复制代码 代码如下:
//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
复制代码 代码如下:
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

复制代码 代码如下:
private void timer2_Tick(object sender, EventArgs e)
{
if (han != GetForegroundWindow())
{
SetForegroundWindow(han);
}
}