怎么让窗口保持非激活状态

下面几段程序应该对你有帮助
程序1：
[DllImport("user32.dll", EntryPoint = "GetWindowText")]
public static extern int GetWindowText(
int hwnd,
string lpString,
int cch
);

string text = "";
int w = GetActiveWindow();//得到句柄
int g = GetWindowText(w, text, 255);
string str = text;

程序2：
SetWindowPos(f.Handle, HWND_TOPMOST, 0, 0, f.Width, f.Height, SWP_NOACTIVATE ¦ SWP_NOZORDER);

string text; -> StringBulider text = "";

程序3：

SetWindowPos(f.Handle, HWND_BOTTOM, 0, 0, f.Width, f.Height, SWP_NOACTIVATE);
SetWindowPos(f.Handle, HWND_NOTOPMOST, 0, 0, f.Width, f.Height, SWP_NOACTIVATE);

SetWindowPos(f.Handle, HWND_TOPMOST, 0, 0, f.Width, f.Height, SWP_NOACTIVATE ¦ SWP_NOZORDER);
...