问题现象
如图所示：在高DPI（168） 缩放比例为：175%的配置下，，cefsharp控件的左侧和上部出现黑边
（电脑配置图）
（问题图）
解决办法
1.将cefsharp的gpu设置为无效，（后遗症，h5动画会出现卡顿现象，慎用）
var settings = new CefSettings();
settings.Locale = "zh-CN";
settings.CefCommandLineArgs.Add("disable-gpu", "1");
Cef.Initialize(settings);
2.将屏幕的DPI置为96（缩放比例为100%）（后遗症，不可能每个电脑都去配置）
3.支持高DPI（后遗症，winform窗体会缩放）
Cef.EnableHighDPISupport();
4.（采用）让整个程序支持高DPI
（1）为项目添加应用程序清单文件（app.manifest）,并取消下面行的注释
<application xmlns="urn:schemas-microsoft-com:asm.v3">
<windowsSettings>
<dpiAware xmlns="http://schemas.microsoft.com/SMI/2005/WindowsSettings">true</dpiAware>
</windowsSettings>
</application>
（2）将Form和UserControl的AutoScaleMode设置为Dpi
如果你做了窗体自适应（根据控件的固定大小，按照拉伸比例来拉伸），还需要以下步骤：
（3）添加获取DPI和缩放比例的帮助类（因为网上出处太多了，这里就不写引用了）
1 public class PrimaryScreenHelper 2 { 3 #region Win32 API 4 [DllImport("user32.dll")] 5 static extern IntPtr GetDC(IntPtr ptr); 6 [DllImport("gdi32.dll")] 7 static extern int GetDeviceCaps( 8 IntPtr hdc, // handle to DC 9 int nIndex // index of capability 10 ); 11 [DllImport("user32.dll", EntryPoint = "ReleaseDC")] 12 static extern IntPtr ReleaseDC(IntPtr hWnd, IntPtr hDc); 13 #endregion 14 #region DeviceCaps常量 15 const int HORZRES = 8; 16 const int VERTRES = 10; 17 const int LOGPIXELSX = 88; 18 const int LOGPIXELSY = 90; 19 const int DESKTOPVERTRES = 117; 20 const int DESKTOPHORZRES = 118; 21 #endregion 22 23 #region 属性 24 /// <summary> 25 /// 获取屏幕分辨率当前物理大小 26 /// </summary> 27 public static Size WorkingArea 28 { 29 get 30 { 31 IntPtr hdc = GetDC(IntPtr.Zero); 32 Size size = new Size(); 33 size.Width = GetDeviceCaps(hdc, HORZRES); 34 size.Height = GetDeviceCaps(hdc, VERTRES); 35 ReleaseDC(IntPtr.Zero, hdc); 36 return size; 37 } 38 } 39 /// <summary> 40 /// 当前系统DPI_X 大小 一般为96 41 /// </summary> 42 public static int DpiX 43 { 44 get 45 { 46 IntPtr hdc = GetDC(IntPtr.Zero); 47 int DpiX = GetDeviceCaps(hdc, LOGPIXELSX); 48 ReleaseDC(IntPtr.Zero, hdc); 49 return DpiX; 50 } 51 } 52 /// <summary> 53 /// 当前系统DPI_Y 大小 一般为96 54 /// </summary> 55 public static int DpiY 56 { 57 get 58 { 59 IntPtr hdc = GetDC(IntPtr.Zero); 60 int DpiX = GetDeviceCaps(hdc, LOGPIXELSY); 61 ReleaseDC(IntPtr.Zero, hdc); 62 return DpiX; 63 } 64 } 65 /// <summary> 66 /// 获取真实设置的桌面分辨率大小 67 /// </summary> 68 public static Size DESKTOP 69 { 70 get 71 { 72 IntPtr hdc = GetDC(IntPtr.Zero); 73 Size size = new Size(); 74 size.Width = GetDeviceCaps(hdc, DESKTOPHORZRES); 75 size.Height = GetDeviceCaps(hdc, DESKTOPVERTRES); 76 ReleaseDC(IntPtr.Zero, hdc); 77 return size; 78 } 79 } 80 81 /// <summary> 82 /// 获取宽度缩放百分比 83 /// </summary> 84 public static float ScaleX 85 { 86 get 87 { 88 IntPtr hdc = GetDC(IntPtr.Zero); 89 int t = GetDeviceCaps(hdc, DESKTOPHORZRES); 90 int d = GetDeviceCaps(hdc, HORZRES); 91 float ScaleX = (float)GetDeviceCaps(hdc, DESKTOPHORZRES) / (float)GetDeviceCaps(hdc, HORZRES); 92 ReleaseDC(IntPtr.Zero, hdc); 93 return ScaleX; 94 } 95 } 96 /// <summary> 97 /// 获取高度缩放百分比 98 /// </summary> 99 public static float ScaleY 100 { 101 get 102 { 103 IntPtr hdc = GetDC(IntPtr.Zero); 104 float ScaleY = (float)(float)GetDeviceCaps(hdc, DESKTOPVERTRES) / (float)GetDeviceCaps(hdc, VERTRES); 105 ReleaseDC(IntPtr.Zero, hdc); 106 return ScaleY; 107 } 108 } 109 110 /// <summary> 111 /// 获取高DPI下屏幕的缩放比例 112 /// </summary> 113 public static float ScalePercent 114 { 115 get { return DpiX / 96.0F; } 116 } 117 #endregion 118 }
（4）UserControl回复为缩放前的大小
this.lblClassTime.Location = new System.Drawing.Point((int)(8 * PrimaryScreenHelper.ScalePercent), (int)(75 * PrimaryScreenHelper.ScalePercent)); this.lblClassTime.Size = new System.Drawing.Size((int)(285 * PrimaryScreenHelper.ScalePercent), (int)(22 * PrimaryScreenHelper.ScalePercent));