在没有主窗口的 WPF 应用程序中从新线程创建窗口

Question

我正在开发一个没有主窗口的 WPF 应用程序（它使用 http://www.codeproject.com/KB/WPF/wpf_notifyicon.aspx）。

在 App.xaml.cs 中，我创建了一个新线程，它运行一些返回自定义警报集合的监视代码。该集合有一个 render() 方法，我计划用它来显示一个包含警报信息的窗口，但我不知道如何实现它。如果有任何意见，我将不胜感激。

下面的代码示例：

App.xaml：

<Application x:Class="DowntimeReportMonitor.Views.Icon.App"
         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         Startup="Application_Startup"
         Exit="Application_Exit">
<Application.Resources>
    <ResourceDictionary>
        <ResourceDictionary.MergedDictionaries>
            <ResourceDictionary Source="IconDictionary.xaml" />
        </ResourceDictionary.MergedDictionaries>
    </ResourceDictionary>
</Application.Resources>
</Application>

App.xaml.cs

using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Threading;
using System.Windows;

using Hardcodet.Wpf.TaskbarNotification;

using DowntimeReportMonitor.Core;

namespace DowntimeReportMonitor.Views.Icon
{
/// <summary>
/// Interaction logic for App.xaml
/// </summary>
public partial class App : Application
{
    private TaskbarIcon _taskbaricon;

    private AlertWorker _alertWorker;
    private Thread _alertWorkerThread;

    /// <summary>
    /// Event handler for Application startup
    /// </summary>
    /// <param name="sender">The event sender</param>
    /// <param name="e">Event arguments</param>
    private void Application_Startup(object sender, StartupEventArgs e)
    {
        // Create and start a new TaskbarIcon.
        this._taskbaricon = (TaskbarIcon)FindResource("notificationIcon");

        // Create and start a new AlertWorker.
        this._alertWorker = new AlertWorker();
        this._alertWorkerThread = new Thread(this._alertWorker.doWork);
        this._alertWorkerThread.SetApartmentState(ApartmentState.STA);
        this._alertWorkerThread.Start();
    }



    /// <summary>
    /// Event handler for Application exit
    /// </summary>
    /// <param name="sender">The event sender</param>
    /// <param name="e">Event arguments</param>
    private void Application_Exit(object sender, ExitEventArgs e)
    {
        // Stop the alert worker.
        this._alertWorker.requestStop();
        this._alertWorkerThread.Join();

        // Dispose of the notification icon.
        this._taskbaricon.Dispose();
    }
}
}

AlertWorker.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;

using DowntimeReportMonitor.Core;

namespace DowntimeReportMonitor.Views.Icon
{
class AlertWorker
{
    private volatile bool _stopRequested;

    private ReportMonitor _reportMonitor;

    public AlertWorker()
    {
        _reportMonitor = new ReportMonitor(new wpfRenderableReportAlertCollection());
    }

    public void doWork()
    {
        while (!_stopRequested)
        {
            this._reportMonitor.monitorReports().render();

            Thread.Sleep(30000);
        }
    }

    public void requestStop()
    {
        this._stopRequested = true;
    }
}
}

Answer 1

首先，您需要一个专用的 UI 线程。通常它是初始应用程序线程，但您可以采用任何线程。 （它必须是 STA 线程。）

接下来，您在该线程中启动一个调度程序 (Dispatcher.CurrentDispatcher.运行）。

接下来，您可以使用 Dispatcher.Invoke 或 Dispatcher.BeginInvoke 将命令发布到该线程。

最后，您可以将您的自定义 Window 类发布到线程 window.Show 中。