PageLayout作为展示map对象的容器，是一个和和MapControl很相似的控件 ，都能够在之中绘制图形和图形和管理要素。不过，PageLayout可以为不同的用途提供个性化的地图整饰功能。而且，PageLayout不仅可以管理图形元素（Graphic Element）而且可以管理框架元素（Frame Element）。注意：Element（元素）是指不保存进数据库的对象，而只存在内存，当地图发生变化的时候，这些对象就会消失。如DrawShap和DrawText等方法绘制的图形。今天主要讨论框架元素。主要包括：FrameElement，MapsurroundFrame，OLeFrame和TabelFrame等。他们都是作为不可见的容器存在的，MapFrame对象作为Map的容器，用于管理Map对象。MapSurroundFrame主要管理和Map对象相关如 比例尺，注记，指北针之类的对象。此外还有MapGrid 对象模型，可以“近似”的看作一个图层，该图层是添加地图格网的。其主要由GridLine，GridLabel，Gridborder3部分组成，该接口由MapFrame对象实现。当想一个paylout添加地图格网的代码如下：
1 private void button1_Click(object sender, EventArgs e) 2 { 3 this.axPageLayoutControl1.LoadMxFile(@"G:\GeoData\first1.mxd"); 4 IActiveView pAcitiveView = this.axPageLayoutControl1.ActiveView; 5 IMap pMap = pAcitiveView.FocusMap; 6 IGraphicsContainer pGraphicsContainer = pAcitiveView as IGraphicsContainer; 7 //IMapFrame pMapFrame = pGraphicsContainer.FindFrame(pMap) as IMapFrame; 8 IMapFrame pMapFrame = new MapFrame() as IMapFrame; 9 pMapFrame.Container = pGraphicsContainer; 10 pMapFrame.Map = pMap; 11 //UID uid = new UID(); 12 //uid.Value = "esriCaro.ScaleText"; 13 //IMapSurroundFrame mapsurroundFrame = pMapFrame.CreateSurroundFrame(uid, null); 14 15 //IElement element = mapsurroundFrame as IElement; 16 //IEnvelope envelope = new Envelope() as IEnvelope; 17 //envelope.PutCoords(1, 1, 10, 2); 18 //element.Geometry = envelope; 19 //element.Activate(pAcitiveView.ScreenDisplay); 20 //ITrackCancel trackeCancel = new TrackCancel(); 21 //element.Draw(pAcitiveView.ScreenDisplay, trackeCancel); 22 //pGraphicsContainer.AddElement(element, 0); 23 24 IMapGrids pMapGrids = pMapFrame as IMapGrids; 25 //创建一个MeasuredGrid对象 26 IMeasuredGrid pMeasureGrid = new MeasuredGrid() as IMeasuredGrid; 27 IMapGrid pMapGrid = pMeasureGrid as IMapGrid; 28 pMeasureGrid.FixedOrigin = true; 29 pMeasureGrid.Units = pMap.MapUnits; 30 pMeasureGrid.XIntervalSize = 1000; 31 pMeasureGrid.YIntervalSize = 1000; 32 pMeasureGrid.XOrigin = -180; 33 pMeasureGrid.YOrigin = -90; 34 35 // 设置MeasuredGride投影属性 36 37 IProjectedGrid pProGrid = pMeasureGrid as IProjectedGrid; 38 pProGrid.SpatialReference = pMap.SpatialReference; 39 pMapGrid.Name = "Measured Grid"; 40 //创建一个CalibratedMapGridBorder对象并设置为pMapGrid的Border属性 41 ICalibratedMapGridBorder pCalibratedBorder = new CalibratedMapGridBorder() as ICalibratedMapGridBorder; 42 pCalibratedBorder.ForegroundColor = GetColor(0, 0, 0); 43 pCalibratedBorder.BorderWidth = 0.1; 44 pCalibratedBorder.Interval = 72; 45 pCalibratedBorder.Alternating = true; 46 pMapGrid.Border = pCalibratedBorder as IMapGridBorder; 47 // 创建一个FormattedGridLabel对象 48 IFormattedGridLabel pFormattedGridLabel = new FormattedGridLabel() as IFormattedGridLabel; 49 IGridLabel pGridLabel = pFormattedGridLabel as IGridLabel; 50 stdole.StdFont pFont = new stdole.StdFont(); 51 pFont.Name = "Arial"; 52 pFont.Size = 6; 53 pGridLabel.Font = pFont as stdole.IFontDisp; ; 54 pGridLabel.Color = GetColor(4, 4, 3); 55 pGridLabel.LabelOffset = 4; 56 pGridLabel.set_LabelAlignment(esriGridAxisEnum.esriGridAxisLeft, false); 57 pGridLabel.set_LabelAlignment(esriGridAxisEnum.esriGridAxisRight, false); 58 INumericFormat pNumericFormat = new NumericFormat() as INumericFormat; 59 pNumericFormat.AlignmentOption = esriNumericAlignmentEnum.esriAlignRight; 60 pNumericFormat.RoundingOption = esriRoundingOptionEnum.esriRoundNumberOfSignificantDigits; 61 pNumericFormat.RoundingValue = 0; 62 pNumericFormat.ShowPlusSign = false; 63 pNumericFormat.ZeroPad = true; 64 pFormattedGridLabel.Format = pNumericFormat as INumberFormat; 65 //设置pMapGrid的LabelFormat属性 66 pMapGrid.LabelFormat = pGridLabel; 67 //添加格网 68 pMapGrids.AddMapGrid(pMapGrid); 69 pAcitiveView.Refresh(); 70 71 } 72 73 86
但是今天花费了一个小时也没有将Mapgrid显示出来，小可不知道是什么原因，如果那个朋友看出来可以留言给我。上段代码中的注释部分为MapSurround对象的显示。运行正常，因为笔者怀疑可能是在地里格网的参数设置问题！
