原文:

1.通过Graphics类获取

Graphics currentGraphics = Graphics.FromHwnd(new WindowInteropHelper(mainWindow).Handle);double dpixRatio = currentGraphics.DpiX/96;

比如当前屏幕设置DPI设置1.5倍，可以通过如上通过后台获取。

2.通过Win32-ManagementClass

using (ManagementClass mc = new ManagementClass("Win32_DesktopMonitor")){    using (ManagementObjectCollection moc = mc.GetInstances())    {        int PixelsPerXLogicalInch = 0; // dpi for x        int PixelsPerYLogicalInch = 0; // dpi for y        foreach (ManagementObject each in moc)        {            PixelsPerXLogicalInch = int.Parse((each.Properties["PixelsPerXLogicalInch"].Value.ToString()));            PixelsPerYLogicalInch = int.Parse((each.Properties["PixelsPerYLogicalInch"].Value.ToString()));        }    }}

 

值得一提的是,有主副屏屏幕的情况下，是获取不了副屏的DPI的！

 

注：屏幕的物理分辨率/真实分辨率/高宽缩放比例，可参考