矢量数据的查询与选择显示

/*按某属性值查询，并将查询结果显示在一个新的图层中*/

// 将图层声明为矢量图层

IFeatureLayer pFeatureLayer = GetGallery(gallery) as IFeatureLayer;

// 创建选择集

IFeatureSelection pFeatSel;

pFeatSel = pFeatureLayer as IFeatureSelection;

// 设定选定的颜色

Color color = this.SelectedLineColor;

pFeatSel.SelectionColor = GetRGB(color.R, color.G, color.B);

// 创建查询器及查询添加

IQueryFilter pQueryFilter;

pQueryFilter = new QueryFilterClass();

pQueryFilter.WhereClause = "FID = " + str;

// 开始选择 注意第二个参数 New 是新建

pFeatSel.SelectFeatures(pQueryFilter, esriSelectionResultEnum.esriSelectionResultNew, false);

// Add 是叠加

pFeatSel.SelectFeatures(pQueryFilter, esriSelectionResultEnum.esriSelectionResultAdd, false);

// 矢量图层定义

IFeatureLayerDefinition pFeatLyrDef;

pFeatLyrDef = pFeatureLayer as IFeatureLayerDefinition;

// 将当前选择的数据创建至新图层

string layerName = "MyLayer";

IFeatureLayer pnewFeat;

pnewFeat = pFeatLyrDef.CreateSelectionLayer(layerName, true, "", "");