转自原文 

一、  几种删除方法代码

1.  查询结果中删除

private void Delete1(IFeatureClass PFeatureclass)

{

IQueryFilter pQueryFilter = new QueryFilterClass();

pQueryFilter.WhereClause = "objectID<=" + DeleteNum;

IFeatureCursor pFeatureCursor = PFeatureclass.Search(pQueryFilter, false);IFeature pFeature = pFeatureCursor.NextFeature();

while (pFeature != null)

{

  pFeature.Delete();

  pFeature = pFeatureCursor.NextFeature();

}

System.Runtime.InteropServices.Marshal.ReleaseComObject(pQueryFilter);

}

2.  更新游标删除

private void Delete2(IFeatureClass PFeatureclass)

{

IQueryFilter pQueryFilter = new QueryFilterClass();

pQueryFilter.WhereClause = "objectID<=" + DeleteNum;

IFeatureCursor pFeatureCursor = PFeatureclass.Update(pQueryFilter, false);

IFeature pFeature = pFeatureCursor.NextFeature();

while (pFeature != null)

{

  pFeatureCursor.DeleteFeature();

  pFeature = pFeatureCursor.NextFeature();

}

System.Runtime.InteropServices.Marshal.ReleaseComObject(pQueryFilter);

 

}

3.  使用DeleteSearchedRows删除

private void Delete4(IFeatureClass PFeatureclass)

{

IQueryFilter pQueryFilter = new QueryFilterClass();

pQueryFilter.WhereClause = "objectID<=" + DeleteNum;

ITable pTable = PFeatureclass as ITable;

pTable.DeleteSearchedRows(pQueryFilter);

System.Runtime.InteropServices.Marshal.ReleaseComObject(pQueryFilter);

}

 

4.  ExecuteSQL删除

private void Delete4(IFeatureClass PFeatureclass)

{

IDataset pDataset = PFeatureclass as IDataset;

pDataset.Workspace.ExecuteSQL("delete from " + PFeatureclass.AliasName + " where objectid<=" + DeleteNum);

}

 

二、  测试性能和比较

1、 相同的数据条件，删除2000条记录

2、 测试代码

IFeatureLayer pFeatureLayer = axMapControl1.Map.get_Layer(0) as IFeatureLayer;

IFeatureClass PFeatureClass = pFeatureLayer.FeatureClass;

System.Diagnostics.Stopwatch MyWatch = new System.Diagnostics.Stopwatch();

MyWatch.Start();

Delete1(PFeatureClass)

//Delete2(PFeatureClass);

//Delete3(PFeatureClass);

//Delete4(PFeatureClass);