public partial class Form1 : Form     { public Form1()         { InitializeComponent();             SetProcessDPIAware(); //重要             IntPtr screenDC = GetDC(IntPtr.Zero);             int dpi_x = GetDeviceCaps(screenDC, /*DeviceCap.*/LOGPIXELSX);             int dpi_y = GetDeviceCaps(screenDC, /*DeviceCap.*/LOGPIXELSY);             //_scaleUI.X = dpi_x / 96.0;             //_scaleUI.Y = dpi_y / 96.0;             ReleaseDC(IntPtr.Zero, screenDC);         }         [DllImport("user32.dll")]         static extern IntPtr GetDC(IntPtr ptr);         [DllImport("user32.dll", EntryPoint = "ReleaseDC")]         public static extern IntPtr ReleaseDC(IntPtr hWnd, IntPtr hDc);         [DllImport("gdi32.dll")]         public static extern IntPtr CreateDC(         string lpszDriver, // driver name         string lpszDevice, // device name         string lpszOutput, // not used; should be NULL         Int64 lpInitData // optional printer data         );         [DllImport("gdi32.dll")]         public static extern int GetDeviceCaps(         IntPtr hdc, // handle to DC         int nIndex // index of capability         );         [DllImport("user32.dll")]         internal static extern bool SetProcessDPIAware();         const int DRIVERVERSION = 0;         const int TECHNOLOGY = 2;         const int HORZSIZE = 4;         const int VERTSIZE = 6;         const int HORZRES = 8;         const int VERTRES = 10;         const int BITSPIXEL = 12;         const int PLANES = 14;         const int NUMBRUSHES = 16;         const int NUMPENS = 18;         const int NUMMARKERS = 20;         const int NUMFONTS = 22;         const int NUMCOLORS = 24;         const int PDEVICESIZE = 26;         const int CURVECAPS = 28;         const int LINECAPS = 30;         const int POLYGONALCAPS = 32;         const int TEXTCAPS = 34;         const int CLIPCAPS = 36;         const int RASTERCAPS = 38;         const int ASPECTX = 40;         const int ASPECTY = 42;         const int ASPECTXY = 44;         const int SHADEBLENDCAPS = 45;         const int LOGPIXELSX = 88;         const int LOGPIXELSY = 90;         const int SIZEPALETTE = 104;         const int NUMRESERVED = 106;         const int COLORRES = 108;         const int PHYSICALWIDTH = 110;         const int PHYSICALHEIGHT = 111;         const int PHYSICALOFFSETX = 112;         const int PHYSICALOFFSETY = 113;         const int SCALINGFACTORX = 114;         const int SCALINGFACTORY = 115;         const int VREFRESH = 116;         const int DESKTOPVERTRES = 117;         const int DESKTOPHORZRES = 118;         const int BLTALIGNMENT = 119; }