[DllImport("user32.dll", EntryPoint = "FindWindow", SetLastError = true)]

private static extern IntPtr FindWindow(string lpClassName, string lpWindowName);

[DllImport("user32.dll", EntryPoint = "FindWindowEx", SetLastError = true)]

private static extern IntPtr FindWindowEx(IntPtr hwndParent, uint hwndChildAfter, string lpszClass, string lpszWindow);

[DllImport("user32.dll", EntryPoint = "SendMessage", SetLastError = true, CharSet = CharSet.Auto)]

private static extern IntPtr SendMessage(IntPtr hwnd, uint wMsg, int wParam, int lParam);

[DllImport("user32.dll", EntryPoint = "SendMessage", SetLastError = true, CharSet = CharSet.Unicode)]

private static extern IntPtr SendMessage(IntPtr hWnd, uint wMsg, IntPtr wParam, string lParam);

[DllImport("user32.dll", EntryPoint = "SetForegroundWindow", SetLastError = true)]

private static extern void SetForegroundWindow(IntPtr hwnd);

引入系统API后，就可以使用FindWindow，FindWindowEx，SetForegroundWindow，SendKeys，SendMessage等等来操作应用了~

查系统API就可以搞定大部分工作了~