要编码实现合并线状要素,在网上找了好多资料,大概都类似下面的代码,但是执行了之后都没什么效果,并没有合并,不知道为什么哦,请大神们给点意见吧!
// Polyline pPolyline = null;
ITopologicalOperator pTopologicalOperator;
IFeature pFeatureTemp = pTypeArray[0] as IFeature;
IGeometry pGeometry = pFeatureTemp.Shape;
int jj = 1;
while (jj < nFeatureCount)
{
pTopologicalOperator = pGeometry as ITopologicalOperator;
pGeometry = ((IFeature)pTypeArray[jj]).Shape;
pGeometry = pTopologicalOperator.Union(pGeometry as IGeometry);
jj++;
}
// pPolyline = pGeometry as IPolyline;ArcEngine线状要素合并错误UnionArcEngine编辑
// Polyline pPolyline = null;
ITopologicalOperator pTopologicalOperator;
IFeature pFeatureTemp = pTypeArray[0] as IFeature;
IGeometry pGeometry = pFeatureTemp.Shape;
int jj = 1;
while (jj < nFeatureCount)
{
pTopologicalOperator = pGeometry as ITopologicalOperator;
pGeometry = ((IFeature)pTypeArray[jj]).Shape;
pGeometry = pTopologicalOperator.Union(pGeometry as IGeometry);
jj++;
}
// pPolyline = pGeometry as IPolyline;ArcEngine线状要素合并错误UnionArcEngine编辑
private void MergeFeatures(List<int> OneFeatureArr
{
IFeatureLayer tFeatureLayer = tSelectLayer as IFeatureLayer;
IFeatureClass pFeatureClass = tFeatureLayer.FeatureClass;
var pDataset = pFeatureClass as IDataset;
IWorkspace pWorkspace = pDataset.Workspace;
IFeatureWorkspace pFWs = pWorkspace as IFeatureWorkspace;
pCommonFeaureWorkspace = pFWs; IWorkspaceEdit pWorkspaceEdit = (IWorkspaceEdit)pCommonFeaureWorkspace;
pWorkspaceEdit.StartEditing(true);
pWorkspaceEdit.StartEditOperation(); IFeatureLayer pFeatureLayer = tSelectLayer as IFeatureLayer;
IFeatureCursor pEF = pFeatureLayer.Search(null, false);
IFeature pFeatureFirst = pEF.NextFeature();
while (pFeatureFirst != null)
{//找到在数组里的第一个要素
if (pFeatureFirst.OID == OneFeatureArr[0])
{
//OneFeatureArr.RemoveAt(0);//除掉第一个要素
break;
}
else
pFeatureFirst = pEF.NextFeature();
}
pEF = pFeatureLayer.Search(null, false); IGeometry pGeometryFirst = pFeatureFirst.Shape;
ITopologicalOperator2 pTopOperatorFirst = (ITopologicalOperator2)pGeometryFirst;
IRelationalOperator pRelOperatorFirst = (IRelationalOperator)pGeometryFirst;
pTopOperatorFirst.IsKnownSimple_2 = false;
pTopOperatorFirst.Simplify();
pGeometryFirst.SnapToSpatialReference(); IGeometry pGeometrySecond=null;
IFeature pFeatureSecond = pEF.NextFeature(); IGeometryCollection Geometrybag = new GeometryBagClass();//装geometry的袋子
object oMissing = Type.Missing;
while (pFeatureSecond != null)
{
if (OneFeatureArr.IndexOf(pFeatureSecond.OID) == -1)
{
pFeatureSecond = pEF.NextFeature();
continue;
}
pGeometrySecond = pFeatureSecond.ShapeCopy;
Geometrybag.AddGeometry(pGeometrySecond, ref oMissing, ref oMissing);//将geometry装进袋子
pFeatureSecond = pEF.NextFeature();
}
IEnumGeometry tEnumGeometry =(IEnumGeometry) Geometrybag;
pTopOperatorFirst.ConstructUnion(tEnumGeometry); pTopOperatorFirst.IsKnownSimple_2 = false;
pTopOperatorFirst.Simplify();
pFeatureFirst.Shape = pGeometryFirst;
pFeatureFirst.Store(); pWorkspaceEdit.StopEditOperation();
pWorkspaceEdit.StopEditing(true);
}