using System;  using System.Drawing;  using System.Runtime.InteropServices;    namespace XYDES  {      public class PrimaryScreen      {          #region Win32 API                  [DllImport("user32.dll")]                   static extern IntPtr GetDC(IntPtr ptr);                  [DllImport("gdi32.dll")]                   static extern int GetDeviceCaps(                  IntPtr hdc, // handle to DC                  int nIndex // index of capability                  );                  [DllImport("user32.dll", EntryPoint = "ReleaseDC")]                   static extern IntPtr ReleaseDC(IntPtr hWnd, IntPtr hDc);          #endregion          #region DeviceCaps常量                  const int HORZRES = 8;                  const int VERTRES = 10;                  const int LOGPIXELSX = 88;                  const int LOGPIXELSY = 90;                  const int DESKTOPVERTRES = 117;                  const int DESKTOPHORZRES = 118;          #endregion           #region 属性          /// 
          /// 获取屏幕分辨率当前物理大小          /// 
             public static Size WorkingArea              {                  get {                      IntPtr hdc = GetDC(IntPtr.Zero);                      Size size = new Size();                      size.Width = GetDeviceCaps(hdc, HORZRES);                      size.Height = GetDeviceCaps(hdc, VERTRES);                      ReleaseDC(IntPtr.Zero, hdc);                      return size;                      }              }          /// 
             /// 当前系统DPI_X 大小 一般为96          /// 
              public static int DpiX              {                  get                  {                      IntPtr hdc = GetDC(IntPtr.Zero);                      int DpiX = GetDeviceCaps(hdc, LOGPIXELSX );                      ReleaseDC(IntPtr.Zero, hdc);                      return DpiX;                  }              }          /// 
          /// 当前系统DPI_Y 大小 一般为96          /// 
              public static int DpiY              {                  get                  {                      IntPtr hdc = GetDC(IntPtr.Zero);                      int DpiX = GetDeviceCaps(hdc,LOGPIXELSY);                      ReleaseDC(IntPtr.Zero, hdc);                      return DpiX;                  }              }          /// 
              /// 获取真实设置的桌面分辨率大小          /// 
              public static Size DESKTOP              {                  get                  {                      IntPtr hdc = GetDC(IntPtr.Zero);                      Size size = new Size();                      size.Width = GetDeviceCaps(hdc,DESKTOPHORZRES );                      size.Height = GetDeviceCaps(hdc, DESKTOPVERTRES);                      ReleaseDC(IntPtr.Zero, hdc);                      return size;                      }              }                /// 
              /// 获取宽度缩放百分比              /// 
              public static float ScaleX              {                  get                  {                      IntPtr hdc = GetDC(IntPtr.Zero);                      int t = GetDeviceCaps(hdc, DESKTOPHORZRES);                      int d = GetDeviceCaps(hdc, HORZRES);                      float ScaleX = (float)GetDeviceCaps(hdc, DESKTOPHORZRES) / (float)GetDeviceCaps(hdc, HORZRES);                       ReleaseDC(IntPtr.Zero, hdc);                      return ScaleX;                  }              }              /// 
              /// 获取高度缩放百分比              /// 
              public static float ScaleY              {                  get                  {                      IntPtr hdc = GetDC(IntPtr.Zero);                      float ScaleY = (float)(float)GetDeviceCaps(hdc, DESKTOPVERTRES) / (float)GetDeviceCaps(hdc, VERTRES);                      ReleaseDC(IntPtr.Zero, hdc);                      return ScaleY;                  }              }         #endregion      }  }