获取GetFeature(k)出错如何解决??

ILayer layer = this.axMapControlMain.get_Layer(0);
           IFeatureLayer pFeatLayer = layer as IFeatureLayer;
           IFeatureClass pFeatureClass = pFeatLayer.FeatureClass;
       
           IFeature pfeature;

获取GetFeature(k)出错如何解决?代码如下      

    int nCount = pFeatLayer.FeatureClass.FeatureCount(null);

           for (int k = 0; k < nCount; k++)
           {

               pfeature = (IFeature) pFeatLayer.FeatureClass.GetFeature(k); //这里出错

                 pnewfeature.Shape = pfeature.Shape;
                 for (int j = 0; j < pfeature.Fields.FieldCount; j++)
                 {
                     Console.WriteLine(pfeature.Fields.get_Field(j).ToString());
                 }
           }