C#实现让窗体获得焦点的方法

usingSystem;

usingSystem.Collections.Generic;

usingSystem.ComponentModel;

usingSystem.Data;

usingSystem.Drawing;

usingSystem.Text;

usingSystem.Windows.Forms;

namespaceTest

{

  publicpartialclassPlayVoice : Form

  {

    publicPlayVoice()

    {

      InitializeComponent();

    }

    [System.Runtime.InteropServices.DllImport("user32.dll",  EntryPoint ="GetForegroundWindow", CharSet =  System.Runtime.InteropServices.CharSet.Auto, ExactSpelling =true)]

    publicstaticexternIntPtr GetF();//获得本窗体的句柄

    [System.Runtime.InteropServices.DllImport("user32.dll", EntryPoint ="SetForegroundWindow")]

    publicstaticexternboolSetF(IntPtr hWnd);//设置此窗体为活动窗体

    privatevoidtimer1_Tick(objectsender, EventArgs e)

    {

      if(this.Handle != GetF())//如果本窗口没有获得焦点

        SetF(this.Handle);//设置本窗口获得焦点

    }

  }

}