WPF关闭窗口关闭源窗口。为什么?

时间:2011-07-01 04:21:46

标签: wpf mvvm-light

我遇到的问题有点难以描述,所以请听一听。

我只是打开另一个窗口,然后尝试关闭第二个窗口。如果我使用第二个的InputBindings的命令,第二个关闭罚款。如果我直接调用关闭它会关闭第一个和第二个窗口。我希望代码能帮到这种情况。

WPF:Window1View(关键部分)

<Grid>
  <Button Content="Button" Command="{Binding RptKeyDownCommand}" />
</Grid>

Window1ViewModel :(缩短列表)

using GalaSoft.MvvmLight.Command;
var _runCommand = new RelayCommand(() => Run(), () => CanRun());

    public void Run()
    {
        var v = new Window2();
        var vm = new Window2ViewModel();
        vm.RequestClose += v.Close;
        v.DataContext = vm;
        v.ShowDialog();
    }

    public event Action RequestClose;

    var _closeCommand = new RelayCommand(() => Close(), () => CanClose());
    public void Close()
    {
        if (RequestClose != null)
            RequestClose();
    }

WPF:Window2View

<Window.InputBindings>
    <KeyBinding Key="Escape" Command="{Binding CloseCommand}" />
</Window.InputBindings>
    <TextBox Text="Hello">
        <i:Interaction.Triggers>
            <i:EventTrigger EventName="PreviewKeyDown">
                <cmd:EventToCommand 
                     Command="{Binding Close2Command, Mode=OneWay}"
                     PassEventArgsToCommand="True" />
            </i:EventTrigger>
        </i:Interaction.Triggers>
    </TextBox>

Window2ViewModel :(具有相同的Close Command加上EventToCommand结束点)

var _close2Command = new RelayCommand<KeyEventArgs>(p => Close2(p), p => CanClose2(p));

    public void Close2(KeyEventArgs e)
    {
        if (e.Key == Key.Escape)
            Close();               <- Here closes both Window1View and Window2View?
    }

2 个答案:

答案 0 :(得分:0)

从Window2ViewModel,您应该调用RequestClose not Close。

以下是Window2ViewModel的代码

RelayCommand _close2Command;
public ICommand Close2Command
{
    get
    {
        if (_close2Command == null)
        {
            _close2Command = new RelayCommand(param => CloseEx(), param => CanClose());
        }
        return _close2Command;
    }
}

public virtual void CloseEx()
{
    Close();
}

public event Action RequestClose;
public virtual void Close()
{
    if (RequestClose != null)
    {
        *RequestClose();*
    }
}
public virtual bool CanClose()
{
    return true;
}

Window1ViewModel的代码应为:

using GalaSoft.MvvmLight.Command;           
var _runCommand = new RelayCommand(() => Run(), () => CanRun()); 
var vm;

public void Run()               
{                   
    var v = new Window2();                   
    vm = new Window2ViewModel();                   
    vm.RequestClose += CloseV2;                   
    v.DataContext = vm;                   
    v.ShowDialog();               
}                          

public event Action RequestClose;                          
var _closeCommand = new RelayCommand(() => Close(), () => CanClose());    

public void CloseV2()               
{                   
    vm.Close();              
}

public void Close()               
{                   
    if (RequestClose != null)                       
    RequestClose();               
}

尝试了解您的代码。 请注意,在您的代码中,您将V1.RequestClose与V2.RequestClose绑定到同一方法Close。在我的情况下,我将它们分开,V2.RequestClose将始终调用vm.Close。

希望这会有所帮助。

答案 1 :(得分:0)

请参阅其他主题中的this answer以获取解决方案。