WPF DragDrop:Window.ShowModal()挂起Windows资源管理器 [英] WPF DragDrop: Window.ShowModal() hangs Windows Explorer

问题描述

我已经编写了允许将文件从Windows资源管理器拖放到WPF应用程序中的代码.在放置事件处理程序中，我启动一个窗口，该窗口显示有关放置文件的信息.如果我使用Window.ShowModally()创建此窗口，则Windows资源管理器将挂起/冻结，直到关闭我应用程序中的窗口.但是，如果我使用Window.Show()创建窗口，则不会发生此问题.不幸的是，我要求该窗口以模态显示.

I have written code to allow dropping a file from Windows Explorer into a WPF application. In my drop event handler I launch a window which displays information about the dropped file. If I create this window using Window.ShowModally() then Windows Explorer will hang/freeze until the window in my app is closed. However, if I create the window using Window.Show() this problem does not occur. Unfortunately, I require this window to be shown modally.

大概Windows Explorer线程已锁定，因为它检测到正在使用其文件之一.有没有一种方法可以通知Windows资源管理器它不需要等待应用程序中的窗口关闭?我尝试将DragDropEventArgs.Handled设置为true，但这不能解决问题.

Presumably the Windows Explorer thread is locked because it detects that one of its files is being used. Is there a way to inform Windows Explorer that it does not need to wait for the window in my application to close? I have tried setting the DragDropEventArgs.Handled to true but this does not resolve the problem.

从数据中提取数据后，我不再需要DragDrop，因此，如果可以在Drop事件处理程序中取消或结束DragDrop，那么这将是一个可接受的解决方案.

I no longer require the DragDrop once I have extracted the data from it so if there is a way to cancel or end the DragDrop in my Drop event handler then this would be an acceptable solution.

推荐答案

您不能阻止任何拖放事件处理程序，因为这会挂起D + D管道，并且预期的结果将是死信源窗口.

You cannot block in any of your drag+drop event handlers, that will hang the D+D plumbing and a dead source window is the expected outcome.

有一个简单的解决方法，只需在事件完成后要求调度员运行您的代码以后即可.优雅地使用BeginInvoke()方法.大概是:

There's a simple workaround, just ask the dispatcher to run your code later, after the event completes. Elegantly done with its BeginInvoke() method. Roughly:

    private void Window_Drop(object sender, DragEventArgs e) {
        // Do something with dropped object
        //...
        this.Dispatcher.BeginInvoke(new Action(() => {
            var dlg = new DialogWindow();
            dlg.Owner = this;
            var result = dlg.ShowDialog();
            // etc..
        }));
    }

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