我想從onTimeOutCommand()方法中執行onCloseCommand(object sender)方法，但我不知道如何傳遞從該方法傳遞的所需參數？請參考以下代碼片段。XAML 代碼：x:name = "Recorder" // window name define in the begining//below command is used for closing this window when user clicks on close buttonCommand = "{Binding CloseCommand}" CommandParameter="{Binding ElementName=Recorder}"視圖模型代碼：CloseCommand = new DelegateCommand<object>(helper.onCloseCommand);ViewModelHelper代碼：Note: onCloseCommand() methodis working as per expectationonCloseCommand(object sender) // This method is used for closing the window on clicking on close button of this window{ if(sender != null && send is window) { (sender as window).close(); }}onTimeOutCommand() // this method is used for closing the window (the window which is passed in onCloseCommand() method) automaticlly after time out of the recording{ how to perform onCloseCommand() from this method?}
2 回答
米脂
TA貢獻1836條經驗 獲得超3個贊
您應該使用AttachProperty關閉窗口。
public static class Attach
{
#region CloseProperty
public static DependencyProperty WindowCloseProperty = DependencyProperty.RegisterAttached("WindowClose",
typeof(bool), typeof(Attach),
new UIPropertyMetadata(false, WindowClosePropertyChangedCallback));
private static void WindowClosePropertyChangedCallback(DependencyObject dependencyObject,
DependencyPropertyChangedEventArgs eventArgs)
{
var window = (Window)dependencyObject;
if (window != null && (bool)eventArgs.NewValue)
window.Close();
}
public static bool GetWindowClose(DependencyObject obj)
=> (bool)obj.GetValue(WindowCloseProperty);
public static void SetWindowClose(DependencyObject obj, bool value)
{
obj.SetValue(WindowCloseProperty, value);
}
#endregion
}
并在 XAML 中
<Window x:Class="MyProject.MyWindow"
xmlns:helper="clr-namespace:MyProject.Helper;assembly=MyProject"
helper:Attach.WindowClose="{Binding IsWindowClose}">
并且在 ViewModel 當您將 IsWindowClose 設置為 true 時關閉窗口
public bool IsWindowClose
{
get => _isWindowClose;
set => SetProperty(ref _isWindowClose, value);
}
catspeake
TA貢獻1111條經驗 獲得超0個贊
如何從此方法執行 onCloseCommand() ？
您有多種選擇，例如創建一個附加行為，在一定的超時后關閉窗口，并使用 xaml 中的行為，從而有效地將視圖模型排除在外。
我建議您在視圖模型中對窗口的 Loaded 事件做出反應并存儲窗口并在以后想要關閉它時使用它。
<Window x:Class="MyWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"
mc:Ignorable="d">
<i:Interaction.Triggers>
<i:EventTrigger EventName="Loaded">
<i:InvokeCommandAction Command="{Binding WindowLoadedCommand}" CommandParameter="{Binding RelativeSource={RelativeSource AncestorType={x:Type Window}}}"/>
</i:EventTrigger>
</i:Interaction.Triggers>
<!--- the rest of the window here --->
</Window>
但是讓我向您推薦這個答案，以獲取一種對 mvvm 更友好且更重要的是可測試的方法來從查看模型：
使窗口實現一個接口并存儲和使用它（不是完整的Window）！
因此 WindowLoadedCommand 的類型為 DelegateCommand<IClosable> 并將 IClosable 存儲在字段中。發生超時時，從字段中獲取 IClosable 并調用 Close。
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