AE利用clip裁切后 为何裁切得到的没有内容 只有相应字段?O(∩_∩)O谢谢

Question

IFeatureClass outfeatureclass =
fworkspace.CreateFeatureClass("Clip_result", outfields, null, null, esriFeatureType.esriFTSimple, "Shape", "");

  ESRI.ArcGIS.AnalysisTools.Clip clipTool =
      new ESRI.ArcGIS.AnalysisTools.Clip(inputfeatureclass, clipfeatureclass, outfeatureclass);

  gp.Execute(clipTool, null);
  IFeatureLayer outlayer = new FeatureLayerClass();
  outlayer.FeatureClass = outfeatureclass;
  outlayer.Name = outfeatureclass.AliasName;
  pMap.AddLayer((ILayer)outlayer);
  this.axMapControl1.ActiveView.Refresh()