ArcEngine中拷贝feature时候报错

  public static void MyInsertFeature(IFeatureClass pFeatureClass, IGeometry pGeometry)
    {
        IFeatureBuffer pFeatureBuffer=null;
        int typeFieldIndex = pFeatureClass.FindField("Layer");
        pFeatureBuffer = pFeatureClass.CreateFeatureBuffer();
        IFeatureCursor insertCursor = pFeatureClass.Insert(true);
        pFeatureBuffer.set_Value(typeFieldIndex, "ZBTZ");       
        pFeatureBuffer.Shape = pGeometry;
        insertCursor.InsertFeature(pFeatureBuffer);
    }

程序调试时，每次到 pFeatureBuffer.Shape = pGeometry;这里就报错“这个集合中找不到此项目。”，pGeometry明明不是null啊.求高手解答啊。困扰好久了。很郁闷。

找到原因了！！！原来是数据类型不匹配，所以不能赋值。
在featureclass定义的时候应该加上geometryDefEdit.HasZ_2 = true;
不然无法将3d数据强行赋给2d的