WPF和放大器; MVVM光 - 通过信使关闭特定的子窗口 [英] WPF & MVVM Light - Closing a specific child window via Messenger
问题描述
在我的项目，我能够打开多个子窗口，显示并从他们返回的信息，然后通过单击按钮关闭它们。那我遇到的问题是，点击接受或取消按钮关闭所有打开的窗口。我需要找到一种方法，只关闭正确的窗口，我一直无法弄清楚如何。我使用MVVM轻，我想令牌可能是关键所在，但我还没有想出如何使他们的工作。如果有人可以帮助我，我会非常感激。
创建于主窗口的子窗口：
Messenger.Default.Register< OpenWindowMessage>（这一点，消息=方式>
{
VAR唯一键= System.Guid.NewGuid（）的ToString（）;
VAR adventurerWindowVM = SimpleIoc.Default.GetInstance< AdventurerViewModel>（唯一键）;
adventurerWindowVM.Adv = message.Argument;
变种adventurerWindow =新AdventurerView（）
{
的DataContext = adventurerWindowVM，
所有者=这个
};
adventurerWindow.Closed + =（发件人，参数）=> SimpleIoc.Default.Unregister（唯一键）;
adventurerWindow.Show（） ;
}）;
这AdventurerViewModel发送关闭窗口消息：
私人无效ExecuteAcceptCommand（）
{
Messenger.Default.Send（Adv.Name）;
Messenger.Default.Send&所述; CloseWindowMessage>（新CloseWindowMessage（））;
}
接收的关闭窗口一封邮件中AdventurerView：
Messenger.Default.Register< CloseWindowMessage>（这一点，X =>关闭（））;
标记的方法：
您有一个设置唯一生成您的每一个 AdventurerView 用。只需要使用发送时， CloseWindowMessage 作为标记。
首先，在 AdventurerViewModel 添加字符串类型的新属性说WindowKey
公共字符串WindowKey {搞定;组; }
接下来，添加一个构造函数来参加 AdventureView 。在 AdventurerView.xaml.cs ：
公共AdventurerView（）
：这（的String.Empty）{}
公共AdventurerView（字符串唯一键）{
的InitializeComponent（）;
Messenger.Default.Register< CloseWindowMessage>（这一点，唯一键，S =>关闭（））;
}
接下来，在 MainWindow.xaml.cs
开关
Messenger.Default.Register< OpenWindowMessage>（这一点，消息=>
{
VAR唯一键= System.Guid.NewGuid（）的ToString（）;
...
adventurerWindow.Show（）;
}）;
到
Messenger.Default.Register< OpenWindowMessage>（这一点，消息=>
{
VAR唯一键= System.Guid.NewGuid（）的ToString（）;
VAR adventurerWindowVM = SimpleIoc.Default.GetInstance< AdventurerViewModel>（唯一键）;
adventurerWindowVM.Adv = message.Argument;
adventurerWindowVM.WindowKey =唯一键;
变种adventurerWindow =新AdventurerView（唯一键）
{
的DataContext = adventurerWindowVM，
所有者=这个
};
adventurerWindow.Closed + =（发件人，参数）=> SimpleIoc.Default.Unregister< AdventurerViewModel>（唯一键） ;
adventurerWindow.Show（）;
}）;
最后，在 AdventurerViewModel.xaml.cs ：
开关
私人无效ExecuteAcceptCommand（）{
Messenger.Default.Send（Adv.Name）;
Messenger.Default.Send&所述; CloseWindowMessage>（新CloseWindowMessage（））;
}
到
私人无效ExecuteAcceptCommand（）{
Messenger.Default.Send（Adv.Name）;
Messenger.Default.Send< CloseWindowMessage>（新CloseWindowMessage（），WindowKey）;
}
备选：
偶虽然上面会完全正常工作，有一个替代这种方法。您的信息已经是一个自定义的强类型（ CloseWindowMessage ）。现在，你可以添加 WindowKey 作为消息的一部分，并且让每个窗口当收到一个新的 CloseWindowMessage 检查 WindowKey 反对它自己的核心消息中和关闭（）因此。
In my project I am able to open multiple child windows, display and return information from them, and then close them with a button click. The problem that I am having is that clicking the "Accept" or "Cancel" button closes all open windows. I need to find a way to only close the correct window and I haven't been able to figure out how. I am using MVVM Light and I'm thinking tokens may be the key but I haven't figured out how to make them work. If anybody could help me I'd greatly appreciate it.
Creating the child window in MainWindow:
Messenger.Default.Register<OpenWindowMessage>(this, message =>
{
var uniqueKey = System.Guid.NewGuid().ToString();
var adventurerWindowVM = SimpleIoc.Default.GetInstance<AdventurerViewModel>(uniqueKey);
adventurerWindowVM.Adv = message.Argument;
var adventurerWindow = new AdventurerView()
{
DataContext = adventurerWindowVM,
Owner = this
};
adventurerWindow.Closed += (sender, args) => SimpleIoc.Default.Unregister(uniqueKey);
adventurerWindow.Show();
});
Sending the close window message from AdventurerViewModel:
private void ExecuteAcceptCommand()
{
Messenger.Default.Send(Adv.Name);
Messenger.Default.Send<CloseWindowMessage>(new CloseWindowMessage());
}
Receiving the close window messsage in AdventurerView:
Messenger.Default.Register<CloseWindowMessage>(this, x => Close());
Token approach:
You have a uniqueKey you generate each of your AdventurerView with. Just use that when sending the CloseWindowMessage as the token.
Firstly in AdventurerViewModel add a new property of type string say "WindowKey"
public string WindowKey { get; set; }
Next add a constructor to take the unique key in AdventureView. In AdventurerView.xaml.cs:
public AdventurerView()
:this(string.Empty) {}
public AdventurerView(string uniqueKey) {
InitializeComponent();
Messenger.Default.Register<CloseWindowMessage>(this, uniqueKey, s => Close());
}
Next in MainWindow.xaml.cs
switch
Messenger.Default.Register<OpenWindowMessage>(this, message =>
{
var uniqueKey = System.Guid.NewGuid().ToString();
...
adventurerWindow.Show();
});
to
Messenger.Default.Register<OpenWindowMessage>(this, message =>
{
var uniqueKey = System.Guid.NewGuid().ToString();
var adventurerWindowVM = SimpleIoc.Default.GetInstance<AdventurerViewModel>(uniqueKey);
adventurerWindowVM.Adv = message.Argument;
adventurerWindowVM.WindowKey = uniqueKey;
var adventurerWindow = new AdventurerView(uniqueKey)
{
DataContext = adventurerWindowVM,
Owner = this
};
adventurerWindow.Closed += (sender, args) => SimpleIoc.Default.Unregister<AdventurerViewModel>(uniqueKey);
adventurerWindow.Show();
});
Finally in AdventurerViewModel.xaml.cs:
switch
private void ExecuteAcceptCommand() {
Messenger.Default.Send(Adv.Name);
Messenger.Default.Send<CloseWindowMessage>(new CloseWindowMessage());
}
to
private void ExecuteAcceptCommand() {
Messenger.Default.Send(Adv.Name);
Messenger.Default.Send<CloseWindowMessage>(new CloseWindowMessage(), WindowKey);
}
Alternate:
Even-though the above would work perfectly fine, there is an alternate to this approach. Your "Message" is already a custom strong type(CloseWindowMessage). Now you can just add WindowKey as part of the message and have each Window when it receives a new CloseWindowMessage check the WindowKey in the message against it's own key and Close() accordingly.
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