ArcGIS Runtime 加载SHAPE数据的另一种方式-动态图层

曾经终败给现在 2022-06-05 06:47 367阅读 0赞

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<string>(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<string> fileNames, Action<ArcGISLocalDynamicMapServiceLayer> 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：

![1344815448_4364.jpg][]

[1344815448_4364.jpg]: https://img-my.csdn.net/uploads/201208/13/1344815448_4364.jpg