C# 擷取目前螢幕DPI

原文: C# 擷取目前螢幕DPI 1.通過Graphics類擷取

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

比如目前螢幕設定DPI設定1.5倍，可以通過如上通過背景擷取。

2.通過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,有主副屏螢幕的情況下，是擷取不了副屏的DPI的！

注：螢幕的實體分辨率/真實分辨率/高寬縮放比例，可參考

C# API 擷取系統DPI縮放倍數跟分辨率大小