ArcGIS Server的操作Mxd文件详细讲解

       Server发布地图都是基于Mxd去发布的，这点与IMS使用axl文件差不多。一般来说，发布后mxd尽可能不要修改，或者在通过使用arcMap进行编辑后在重新发布。

       修改mxd会导致地图服务发生变化，因此，相对来说是一种危险的操作。但有时客户需要对Mxd进行修改，自定义的添加修改图层，并重新发布服务。

       当然，这些苛刻的需求server同样可以应付，但懒羊羊还是不建议这样做。方法总是有的，越危险的事也就越有趣。懒羊羊还是跟大家分享一下这方面的心得吧。

       下面函数实现添加一个图层到mxd文件，并设置样式。为更好的表达，函数使用返回操作结果的字符串。

/// <summary>

        /// 添加图层到Mxd文件

        /// </summary>

        /// <param name="serverContext">IServerContext</param>

        /// <param name="nfc">新图层对应的要素集</param>

        /// <param name="groupIndex">复合图层的序号</param>

        /// <param name="mxdPath">mxd所在的路径</param>

        /// <param name="picPath">用于对图层渲染的图片</param>

        /// <returns></returns>

        public string addLayerInMxd(IServerContext serverContext, IFeatureClass nfc, int groupIndex, string mxdPath,string picPath)

        {

            IMapServer pMapServer = serverContext.ServerObject as IMapServer;

            IMapServerObjects pMapServerObjs = pMapServer as IMapServerObjects;

            IMap pMap = pMapServerObjs.get_Map(pMapServer.DefaultMapName);

            bool hasLayer = hasTheLayer(pMap, nfc.AliasName);

            if (hasLayer) return "已存在该命名图层,操作未能完成";  //如果图层已经存在了，那就不添加

            if (groupIndex >= pMap.LayerCount) return "组合图层序号越界,操作未能完成";

            IMapLayers mapLayer = pMap as IMapLayers;

            IGroupLayer gLayer = pMap.get_Layer(groupIndex) as IGroupLayer;

            IFeatureLayer fl = serverContext.CreateObject("esriCarto.FeatureLayer") as IFeatureLayer;

            fl.FeatureClass = nfc;

            fl.Name = nfc.AliasName;

            //设置样式

            ISimpleRenderer pRen = serverContext.CreateObject("esriCarto.SimpleRenderer") as ISimpleRenderer;

            IGeoFeatureLayer pGeoLayer = fl as IGeoFeatureLayer;

            IPictureMarkerSymbol picMark = serverContext.CreateObject("esriDisplay.PictureMarkerSymbol") as IPictureMarkerSymbol;

            picMark.Size = 20;

            picMark.CreateMarkerSymbolFromFile(esriIPictureType.esriIPictureBitmap, picPath);

            pRen.Symbol = (ISymbol)picMark;

            pGeoLayer.Renderer = (IFeatureRenderer)pRen;

            mapLayer.InsertLayerInGroup(gLayer, pGeoLayer as ILayer, false, 3);

            //获取pMapDocument对象

            IMxdContents pMxdC;

            pMxdC = pMap as IMxdContents;

            IMapDocument pMapDocument = serverContext.CreateObject("esriCarto.MapDocument") as IMapDocument;

            pMapDocument.Open(mxdPath, "");

            pMapDocument.ReplaceContents(pMxdC);

            if (pMapDocument == null) return "文档为空不能完成操作";

            //检查地图文档是否是只读

            if (pMapDocument.get_IsReadOnly(mxdPath) == true)

            {

                return "地图文档只读，未能完成操作";

            }

            //根据相对的路径保存地图文档

            pMapDocument.Save(pMapDocument.UsesRelativePaths, false);

            return "操作成功";

        }

/// <summary>

        /// 是否存在layerName为别名的图层

        /// </summary>

        /// <param name="pMap"></param>

        /// <param name="layerName"></param>

        /// <returns></returns>

        public bool hasTheLayer(IMap pMap, string layerName)

        {

            for (int i = 0; i < pMap.LayerCount; i++)

            {

                ILayer pLayer = pMap.get_Layer(i);

                if (pLayer.Name == layerName)

                    return true;

                if (pLayer is ICompositeLayer)

                {

                    ICompositeLayer comLayer = pLayer as ICompositeLayer;

                    for (int j = 0; j < comLayer.Count; j++)

                    {

                        ILayer cLayer = comLayer.get_Layer(j);

                        if (cLayer.Name == layerName)

                            return true;

                    }

                }

            }

            return false;

        }