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<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：