根据图层名称获取图层
public IFeatureLayer getLayer(AxMapControl axMapControl, string layerName) { if (axMapControl.LayerCount > 0) { for (int i = 0; i < axMapControl.LayerCount; i++) { ILayer pLayer = axMapControl.get_Layer(i); if (pLayer.Name == layerName) return pLayer as FeatureLayer; } } return null; } 按条件查询图层要素，并闪烁 public void searchFeatures(AxMapControl mapControl,string sqlfilter,IFeatureLayer pFeatureLayer) { IFeatureLayer pFeatLyr = pFeatureLayer; IQueryFilter pFilter = new QueryFilterClass(); pFilter.WhereClause = sqlfilter; IFeatureCursor pFeatCursor = pFeatLyr.Search(pFilter,true); IFeature pFeat = pFeatCursor.NextFeature(); while (pFeat != null) { if (pFeat != null) { ISimpleFillSymbol pFillsyl = new SimpleFillSymbolClass(); RgbColor pRgbColor=new RgbColor(); pRgbColor.Red=255; pRgbColor.Green=0; pRgbColor.Blue=0; pFillsyl.Color = pRgbColor; object oFillsyl = pFillsyl; IPolygon pPolygon = pFeat.Shape as IPolygon; mapControl.FlashShape(pPolygon, 15, 20, pFillsyl); mapControl.DrawShape(pPolygon, ref oFillsyl); } pFeat = pFeatCursor.NextFeature(); } } sqlfilter为查询条件，如查询layer图层中，属性字段ID<10的要素：searchFeatures(axMapControl1, "ID < 10", layer);建立缓冲区，并添加到图层
public void SetBuffer(AxMapControl m_map, string LayerName, double bufferDistance，string OutputPath){ try { IFeatureLayer layer = getLayer(m_map,LayerName); if (layer == null) { LogHelper.Debug("图层不存在"); #这里是自己写的日志记录方法 return; } Geoprocessor gp = new Geoprocessor(); gp.OverwriteOutput = true; ESRI.ArcGIS.AnalysisTools.Buffer buffer = new ESRI.ArcGIS.AnalysisTools.Buffer(layer, OutputPath, bufferDistance.ToString() + " Meters"); IGeoProcessorResult results = (IGeoProcessorResult)gp.Execute(buffer, null); if (results.Status != esriJobStatus.esriJobSucceeded) { LogHelper.Debug("为图层" + layer.Name + "建立缓冲区失败\r\n"); } int k = OutputPath.LastIndexOf('\\'); string pOutFeatclsName = OutputPath.Substring((k + 1)).Trim(); string strFolder = OutputPath.Substring(0, k); m_map.AddShapeFile(strFolder, pOutFeatclsName); #添加到图层 } catch (Exception ex) { LogHelper.Error(ex.Message); } }
