个.我想在数据网格中选择任何行并按Enter键时关闭对话框.

怎么让这件事发生？

一些附加信息:对话框中有一个文本框.它有事件的事件处理程序Keyboard.PreviewKeyDown.当我在文本框中并按Enter键时,不应关闭对话框.但是我可以删除这个处理程序.重要的是要解决上面的问题.

private void tbxSearchString_PreviewKeyDown(object sender, KeyEventArgs e)
{
    if (e.Key == Key.Enter)
    {
        this.Search(); // Does some searching
    }
}

Answer 1

你的代码对我来说很好.按Enter键时关闭对话框.你可以写e.Handled = true; 在tbxSearchString_PreviewKeyDown事件中搜索功能之后的行.所以它不会关闭对话框.

<Grid>
        <TextBox Name="tbxSearchString" HorizontalAlignment="Left" Width="100" Height="30" Grid.Row="0" PreviewKeyDown="tt_PreviewKeyDown"></TextBox>
        <StackPanel Orientation="Horizontal" Grid.Row="1"  Height="45" VerticalAlignment="Bottom" HorizontalAlignment="Right" Width="190">

            <Button Content="OK" 
                Height="25" Margin="10,10,10,10" Width="75" Name="btnOK" TabIndex="1600" IsDefault="True" Click="btnOK_Click"                        
                VerticalContentAlignment="Center" HorizontalContentAlignment="Center" />
            <Button Content="Cancel" 
                Height="25" Margin="10,10,10,10" Width="75" Name="btnCancel" TabIndex="1700" IsCancel="True" 
                VerticalContentAlignment="Center" HorizontalContentAlignment="Center" Click="btnCancel_Click" />
        </StackPanel>
    </Grid>

代码背后

private void btnOK_Click(object sender, RoutedEventArgs e)
        {
            DialogResult = true; 
        }

        private void btnCancel_Click(object sender, RoutedEventArgs e)
        {
            this.Close();
        }

        private void tbxSearchString_PreviewKeyDown(object sender, KeyEventArgs e)
        {
           if (e.Key == Key.Enter)
           {
               this.Search();
               e.Handled = true;
           }
        }

Answer 2

没有内置的方法来关闭wpf中的对话框窗口.你要做的是将DialogResult设置为默认按钮.所以你需要的是以下内容:

XAML

<Button Content="OK" 
            Height="25" Margin="10,10,10,10" Width="75" Name="btnOK" TabIndex="1600" IsDefault="True" Click="btnOK_Click"                        
            VerticalContentAlignment="Center" HorizontalContentAlignment="Center" />

代码隐藏:

    private void btnOK_Click(object sender, RoutedEventArgs e)
    {
        DialogResult = true;
    }

Answer 3

你不应该自己打电话Close()或处理PreviewKeyDown.

要做到这一点,正确的方法是有确定/取消按钮和使用Button.IsDefault,Button.IsCancel以及Window.DialogResult.如果在文本框中Window未按"输入"按下,则按键将传播到该按钮,将按下默认按钮.

MyForm.xaml:

<Button x:Name="btnOk" Content="Ok" Click="btnOk_Click" IsDefault="True"/>
<Button x:Name="btnCancel" Content="Cancel" Click="btnCancel_Click" IsCancel="True"/>

MyForm.xaml.cs:

private void btnOk_Click(object sender, RoutedEventArgs e)
{
    DialogResult = true;
}

private void btnCancel_Click(object sender, RoutedEventArgs e)
{
    DialogResult = false;
}

现在点击表单中任何文本框的输入或转义将关闭表单(具有正确的结果)