ASP.NET AJAX中的异步Web Services调用-优快云博客

本文链接：https://blog.youkuaiyun.com/chenzhiya/article/details/2013620

本文介绍了一种将Access数据库中的地理数据加载并显示在地图上的方法。通过使用ArcGIS API，可以实现从个人地理数据库（*.mdb）读取数据，并将其作为图层添加到地图中进行可视化展示。

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将Access数据文件中的数据集添加到地图中

        /// <summary>
        /// 添加Access 个人数据库数据
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void addPGMenuToolStripMenuItem_Click(object sender, EventArgs e)
        {
            OpenFileDialog dlg = new OpenFileDialog();
            dlg.Filter = "Personal Geodatabase(*.mdb)|*.mdb";
            dlg.Title = "选择数据";

            if (dlg.ShowDialog() == DialogResult.OK)
            {
                string strPath = dlg.FileName;

                IWorkspaceName pWorkspaceName = new WorkspaceNameClass();
                pWorkspaceName.WorkspaceFactoryProgID = "esriDataSourcesGDB.AccessWorkspaceFactory";
                pWorkspaceName.PathName = strPath;

                IName pName = pWorkspaceName as IName;
                IWorkspace pWorkspace = pName.Open() as IWorkspace;
                IEnumDataset pEnumDataset = pWorkspace.get_Datasets(esriDatasetType.esriDTFeatureDataset);

                AddEnumDatasetToMap(pEnumDataset, m_MapControl.Map);
            }
        }

循环添加所有数据

        /// <summary>
        /// 将Dataset添加到地图中
        /// </summary>
        /// <param name="pEnumDataset"></param>
        private void AddEnumDatasetToMap(IEnumDataset pEnumDataset, IMap pMap)
        {
            if (pEnumDataset == null)
                return;

            pEnumDataset.Reset();
            IDataset pDataset = pEnumDataset.Next();
            while (pDataset != null)
            {
                if (pDataset.Type == esriDatasetType.esriDTFeatureDataset)
                {
                    IEnumDataset pSubEnumDataset = pDataset.Subsets;
                    AddEnumDatasetToMap(pSubEnumDataset, pMap);
                }
                else if (pDataset.Type == esriDatasetType.esriDTFeatureClass)
                {
                    IFeatureClass pFeatureClass = pDataset as IFeatureClass;
                    IFeatureLayer pFeatureLayer = new FeatureLayerClass();
                    pFeatureLayer.FeatureClass = pFeatureClass;
                    pFeatureLayer.Name = pFeatureClass.AliasName;
                    pMap.AddLayer(pFeatureLayer as ILayer);
                }