ILayerDescription.SelectionSymbol

最新推荐文章于 2020-03-01 15:04:07 发布

转载最新推荐文章于 2020-03-01 15:04:07 发布 · 1.4k 阅读

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#server #filter #application #object #string #layer

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本文介绍如何使用ArcObjects API将地图上特定点特征的符号更改为红色钻石形状。代码示例假设已有有效的MapServer和MapDescription对象，并且在客户端上下文中运行。示例中选择了一个名为'Halifax'的特征，并为其设置了新的符号。

The following sample code shows how to change the symbol of of a point layer's selected feature to a red diamond. It assumes that you already have a valid MapServer and MapDescription object, and that you are not working with a server context. However, if you are developing an ArcGIS Server application using a server context, you should not use New to create local ArcObjects, but you should always create objects within the server by calling CreateObject on IServerContext.

IMapServer mapServer;
IMapDescription mapDesc;

int layerID = 0;
string strMapName = mapDesc.Name;

// Select a feature
IQueryFilter filter = new QueryFilterClass();
filter.WhereClause = "Name = 'Halifax'";
IFIDSet FIDSet = mapServer.QueryFeatureIDs(strMapName, layerID, filter);

// Set color
IRgbColor color = new RgbColorClass();
color.Red = 255;

// Create new marker symbol
ISimpleMarkerSymbol markerSymbol = new SimpleMarkerSymbolClass();
markerSymbol.Size = 15;
markerSymbol.Color = color;
markerSymbol.Style = esriSimpleMarkerStyle.esriSMSDiamond;

// Hilite selected feature
ILayerDescription layerDesc = mapDesc.LayerDescriptions.get_Element(layerID);
layerDesc.SelectionFeatures = FIDSet;
layerDesc.SetSelectionSymbol = true;
layerDesc.SelectionSymbol = (ISymbol)markerSymbol;