如何在后台弹出窗体(窗口置顶)?

Question

好像设置topmost没有效果
比如后台程序(msn)之类的,探出消息框

Answer 1

从后台弹出窗体是什么意思。Topmost 
或者 ShowDialog()方法来显示窗体。消息框就是 MessageBox.Show()的各种重载。

Answer 2

一个测试程序
Program.cs
创建TestForm窗体using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;namespace TestTopMost
{
    static class Program
    {
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new TestForm());
        }
    }
}

Answer 3

TestForm.cs
每1秒产生一个TestMessage窗口using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Threading;namespace TestTopMost
{
    public partial class TestForm : Form
    {
        private System.Timers.Timer m_timer = new System.Timers.Timer(1000);        private static bool m_bThreadRunning = false;
        private static object privateObjectLock = new object();        static bool GetThreadRunning()
        {
            bool bReturn = false;
            lock (privateObjectLock)
            {
                bReturn = m_bThreadRunning;
            }
            return bReturn;
        }        static void SetThreadRunning(bool run)
        {
            lock (privateObjectLock)
            {
                m_bThreadRunning = run;
            }
        }        public TestForm()
        {
            InitializeComponent();
            m_timer.Elapsed += new System.Timers.ElapsedEventHandler(TimerHandler);            m_timer.AutoReset = true;
            m_timer.Enabled = true;
        }        public void TimerHandler(object source, System.Timers.ElapsedEventArgs e)
        {
            Thread thread = new Thread(ThreadFunc);
            thread.Start();
        }        public static void ThreadFunc()
        {
            if (GetThreadRunning() == false)
            {
                SetThreadRunning(true);                TestMessage msg = new TestMessage();
                msg.ShowDialog();                SetThreadRunning(false);
            }
        }
    }
}

Answer 4

TestMessage.cs
弹出1秒钟之后销毁自己using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;namespace TestTopMost
{
    public partial class TestMessage : Form
    {
        private System.Timers.Timer m_timer = null;        public TestMessage()
        {
            InitializeComponent();            m_timer = new System.Timers.Timer(1000);
            m_timer.Elapsed += new System.Timers.ElapsedEventHandler(TimerHandler);
            m_timer.AutoReset = false;
            m_timer.Enabled = true;            TopMost = true;
        }
        public void TimerHandler(object source, System.Timers.ElapsedEventArgs e)
        {
            Close();
        }
    }
}

Answer 5

这个测试代码无法在当前窗口为其他程序的时候,弹出TestMessage窗体并置顶

Answer 6

后来在form load的时候调用api setforegroundwindow + setwindowpos,可以了        private System.Timers.Timer m_timer = null;
        [DllImport("user32.dll", CharSet = CharSet.Auto)]
        private static extern int SetWindowPos(IntPtr hWnd, int hWndInsertAfter, int x, int y, int Width, int Height, int flags);
        [DllImport("user32.dll", CharSet = CharSet.Auto)]
        private static extern System.IntPtr GetForegroundWindow();
        [DllImport("user32.dll", CharSet = CharSet.Auto)]
        public static extern bool SetForegroundWindow(IntPtr hWnd);this.Load += delegate 
            {
                if (Handle != GetForegroundWindow())
                    SetForegroundWindow(Handle);
                SetWindowPos(Handle, -1, 0, 0, 0, 0, 1 | 2);
            };

Answer 7

Form frm=new Form1();
frm.TopMost=True;
frm.Show();

Answer 8

winForm里这样：Form frm=new Form1(); 
frm.TopMost=True; 
frm.Show();webForm里这样：            System.Text.StringBuilder sb = new StringBuilder();
            sb.Append("<script>");
            sb.Append("window.open('BBSTieSearch.aspx"','','fullscreen =0,scrollbars=0,toolbar=0,resizable=1,top=100px,left=100px,width=800px,height=500px')");
            sb.Append("</script>");
            Page.ClientScript.RegisterStartupScript(typeof(string), "k1", sb.ToString());