这个例子中，我创建了1000条要素，并结合缓冲将数据写到文件中，并且添加了时间统计，当然数据是我捏造的，还请原谅，这个花费的时间为0.978秒，速度还行。

IWorkspaceFactory pWsF = new ShapefileWorkspaceFactory();

IFeatureWorkspace pFtWs = pWsF.OpenFromFile(@"E:\arcgis\Engine\数据", 0) as IFeatureWorkspace;

IFeatureClass pFtClass = pFtWs.OpenFeatureClass("edit");

IFeatureLayer pFt = new FeatureLayerClass();

pFt.FeatureClass = pFtClass;
                pFt.Name = "画线";

axMapControl1.Map.AddLayer(pFt as ILayer);

axMapControl1.Refresh();

//为了进一步说明Idataset,我特意从下面的代码

IDataset pDataset = pFtClass as IDataset;

IWorkspace pWs = pDataset.Workspace;

pWsEdit = pWs as IWorkspaceEdit;

pWsEdit.StartEditing(true);

pWsEdit.StartEditOperation();

pBoolStart = pWsEdit.IsBeingEdited();

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

TimeWatch.Start();

IFeatureBuffer pFeatureBuffer = pFtClass.CreateFeatureBuffer();

IFeatureCursor pFtCusor = pFtClass.Insert(true);

ESRI.ArcGIS.Geometry.IPolyline polyline = new ESRI.ArcGIS.Geometry.PolylineClass();
                ESRI.ArcGIS.Geometry.IPoint pPoint = new ESRI.ArcGIS.Geometry.PointClass();

ESRI.ArcGIS.Geometry.IPoint pPoint2 = new ESRI.ArcGIS.Geometry.PointClass();
                for (int i = 0; i < 1000; i++)
                {

pPoint.X = 48 + i * 102;

pPoint.Y = 65 + i * 10;

polyline.FromPoint = pPoint;

pPoint2.X = 480 + i * 10;

pPoint2.Y = 615 + i * 102;

polyline.ToPoint = pPoint2;

pFeatureBuffer.Shape = polyline;

pFeatureBuffer.set_Value(2, i);

object pFeatureOID = pFtCusor.InsertFeature(pFeatureBuffer);
                }

pFtCusor.Flush();

pWsEdit.StopEditing(true);

axMapControl1.Refresh();
                TimeWatch.Stop();

MessageBox.Show(TimeWatch.Elapsed.Milliseconds.ToString());

效果如下：