C# Form 焦點[讓窗體獲得焦點，一定會有您用到的時候]

資料來源: https://www.itread01.com/content/1547512584.html

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace Test
{
    public partial class PlayVoice : Form
    {
        public PlayVoice()
        {
            InitializeComponent();
        }


        [System.Runtime.InteropServices.DllImport("user32.dll", EntryPoint = "GetForegroundWindow", CharSet = System.Runtime.InteropServices.CharSet.Auto, ExactSpelling = true)]
        public static extern IntPtr GetF();             //獲得本窗體的控制代碼
        [System.Runtime.InteropServices.DllImport("user32.dll", EntryPoint = "SetForegroundWindow")]
        public static extern bool SetF(IntPtr hWnd);    //設定此窗體為活動窗體

        private void timer1_Tick(object sender, EventArgs e)
        {
            if (this.Handle != GetF())           //如果本視窗沒有獲得焦點
                SetF(this.Handle);                //設定本視窗獲得焦點
        }
    }
}