arcengine C# 按行政区范围加载图层数据

大家可能在平时开发中可能会遇到按行政区加载图层数据的需求，比方说整个国土资源部有某一类型专题数据有若干图层，每个图层数据的范围是整个中国，这时国土资源部开发一套系统可能有这个需求，每个省只能加载本省的数据。以下函数即为按按行政区范围创建行政区范围的图层。 比方说我想获取河南省的数据只需传入行政区图层中河南省图元的Geometry即可。另外如果如果遇到行政区层必须用 esriSpatialRelEnum.esriSpatialRelContains这个参数，否则行政区这个图层就不能只获取河南这个省份，它会把河南省的周围省份，河北，湖北，安徽，陕西，山东，山西等省份的图元也添加创建到新图层。 /// <summary> /// 按行政区范围创建行政区范围的图层 /// </summary> /// <param name="pFeatureLayer">源数据图层</param> /// <param name="pGeometry">行政区范围</param> /// <param name="bXZQ">图层是否为行政区</param> /// <returns>新创建的图层</returns> private IFeatureLayer GetSelectionLayer(IFeatureLayer pFeatureLayer, IGeometry pGeometry,bool bXZQ) { try { if (pFeatureLayer != null && pGeometry != null) { IQueryFilter pQueryFilter; ISpatialFilter pSpatialFilter = new SpatialFilterClass(); IFeatureSelection pFeatureSelection = pFeatureLayer as IFeatureSelection; pSpatialFilter.GeometryField = pFeatureLayer.FeatureClass.ShapeFieldName; pFeatureSelection.Clear(); if (!bXZQ) { pSpatialFilter.Geometry = pGeometry; pSpatialFilter.SpatialRel = esriSpatialRelEnum.esriSpatialRelIntersects; pQueryFilter = pSpatialFilter; pFeatureSelection.SelectFeatures(pQueryFilter, esriSelectionResultEnum.esriSelectionResultNew, false); } else { pSpatialFilter.SpatialRel = esriSpatialRelEnum.esriSpatialRelContains; pQueryFilter = pSpatialFilter; if(pGeometry is IGeometryCollection) { for (int i = 0; i < (pGeometry as IGeometryCollection).GeometryCount; i++) { pSpatialFilter.Geometry = (pGeometry as IGeometryCollection).get_Geometry(i); pFeatureSelection.SelectFeatures(pQueryFilter, esriSelectionResultEnum.esriSelectionResultAdd, false); } } } IFeatureLayerDefinition pFLDefinition = pFeatureLayer as IFeatureLayerDefinition; IFeatureLayer pNewFeatureLayer = pFLDefinition.CreateSelectionLayer(pFeatureLayer.Name ,true, null, null); pNewFeatureLayer.MaximumScale = pFeatureLayer.MaximumScale; pNewFeatureLayer.MinimumScale = pFeatureLayer.MinimumScale; pNewFeatureLayer.Selectable = pFeatureLayer.Selectable; pNewFeatureLayer.Visible = pFeatureLayer.Visible; pNewFeatureLayer.ScaleSymbols = pFeatureLayer.ScaleSymbols; return pNewFeatureLayer; } else { return null; } } catch (Exception Err) { MessageBox.Show(Err.Message, "获取SelectionLayer", MessageBoxButtons.OK, MessageBoxIcon.Information); return null; } } }

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