ArcGIS Runtime 加载SHAPE数据的另一种方式-动态图层

 

          ArcGIS 10.1中有一个新的功能就是动态图层（NOT DynamicLayer，动态地图服务），该动态图层简单的说，就是向一个动态服务注册一个工作空间，该工作空间中含有shape，栅格等数据，这样的话，客户端可以通过API获取这个工作空间下的所有shape数据，并可以对其进行渲染。ArcGIS Runtime和ArcGIS Server的架构类似，而API也十分相像，ArcGIS Runtime加载shape数据除了我们前面介绍的方法，还可以通过动态图层这样的方式，原理和ArcGIS Server的一样，现在说下步骤：

         加载MPK(相当于ArcGIS Server的动态地图）；

         注册一个包含shape数据的工作空间，也就是一个目录；

          遍历该目录，获取shape数据，然后加载。

核心代码：

 

             

 OpenFileDialog openFileDialog = new OpenFileDialog();
            openFileDialog.Filter = "Image files (*.bmp,*.png,*.sid,*.tif)|*.bmp;*.png;*.sid;*.tif;"; 
            openFileDialog.RestoreDirectory = true;
            openFileDialog.Multiselect = true;
            if (openFileDialog.ShowDialog() == true)
            {
                try
                {
                    // // 添加栅格
                    AddFileDatasetToDynamicMapServiceLayer(WorkspaceFactoryType.Raster,
                       Path.GetDirectoryName(openFileDialog.FileName),
                       new List(openFileDialog.SafeFileNames),
                       arcGisLocalDynamicMapServiceLayer =>
                       {
                         
                           _map.Layers.Add(arcGisLocalDynamicMapServiceLayer);
                       });
                }
                catch (Exception ex)
                {
                    MessageBox.Show("Error: Could not read file from disk. Original error: " + ex.Message);
                }
            }

 

  public void AddFileDatasetToDynamicMapServiceLayer(WorkspaceFactoryType workspaceType, string directoryPath, List fileNames, Action callback)
        {
            try
            {
                // 产生UID
                string uniqueId = Guid.NewGuid().ToString();

                // 工作空间信息
                WorkspaceInfo workspaceInfo = new WorkspaceInfo(uniqueId, workspaceType, "DATABASE=" + directoryPath);

                // 本地服务，该方法是NET3新特性
                LocalMapService localMapService = new LocalMapService
                {
                   
                    Path = _emptyMpkPath,

                    //这个属性很关键
                    EnableDynamicLayers = true
                };

                // 给动态地图服务注册工作空间
                localMapService.DynamicWorkspaces.Add(workspaceInfo);

                // 异步方法在ArcGIS Runtime中处处可见
                localMapService.StartAsync(x =>
                {
                    
                    ArcGISLocalDynamicMapServiceLayer arcGisLocalDynamicMapServiceLayer = null;

                    
                    arcGisLocalDynamicMapServiceLayer = new ArcGISLocalDynamicMapServiceLayer(localMapService)
                    {
                        // 工作空间ID
                        ID = "Workspace: " + (new DirectoryInfo(directoryPath)).Name,
                        
                        //动态图层
                        EnableDynamicLayers = true,
                    };

                    
                    arcGisLocalDynamicMapServiceLayer.Initialized += (s, e) =>
                    {
                        // 动态图层集合
                        DynamicLayerInfoCollection dynamicLayerInfoCollection = new DynamicLayerInfoCollection();

                        // 符号
                        LayerDrawingOptionsCollection layerDrawingOptionsCollection = new LayerDrawingOptionsCollection();

                       
                        int counter = 0;
                        foreach (string fileName in fileNames)
                        {
                          
                            DynamicLayerInfo dynamicLayerInfo = new DynamicLayerInfo
                            {
                                
                                ID = counter,

                              
                                Name = "Dataset: " + fileName
                            };

                           
                            DataSource dataSource = null;

                          
                            if (workspaceInfo.FactoryType == WorkspaceFactoryType.Raster)
                            {
                              
                                dataSource = new RasterDataSource
                                {
                                  
                                    DataSourceName = fileName,

                                   
                                    WorkspaceID = workspaceInfo.Id
                                };
                            }
                            else
                            {
                               
                                dataSource = new TableDataSource
                                {
                                 
                                    DataSourceName = fileName,

                                   
                                    WorkspaceID = workspaceInfo.Id
                                };

                               
                                var layerDrawOpt = new LayerDrawingOptions()
                                {
                                    
                                    LayerID = counter,

                                    // 简单渲染
                                    Renderer = new SimpleRenderer() { Symbol = new SimpleMarkerSymbol() { } },
                                };

                                
                                layerDrawingOptionsCollection.Add(layerDrawOpt);
                            }

                           
                            dynamicLayerInfo.Source = new LayerDataSource { DataSource = dataSource };

                         
                            dynamicLayerInfoCollection.Add(dynamicLayerInfo);

                    
                            counter++;
                        }

                        
                        arcGisLocalDynamicMapServiceLayer.DynamicLayerInfos = dynamicLayerInfoCollection;

                        // 这两个一一对应
                        arcGisLocalDynamicMapServiceLayer.LayerDrawingOptions = layerDrawingOptionsCollection;

                     
                        arcGisLocalDynamicMapServiceLayer.Refresh();

                       
                        callback(arcGisLocalDynamicMapServiceLayer);
                    };

                 
                    arcGisLocalDynamicMapServiceLayer.Initialize();
                });
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message,"Error",MessageBoxButton.OK,MessageBoxImage.Error);
            }
        }

 

效果如下：