AE中给SDE要素集IFeatureDataset添加要素类FeatureClass遇到问题

public void ReplaceFeatureClass(IWorkspace pWorkspace,IFeatureClass sourceFeatureClass,string str_TargetDatasetName,string str_featureClassName)
        {
            IDataset pDataset = getDataset(str_TargetDatasetName);
            IFeatureClass pFeatureClass = GetFeatClass(pDataset,str_featureClassName);
            //IDataset delFeatCls = pFeatureClass as IDataset;
            //if (delFeatCls.CanDelete()) delFeatCls.Delete();
            //IDataset tempDs = sourceFeatureClass as IDataset;
            //tempDs.Rename(str_featureClassName);
            IFeatureWorkspace pFeatureWorkspace = pWorkspace as IFeatureWorkspace;
            IFeatureDataset pFeatureDataset =
pFeatureWorkspace.OpenFeatureDataset(str_TargetDatasetName);
            
            //更改源要素类的参考空间
            IGeoDataset sourceGeoDataset = sourceFeatureClass as IGeoDataset;
            IGeoDataset targetGeoDataset = pFeatureDataset as IGeoDataset;
            IGeoDatasetSchemaEdit pGeoDatasetSchemaEdit = sourceGeoDataset as IGeoDatasetSchemaEdit;
            if (pGeoDatasetSchemaEdit.CanAlterSpatialReference == true)
                pGeoDatasetSchemaEdit.AlterSpatialReference(targetGeoDataset.SpatialReference);
            //更改源要素类的参考空间

            IDatasetContainer pDatasetContainer = pFeatureDataset as IDatasetContainer;
            pDatasetContainer.AddDataset(sourceFeatureClass as IDataset);
            
        }