zhao：优化

XHWK.WKTool/XHMicroLessonSystemWindow.xaml.cs

                     {
                         #endregion
                         //保存图片
-                        ImageHelper.SaveUIToImage(GridMain, FilePathName, gridActWidth, gridActHeight, RsW, RsH);
+                        ImageHelper.SaveUIToImage(GridMain, FilePathName, gridActWidth, gridActHeight, (int)RsW, (int)RsH);
                         //ImageHelper.SaveUIToImage(GridMain, FilePathName, (int)(GridMain.ActualWidth * (PrimaryScreen.DpiX / 96f)), (int)(GridMain.ActualHeight * (PrimaryScreen.DpiY / 96f)), 0, 0);
                         //ImageHelper.SaveUIToImage(GridMain, FilePathName, (int)(ActualWidth * (PrimaryScreen.DpiX / 96f)), (int)(ActualHeight * (PrimaryScreen.DpiY / 96f)), (int)RsW, (int)RsH);
                         //ImageHelper.SaveUIToImage(GridMain, FilePathName, (int)(ActualWidth * (PrimaryScreen.DpiX / 96f)), (int)(ActualHeight * (PrimaryScreen.DpiY / 96f)), 1281, 1026);