Question

Window xaml：

<Window x:Class="wndVerkoopOrderInvoer"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:vm="clr-namespace:Delivery_Manager.DeliveryManager.ViewModel"
xmlns:vw="clr-namespace:Delivery_Manager.DeliveryManager.View"
xmlns:st="clr-namespace:Delivery_Manager.Settings;assembly=Delivery_Manager_Settings"
xmlns:sf="clr-namespace:Microsoft.Surface.Presentation.Controls;assembly=Microsoft.Surface.Presentation"
Title="Bestel" Height="526" Width="1063"
WindowStyle="None" WindowStartupLocation="CenterScreen" ResizeMode="NoResize">
<Window.Resources>
    <ResourceDictionary Source="..\ResourceDictionaries\resdictMain.xaml" />
</Window.Resources>
<Grid PreviewKeyDown="cc1_PreviewKeyDown">
    <ContentControl Grid.ZIndex="2" Name="cc1" Content="{Binding VMFullScreen}">
        <ContentControl.Resources>
            <DataTemplate DataType="{x:Type vm:VMVerkoopTakeaway}">
                <vw:ucVerkoopTakeaway/>
            </DataTemplate>
            <DataTemplate DataType="{x:Type vm:VMFullScreenVerkoop}">
                <vw:ucVerkoopOrderInvoer/>
            </DataTemplate>
            <DataTemplate DataType="{x:Type vm:VMFullScreenPayment}">
                <vw:ucVerkoopKlantBetaalMethode/>
            </DataTemplate>
        </ContentControl.Resources>
    </ContentControl>
</Grid>

代码背后的代码：

    Private Sub cc1_PreviewKeyDown(sender As System.Object, e As System.Windows.Input.KeyEventArgs)
    Try

        If e.Key = Key.F12 Then

            If TypeOf (Me.cc1.DataContext) Is VMVerkoop Then
                Dim vm As VMVerkoop = Me.cc1.DataContext

                If TypeOf (vm.VMFullScreen) Is VMVerkoopTakeaway Then
                    Dim vmv As VMVerkoopTakeaway = vm.VMFullScreen
                    If vmv Is Nothing Then Exit Sub

                    If vmv.VMVerkoop.CanBetalen() Then
                        vmv.VMVerkoop.BetalenCommand.Execute(Nothing)
                    End If
                ElseIf TypeOf (vm.VMFullScreen) Is VMFullScreenPayment Then
                    Dim vmv As VMFullScreenPayment = vm.VMFullScreen
                    If vmv Is Nothing Then Exit Sub

                    If vmv.CanBetalen() Then
                        vmv.BetalingCommand.Execute(Nothing)
                    End If
                End If

            End If
        End If

    Catch ex As Exception
        WriteErrorLog("wndVerkoopOrderInvoer", "cc1_PreviewKeyDown", ex)
    End Try
End Sub

这个窗口是使用名为ucVerkoopTakeaway的usercontrol和他的viewmodel启动的，每当我按下键盘上的一个键时，子程序就会正常运行，但是当窗口的datacontext发生变化时（即：我将其中一个用户控件加载到其中）窗口）我不能让子程序运行..我需要在窗口上做一些事情.DataContextChanged ??任何帮助将不胜感激。

谢谢你

Answer 1

问题已解决，而不是在网格上使用PreviewKeyDown我在Keyboard.PreviewKeyDown="cc1_PreviewKeyDown"之后通过调用键ResizeMode="NoResize"在窗口上使用它。

更改datacontext时窗口未检测到键输入

1 个答案: