确保单例运行时如何改变已运行的程序的窗体属性?

[yiwindlele]

该程序已被运行，但是MAINFORM的属性被设置为隐藏;

再次运行时通过process.Id获知程序已运行并获得句柄instance.MainWindowHandle

该如何利用这个句柄改变MAINFORM的属性并显示出来呢?

[DllImport("User32.dll")] private static extern bool SetForegroundWindow(IntPtr hWnd);
[DllImport("User32.dll")] private static extern bool ShowWindowAsync(IntPtr hWnd, int cmdShow);
[DllImport("user32.dll")] public static extern int ShowWindow(IntPtr hwnd,int nCmdShow);

这3个似乎都不行

[yiwindlele]

已运行的程序利用notifyIcon隐藏了

this.Hide();
this.notifyIcon1.Visible=true;

[yiwindlele]

ding......

[shinaterry]

参考代码:

Form main = Control.FromHandle(instance.MainWindowHandle) as Form;

if (main != null)
{
    main.WindowState = FormWindowState.Normal;
}

main = null;

[shinaterry]

参考代码:

Form main = Control.FromHandle(instance.MainWindowHandle) as Form;

if (main != null)
{
    main.WindowState = FormWindowState.Normal;
}

main = null;

[shinaterry]

//显示窗体
main.Show();
//前提要将notifyIcon1设为public或用公共属性封装...
main.notifyIcon1.Visible = false;
//^o^