我知道如何在Windows Form App上实现这个功能,但是我找不到在WPF App上实现的方法。我应该如何展示一个带有Yes/No选项的阻塞式对话框,并且获取/处理用户的响应?
这是一个例子:
string sMessageBoxText = "Do you want to continue?";
string sCaption = "My Test Application";
MessageBoxButton btnMessageBox = MessageBoxButton.YesNoCancel;
MessageBoxImage icnMessageBox = MessageBoxImage.Warning;
MessageBoxResult rsltMessageBox = MessageBox.Show(sMessageBoxText, sCaption, btnMessageBox, icnMessageBox);
switch (rsltMessageBox)
{
case MessageBoxResult.Yes:
/* ... */
break;
case MessageBoxResult.No:
/* ... */
break;
case MessageBoxResult.Cancel:
/* ... */
break;
}
Public Class MyDialogViewModel
Public Event Closed()
Public Property Message As String
Public Property Cancel As MyNamespace.RelayCommand
Public Property Close As MyNamespace.RelayCommand
Public Property WasCancelled As Boolean
Public Sub New()
WasCancelled = True
Cancel = New MyNamespace.RelayCommand(AddressOf CancelClicked)
Close = New MyNamespace.RelayCommand(AddressOf CloseClicked)
End Sub
Private Sub CancelClicked()
RaiseEvent Closed()
End Sub
Private Sub CloseClicked()
WasCancelled = False
RaiseEvent Closed()
End Sub
End Class
这是我为基本的“消息”窗口设计的样式:
<Style x:Key="myMessageStyle" TargetType="{x:Type myNameSpace:CustomDialogWindow}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate>
<ControlTemplate.Resources>
<Style TargetType="{x:Type Button}" BasedOn="{StaticResource {x:Type Button}}">
<Setter Property="Width" Value="100"/>
<Setter Property="Height" Value="25"/>
</Style>
</ControlTemplate.Resources>
<Border >
<DockPanel Margin="10,10,0,10">
<TextBlock Text="{Binding Message}" Width="Auto" TextWrapping="WrapWithOverflow" DockPanel.Dock="Top"
Margin="10"
Foreground="{StaticResource MyMessageBoxForegroundColor}"/>
<DockPanel Margin="5,0,0,0" DockPanel.Dock="Bottom">
<Button Content="Ok" Command="{Binding Close}" ></Button>
<Button Content="Cancel" Command="{Binding Cancel}" HorizontalAlignment="Stretch"></Button>
</DockPanel>
</DockPanel>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
我的CustomDialogWindow只是一个没有任何内容的窗口:
(XAML)
<Window x:Class="CustomDialogWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="CustomDialogWindow"
SizeToContent="WidthAndHeight">
</Window>
Public Class CustomDialogWindow
Private Sub CustomDialogWindow_DataContextChanged(ByVal sender As Object, ByVal e As System.Windows.DependencyPropertyChangedEventArgs) Handles Me.DataContextChanged
Dim dContext As MyDialogViewModel= TryCast(DataContext, MyDialogViewModel)
If dContext IsNot Nothing Then
AddHandler DirectCast(DataContext, MyDialogViewModel).CloseWindow, AddressOf CloseWindow
End If
End Sub
Private Sub CloseWindow()
Me.Close()
End Sub
End Class
现在当我需要使用窗口时,我只需实例化一个新的CustomDialogWindow,将其DataContext设置为DialogViewModel类的一个新实例,并将其样式设置为"myMessageStyle":
Dim cdw As New CustomDialogWindow
Dim dvm As New DialogViewModel
dvm.Message = "Hello World!"
cdw.DataContext = dvm
cdw.ShowDialog()
If dvm.WasCancelled = False Then
'....'
End If
System.Windows.MessageBox
。这里是MessageBox.Show
的文档,它是 PresentationFramework 组件的一部分。 - rid