数据合并代码

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);
}