SaveFileDialog dialog = new SaveFileDialog();

             dialog.Title = "保存输出图片";

             dialog.Filter = "JPG文件(*.jpg)|*.jpg|BMP文件(*.bmp)|*.bmp||";

             if (dialog.ShowDialog() == DialogResult.OK)

             {

                 tagRECT grect;

                 string str = System.IO.Path.GetExtension(dialog.FileName).ToLower();

                 IExport export = null;

                 if (str == ".jpg")

                 {

                     export = new ExportJPEGClass();

                 }

                 else

                 {

                     export = new ExportBMPClass();

                 }

                 export.ExportFileName = dialog.FileName;

                 int num = 0x60;

                 int num2 = ;

                 export.Resolution = num2;

                 grect.left = ;

                 grect.top = ;

                 tagRECT deviceFrame = this.m_pMapControl.ActiveView.ScreenDisplay.DisplayTransformation.get_DeviceFrame();//.DeviceFrame;

                 grect.right = (int) (((deviceFrame.right - deviceFrame.left) * num2) / ((double) num));

                 grect.bottom = (int) (((deviceFrame.bottom - deviceFrame.top) * num2) / ((double) num));

                 IEnvelope envelope = new EnvelopeClass();

                 envelope.PutCoords((double) grect.left, (double) grect.top, (double) grect.right, (double) grect.bottom);

                 export.PixelBounds = envelope;

                 int hdc = export.StartExporting();

                 double resolution = export.Resolution;

                 this.m_pMapControl.ActiveView.Output(hdc, (int) resolution, ref grect, null, null);

                 export.FinishExporting();

                 export.Cleanup();

             }