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);
 }
 }