Use FeatureClass to obtain and update Extent

After editing, deleting, or adding elements in FeatureClass, You can manually update its Extent using the following code:
 
(IFeatureClassManage) pFeatureClass). UpdateExtent ();
 
The method for obtaining layer Extent is:
(IGeoDataset) pFeatureClass). Extent
 
Or calculate Extent based on all the elements in the layer:
 
IEnvelope env = null;
Int feaCount = fc. FeatureCount (null );
For (int I = 0; I <feaCount; I ++)
{
If (env = null) env = fc. GetFeature (I). Extent;
Else env. Union (fc. GetFeature (I). Extent );
}
 
Note that the Extent obtained by these two methods is sometimes different.

From the column rrrrssss00