/// <summary>
/// 合并要素图形范围
/// </summary>
/// <param name="pFeatureclass">要合并的要素类</param>
/// <param name="filter">过滤条件</param>
/// <returns></returns>
public static IGeometry UnionFeature(ESRI.ArcGIS.Geodatabase.IFeatureClass pFeatureclass, string filter)
{
IGeometry geo = null;
using (ComReleaser comReleaser = new ComReleaser())
{
List <IGeometry> geoLst = new List <IGeometry>();
ESRI.ArcGIS.Geodatabase.IGeoDataset geoDataset = pFeatureclass as ESRI.ArcGIS.Geodatabase.IGeoDataset;
ESRI.ArcGIS.Geodatabase.IFeatureCursor featureCursor = pFeatureclass.Search(new ESRI.ArcGIS.Geodatabase.QueryFilter {
WhereClause = filter
}, false);
ESRI.ArcGIS.Geodatabase.IFeature pFeature = featureCursor.NextFeature();
while (pFeature != null)
{
geoLst.Add(pFeature.ShapeCopy);
if (geoLst.Count == 50)
{
geo = UnionGeometry(geoLst, geoDataset.SpatialReference);
geoLst.Clear();
geoLst.Add(geo);
}
comReleaser.ManageLifetime(pFeature);
pFeature = featureCursor.NextFeature();
}
if (geoLst.Count == 1)
{
geo = geoLst[0];
}
if (geoLst.Count > 1)
{
geo = UnionGeometry(geoLst, geoDataset.SpatialReference);
}
IZAware ipZAware = geo as IZAware;
if (ipZAware.ZAware == true)
{
ipZAware.ZAware = false;
}
comReleaser.ManageLifetime(featureCursor);
System.Runtime.InteropServices.Marshal.ReleaseComObject(featureCursor);
}
return(geo);
}
public static Boolean?isFeetFromFc(ESRI.ArcGIS.Geodatabase.IFeatureClass pFeatureClass)
{
ESRI.ArcGIS.Geodatabase.IGeoDataset geo = (ESRI.ArcGIS.Geodatabase.IGeoDataset)pFeatureClass;
if (geo.SpatialReference is ESRI.ArcGIS.Geometry.IProjectedCoordinateSystem)
{
ESRI.ArcGIS.Geometry.IProjectedCoordinateSystem proj = (ESRI.ArcGIS.Geometry.IProjectedCoordinateSystem)geo.SpatialReference;
if (proj.CoordinateUnit.Name.StartsWith("Meter"))
{
return(false);
}
else if (proj.CoordinateUnit.Name.StartsWith("Foot"))
{
return(true);
}
else
{
return(null);
}
}
else
{
return(null);
}
}
