C# WINFORM 强制让窗体获得焦点(可实现单次置顶或持续置顶)

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原文链接：http://www.cnblogs.com/jx270/archive/2013/02/20/2919410.html

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C# WINFORM 强制让窗体获得焦点(可实现单次置顶或持续置顶)

//首先要说明的是与TopMost的效果不同，TopMost是属性定义，而且设置True后，如果不设为Flase则一直置顶，效果很差，

//以下方法解决了TopMost使用上的不足

//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 Handle1;

//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)
{
Handle1 = 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 (Handle1 != GetForegroundWindow()) //持续使该窗体置为最前,屏蔽该行则单次置顶
{
SetForegroundWindow(Handle1);

//timer2.Stop();//此处可以关掉定时器，则实现单次置顶
}
}

示例代码：

       
      namespace WinFormsApp_GetForegroundWindowTest
      {
          public partial class Form1 : Form
          {
              //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 Handle1;
              Timer timer2 = new Timer();
       
              public Form1()
              {
                  InitializeComponent();
              }
       
              Form Form2;
       
              //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)
              {
                  Handle1 = this.Handle;
                  timer2.Tick += new EventHandler(timer2_Tick);
                  timer2.Interval = 1000;
              }
       
              //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 (Handle1 != GetForegroundWindow()) //持续使该窗体置为最前,屏蔽该行则单次置顶
                  //{
                  SetForegroundWindow(Handle1);
                  timer2.Stop();//此处可以关掉定时器，则实现单次置顶
                  //}
              }
       
              private void btnSetForm2ToTop_Click(object sender, EventArgs e)
              {
                  if (Form2 == null) return;
       
                  timer2.Enabled = true;
                  Handle1 = Form2.Handle;
              }
       
              private void btn_OpenForm2_Click(object sender, EventArgs e)
              {
                  Form2 = new Form();
                  Form2.Text = "Form2";
                  Form2.Show();
              }
          }
      }
       
       
       
       
       
       
     