C# WINFORM 强制让窗体获得焦点

//调用API

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

 public static extern IntPtr GetForegroundWindow(); //获得本窗体的句柄

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

 public static extern bool SetForegroundWindow(IntPtr hWnd);//设置此窗体为活动窗体

 //定义变量,句柄类型

 public IntPtr han;

在窗体加载的时候给变量赋值,即将当前窗体的句柄赋给变量

void Form1_Load(object sender, EventArgs e)

 {

 han = this.Handle;

 timer2.Enabled = true;

 }

//加载一个定时器控件,验证当前WINDOWS句柄是否和本窗体的句柄一样,如果不一样,则激活本窗体

private void timer2_Tick(object sender, EventArgs e)

 {

 if (han != GetForegroundWindow())

 {

 SetForegroundWindow(han);

 }

 }