产生一个新的线程来打开一个新窗口,并从不同的线程关闭 [英] Spawn a new thread to open a new window and close it from a different thread
问题描述
现在我有C#code在不同的线程产卵一个新的窗口,这工作,但只要新的催生窗口打开,关闭和线头。如何将使它所以新的衍生窗口可从第一线程关闭?
Right now I have C# code to spawn a new window in a different thread, this works, but as soon as the new spawned window opens, it closes and the thread ends. How would I make it so the new spawned window can be closed from the first thread?
下面是一个产卵目前是如何工作的树:
Here is a "tree" of how the spawning currently works:
主线程结果
--Uses在主线程功能来启动另一种功能在单独的线程以打开瓦特窗口,使窗口中使用该线程
Main thread
--Uses a function in the main thread to start another function in a separate thread to open w window, causing the window to use that thread.
基本上我只想两个窗口都有自己的线程。并能够从第一窗口线程控制催生二级窗口
Basically I just want the two windows to each have their own thread. And be able to control the spawned secondary window from the first window thread.
推荐答案
这仅仅是一个简单的例子。这是一个有点比第一个我写的更加强劲。它通过使用P / Invoke消除现有的竞争条件。
This is just a quick example. It's a little more robust than the first one I wrote. It eliminates the existing race condition by using p/invoke.
更新仍然有竞争状态。这其中的应的完善。
Updated Still had a race condition. This one should be perfect.
using System;
using System.Drawing;
using System.Runtime.InteropServices;
using System.Threading;
using System.Windows.Forms;
class MainUIThreadForm : Form
{
[STAThread]
static void Main()
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new MainUIThreadForm());
}
private IntPtr secondThreadFormHandle;
public MainUIThreadForm()
{
Text = "First UI";
Button button;
Controls.Add(button = new Button { Name = "Start", Text = "Start second UI thread", AutoSize = true, Location = new Point(10, 10) });
button.Click += (s, e) =>
{
if (secondThreadFormHandle == IntPtr.Zero)
{
Form form = new Form
{
Text = "Second UI",
Location = new Point(Right, Top),
StartPosition = FormStartPosition.Manual,
};
form.HandleCreated += SecondFormHandleCreated;
form.HandleDestroyed += SecondFormHandleDestroyed;
form.RunInNewThread(false);
}
};
Controls.Add(button = new Button { Name = "Stop", Text = "Stop second UI thread", AutoSize = true, Location = new Point(10, 40), Enabled = false });
button.Click += (s, e) =>
{
if (secondThreadFormHandle != IntPtr.Zero)
PostMessage(secondThreadFormHandle, WM_CLOSE, IntPtr.Zero, IntPtr.Zero);
};
}
void EnableStopButton(bool enabled)
{
if (InvokeRequired)
BeginInvoke((Action)(() => EnableStopButton(enabled)));
else
{
Control stopButton = Controls["Stop"];
if (stopButton != null)
stopButton.Enabled = enabled;
}
}
void SecondFormHandleCreated(object sender, EventArgs e)
{
Control second = sender as Control;
secondThreadFormHandle = second.Handle;
second.HandleCreated -= SecondFormHandleCreated;
EnableStopButton(true);
}
void SecondFormHandleDestroyed(object sender, EventArgs e)
{
Control second = sender as Control;
secondThreadFormHandle = IntPtr.Zero;
second.HandleDestroyed -= SecondFormHandleDestroyed;
EnableStopButton(false);
}
const int WM_CLOSE = 0x0010;
[DllImport("User32.dll")]
extern static IntPtr PostMessage(IntPtr hWnd, int message, IntPtr wParam, IntPtr lParam);
}
internal static class FormExtensions
{
private static void ApplicationRunProc(object state)
{
Application.Run(state as Form);
}
public static void RunInNewThread(this Form form, bool isBackground)
{
if (form == null)
throw new ArgumentNullException("form");
if (form.IsHandleCreated)
throw new InvalidOperationException("Form is already running.");
Thread thread = new Thread(ApplicationRunProc);
thread.SetApartmentState(ApartmentState.STA);
thread.IsBackground = isBackground;
thread.Start(form);
}
}
下面是对子孙后代的第一个例子:
Here is the first example for posterity:
using System;
using System.Drawing;
using System.Threading;
using System.Windows.Forms;
class MainUIThreadForm : Form
{
[STAThread]
static void Main()
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new MainUIThreadForm());
}
SecondUIThreadForm secondThreadForm;
public MainUIThreadForm()
{
Text = "First UI";
Button button;
Controls.Add(button = new Button { Text = "Start second UI thread", AutoSize = true, Location = new Point(10, 10) });
button.Click += (s, e) =>
{
if (secondThreadForm == null || !secondThreadForm.IsHandleCreated)
secondThreadForm = SecondUIThreadForm.Create();
};
Controls.Add(button = new Button { Text = "Stop second UI thread", AutoSize = true, Location = new Point(10, 40) });
button.Click += (s, e) =>
{
if (secondThreadForm != null && secondThreadForm.IsHandleCreated)
secondThreadForm.Invoke((Action)(() => secondThreadForm.Close()));
};
}
}
class SecondUIThreadForm : Form
{
static void Main2(object state)
{
Application.Run((Form)state);
}
public static SecondUIThreadForm Create()
{
SecondUIThreadForm form = new SecondUIThreadForm();
Thread thread = new Thread(Main2);
thread.SetApartmentState(ApartmentState.STA);
thread.Start(form);
return form;
}
public SecondUIThreadForm()
{
Text = "Second UI";
}
}
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