问总是获得主监视器DPI

EN

public static void GetPerMonitorDPIEx(ref double dx, ref double dy, int x, 
      int y)
    {
        UInt32 dpiX = 0;
        UInt32 dpiY = 0;
        System.Drawing.Point pt = new System.Drawing.Point(x, y);
        bool m = SetProcessDpiAwarenessContext((int)PROCESS_DPI_AWARENESS.DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2);
        var mhandle = MonitorFromPoint( pt, Utils.DEFAULT_TO_NEAREST);
        uint m5 = GetDpiForMonitor(mhandle, MONITOR_DPI_TYPE.MDT_EFFECTIVE_DPI, out dpiX, out dpiY);
        dx = (double)dpiX / 96;
        dy = (double)dpiY / 96;
    }

GetPerMonitorDPIEx(ref dpiX, ref dpiY, System.Windows.Forms.Screen.AllScreens[i].Bounds.Left + 1, System.Windows.Forms.Screen.AllScreens[i].Bounds.Top +1);