/// <summary>
/// 为GeometryBag生成空间索引（提高查询效率）
/// </summary>
/// <param name="geometryBag"></param>
public static void CreateSpatialIndex(this IGeometryBag geometryBag)
{
ISpatialIndex spatialIndex = (ISpatialIndex)geometryBag;
spatialIndex.AllowIndexing = true;
spatialIndex.Invalidate();
}
/// <summary>
/// union几个面要素
/// </summary>
/// <param name="lstGeometry">需要操作的面要素集合</param>
/// <returns>返回union后的图形</returns>
public static IGeometry GetUnion(List <IGeometry> lstGeometry)
{
IGeometryBag pGeoBag = new GeometryBagClass();
IGeometryCollection pGeoCol = pGeoBag as IGeometryCollection;
if (lstGeometry.Count < 1)
{
return(null);
}
if (lstGeometry[0].SpatialReference != null)
{
pGeoBag.SpatialReference = lstGeometry[0].SpatialReference;
}
object obj = System.Type.Missing;
for (int i = 0; i < lstGeometry.Count; i++)
{
IGeometry pTempGeo = lstGeometry[i];
pGeoCol.AddGeometry(pTempGeo, ref obj, ref obj);
}
ISpatialIndex pSI = pGeoBag as ISpatialIndex;
pSI.AllowIndexing = true;
pSI.Invalidate();
ITopologicalOperator pTopo = new PolygonClass();
pTopo.ConstructUnion(pGeoBag as IEnumGeometry);
IGeometry pGeo = pTopo as IGeometry;
return(pGeo);
}
private void iSpatialFilterGeometryBagToolStripMenuItem_Click(object sender, EventArgs e)
{
Stopwatch myWatch = Stopwatch.StartNew();
//从MapControl中获取的点图层
IFeatureLayer pointFeatureLayer = axMapControl1.get_Layer(0) as IFeatureLayer;
IFeatureSelection pointFeatureSelection = pointFeatureLayer as IFeatureSelection;
//从MapControl中获取的面图层
IFeatureLayer polygonFeatureLayer = axMapControl1.get_Layer(1) as IFeatureLayer;
//构建GeometryBag
IGeometryBag geometryBag = new GeometryBagClass();
IGeometryCollection geometryCollection = (IGeometryCollection)geometryBag;
IGeoDataset geoDataset = (IGeoDataset)polygonFeatureLayer;
ISpatialReference spatialReference = geoDataset.SpatialReference;
//一定要给GeometryBag赋空间参考
geometryBag.SpatialReference = spatialReference;
IQueryFilter queryFilter = new QueryFilterClass();
//Search如果返回属性值的话设置SubFields会提高效率
queryFilter.SubFields = "Shape";
//遍历面要素类，逐一获取Geometry并添加到GeometryBag中
IFeatureCursor cursor = polygonFeatureLayer.Search(queryFilter, true);
IFeature polygonFeature = null;
while ((polygonFeature = cursor.NextFeature()) != null)
{
geometryCollection.AddGeometry(polygonFeature.ShapeCopy);
}
//为GeometryBag生成空间索引，以提高效率
ISpatialIndex spatialIndex = (ISpatialIndex)geometryBag;
spatialIndex.AllowIndexing = true;
spatialIndex.Invalidate();
//构建空间查询
ISpatialFilter spatialFilter = new SpatialFilterClass();
spatialFilter.Geometry = geometryBag;
spatialFilter.GeometryField = pointFeatureLayer.FeatureClass.ShapeFieldName;
spatialFilter.SpatialRel = esriSpatialRelEnum.esriSpatialRelContains;
//选择的话可以不设置SubFields
pointFeatureSelection.SelectFeatures(spatialFilter as IQueryFilter, esriSelectionResultEnum.esriSelectionResultAdd, false);
int count = pointFeatureSelection.SelectionSet.Count;
axMapControl1.Refresh();
//释放游标
System.Runtime.InteropServices.Marshal.FinalReleaseComObject(cursor);
myWatch.Stop();
string time = myWatch.Elapsed.TotalSeconds.ToString();
MessageBox.Show("The selected point count is " + count.ToString() + "! and " + time + " Seconds");
}
private void btnOK_Click(object sender, EventArgs e)
{
//生成被查询的图层集以传入查询结果窗体
lstQueryedLayer = new List <ILayer>();
foreach (ListViewItem lvi in lstLayer.Items)
{
if (lvi.Checked == true)
{
lstQueryedLayer.Add(lvi.Tag as ILayer);
}
}
//生成选择的查询图层的搜索图形
IFeatureLayer pFL = null;
foreach (ILayer pLayer in lstSelectLayer)
{
if (pLayer.Name == cboxSearchLayer.Text)
{
pFL = pLayer as IFeatureLayer;
}
}
IGeometryBag gmBag = new GeometryBagClass();
gmBag.SpatialReference = pMap.SpatialReference;//定义空间参考，否则加入的图形将失去参考
IGeometryCollection gmCollection = gmBag as IGeometryCollection;
if (rdSelect.Checked)//如果单选框 选择的要素是选中状态
{
ISelectionSet pSelSet = (pFL as IFeatureSelection).SelectionSet;
ICursor pCursor;
pSelSet.Search(null, false, out pCursor);
IFeature pFeature = (pCursor as IFeatureCursor).NextFeature();
object obj = Type.Missing;
while (pFeature != null)
{
gmCollection.AddGeometry(pFeature.ShapeCopy, ref obj, ref obj);
pFeature = (pCursor as IFeatureCursor).NextFeature();
}
}
else//如果单选框 全部要素是选择状态
{
IFeatureCursor pFeaCursor = pFL.FeatureClass.Search(null, false);
IFeature pFea = pFeaCursor.NextFeature();
object obj = Type.Missing;
while (pFea != null)
{
gmCollection.AddGeometry(pFea.ShapeCopy, ref obj, ref obj);
pFea = pFeaCursor.NextFeature();
}
}
ISpatialIndex pSI = gmBag as ISpatialIndex;//重建索引
pSI.AllowIndexing = true;
pSI.Invalidate();
GeometryBag = gmBag;
}
/// <summary>
/// 筛选要素类中，与指定图形满足一定空间关系的要素（空间筛选时添加空间索引）
/// (参考：http://blog.csdn.net/lanpy88/article/details/7173063)
/// </summary>
/// <param name="featureClass">从中筛选要素的要素类(A)</param>
/// <param name="geometry">过滤条件图形(B)</param>
/// <param name="spatialRefEnum">空间关系类型（举例：esriSpatialRelContains表示A包含B）</param>
/// <param name="whereClause">查询条件</param>
/// <returns></returns>
public static List <IFeature> FilterFeaturesEx(this IFeatureClass featureClass, IGeometry geometry, esriSpatialRelEnum spatialRefEnum, string whereClause = "")
{
IGeometryBag geometryBag = new GeometryBagClass();
IGeometryCollection geometryCollection = (IGeometryCollection)geometryBag;
geometryBag.SpatialReference = ((IGeoDataset)featureClass).SpatialReference; //一定要给GeometryBag赋空间参考
geometryCollection.AddGeometry(geometry);
//为GeometryBag生成空间索引，以提高效率
ISpatialIndex spatialIndex = (ISpatialIndex)geometryBag;
spatialIndex.AllowIndexing = true;
spatialIndex.Invalidate();
return(FilterFeatures(featureClass, geometry, spatialRefEnum, whereClause));
}
public override bool Check(ref List <Error> checkResult)
{
IQueryFilter pQueryFilter = new QueryFilterClass();
pQueryFilter.WhereClause = m_structPara.strWhereClause;
//满足条件查询
IFeatureCursor ipFeatCursor = pSrcFeatClass.Search(pQueryFilter, true);
IFeature ipFeature = ipFeatCursor.NextFeature();
IGeometryCollection pGeometryCollection = new GeometryBagClass();
///获取满足该条件的geometry
while (ipFeature != null)
{
IGeometry ipGeometry = ipFeature.Shape;
if (ipGeometry == null)
{
ipFeature = ipFeatCursor.NextFeature();
continue;
}
object Missing = Type.Missing;
pGeometryCollection.AddGeometry(ipGeometry, ref Missing, ref Missing);
ipFeature = ipFeatCursor.NextFeature();
}
ISpatialIndex pSpatialIndex = (ISpatialIndex)pGeometryCollection;
pSpatialIndex.AllowIndexing = true;
pSpatialIndex.Invalidate();
///构建两个图层地物重叠的空间查询
ISpatialFilter pSpatialFilter = new SpatialFilterClass();
pSpatialFilter.SpatialRel = esriSpatialRelEnum.esriSpatialRelOverlaps;
///将大的GeometryCollection放入spatialfilter
pSpatialFilter.Geometry = (IGeometry)pGeometryCollection;
string Fields = "OBJECTID,Shape";
pSpatialFilter.SubFields = Fields;
IFeatureCursor ipResultFtCur = pRelFeatClass.Search(pSpatialFilter, true);
//保存数据
List <Error> pRuleResult = new List <Error>();
AddResult(ref pRuleResult, ipResultFtCur);
checkResult = pRuleResult;
if (ipResultFtCur != null)
{
Marshal.ReleaseComObject(ipResultFtCur);
ipResultFtCur = null;
}
if (pSrcFeatClass != null)
{
Marshal.ReleaseComObject(pSrcFeatClass);
pSrcFeatClass = null;
}
if (pRelFeatClass != null)
{
Marshal.ReleaseComObject(pRelFeatClass);
pRelFeatClass = null;
}
return(true);
}
public override bool Check(ref List <Hy.Check.Define.Error> checkResult)
{
//得到目标图层和关系图层的featureclass
IFeatureClass pSrcFeatClass = null;
IFeatureClass pRelFeatClass = null;
IFeatureCursor ipFeatCursor = null;
checkResult = new List <Error>();
try
{
string shapeFieldName;
IFeature ipFeature;
ISpatialFilter pSpatialFilter = new SpatialFilterClass(); //(CLSID_SpatialFilter);
//先取得要进行空间关系查询的ILayer
IFeatureWorkspace ipFtWS = null;
ipFtWS = (IFeatureWorkspace)this.m_BaseWorkspace;
pSrcFeatClass = ipFtWS.OpenFeatureClass(strSrcLayer);
pRelFeatClass = ipFtWS.OpenFeatureClass(strRelLayer);
// 1. 设置空间关系
if (!m_pPara.bCustomRel) // 使用engine预定义的空间关系
{
pSpatialFilter.SpatialRel = m_pPara.eSpatialRel;
}
else //自定义空间关系
{
pSpatialFilter.SpatialRelDescription = m_pPara.strSpatialRel;
}
// 2.设置过滤几何
shapeFieldName = pSrcFeatClass.ShapeFieldName;
pSpatialFilter.GeometryField = shapeFieldName;
// 3.设置选择先后关系，虽然对PGDB不适用，但是我也放在这儿试试
// Sets the order in which spatial searches are applied by the RDBMS (ArcSDE).
//pSpatialFilter.put_SearchOrder(esriSearchOrderSpatial);
// 4.设置where语句
if (m_pPara.strWhereClause.Length > 0)
//hehy注释，2008年2月1日，将该判断条件改为pSpatialFilter.SpatialRel = m_pPara.eSpatialRel;
{
pSpatialFilter.WhereClause = m_pPara.strWhereClause;
}
//pSpatialFilter.SpatialRel = m_pPara.eSpatialRel;
// 5.目标层生成一个大的GeometryCollection
IGeometryCollection pGeometryCollection = new GeometryBagClass(); //(CLSID_GeometryBag);
IQueryFilter pQueryFilter = new QueryFilterClass(); //(CLSID_QueryFilter);
string SubFields = "Shape";
pQueryFilter.SubFields = SubFields;
ipFeatCursor = pRelFeatClass.Search(pQueryFilter, true);
ipFeature = ipFeatCursor.NextFeature();
while (ipFeature != null)
{
IGeometry ipGeometry = ipFeature.Shape;
if (ipGeometry == null)
{
ipFeature = ipFeatCursor.NextFeature();
continue;
}
object Missing = Type.Missing;
if (!(m_pPara.bBuffer)) //不用缓冲区
{
pGeometryCollection.AddGeometry(ipGeometry, ref Missing, ref Missing);
}
else //使用缓冲
{
ITopologicalOperator ipTopo = (ITopologicalOperator)ipGeometry;
ipTopo.Simplify();
IGeometry ipGeobuffer = ipTopo.Buffer(m_pPara.dBuffer);
pGeometryCollection.AddGeometry(ipGeobuffer, ref Missing, ref Missing);
}
ipFeature = ipFeatCursor.NextFeature();
}
ISpatialIndex pSpatialIndex = (ISpatialIndex)pGeometryCollection;
pSpatialIndex.AllowIndexing = true;
pSpatialIndex.Invalidate();
// 6.将大的GeometryCollection放入spatialfilter
pSpatialFilter.Geometry = (IGeometry)pGeometryCollection;
// 7.目标图层中采用生成的spatialfilter进行查询
IFeatureCursor ipResultFtCur;
string Fields = "OBJECTID,Shape";
pSpatialFilter.SubFields = Fields;
//IQueryFilter queryFilter = new QueryFilterClass();
//queryFilter = (IQueryFilter) pSpatialFilter;
ipResultFtCur = pSrcFeatClass.Search(pSpatialFilter, true);
// 8.保存数据
AddResult(ref checkResult, ipResultFtCur);
}
catch (Exception ex)
{
return(false);
}
finally
{
if (ipFeatCursor != null)
{
Marshal.ReleaseComObject(ipFeatCursor);
ipFeatCursor = null;
}
if (pSrcFeatClass != null)
{
Marshal.ReleaseComObject(pSrcFeatClass);
pSrcFeatClass = null;
}
if (pRelFeatClass != null)
{
Marshal.ReleaseComObject(pRelFeatClass);
pRelFeatClass = null;
}
}
return(true);
}
