ArcEngine向要素类中插入数据，采用效率更高的IFeatureBuffer接口

对于ArcEngine重复地向要素类中添加数据，一般的方法是

1通过IFeatureClass.FeatureClass.CreateFeature()方法返回一个IFeature对象，

2再通过IFeature接口下的set_Value(int index,object obj)方法属性赋值等

3设置IFeature.shape属性

4最后再通过IFeature.store()方法进行存储

这种方法重复新建要素，数据量小还没影响，数据量大时，则会浪费很多时间。

推荐使用IFeatureBuffer接口

实例化方法：IFeatureBuffer pFeatureBuffer = pFeatureClass.CreateFeatureBuffer()

具体例子：

        IFeatureBuffer pFeatureBuffer = pFeatureClass.CreateFeatureBuffer();
            IFeatureCursor featurecursor = pFeatureClass.Insert(true);
            foreach (IFeature fttt in FeatureDictionary.Keys)
            {

                pFeatureBuffer.Shape = fttt.Shape;
                pFeatureBuffer.set_Value(2, fttt.get_Value(0).ToString());
                pFeatureBuffer.set_Value(3, FeatureDictionary[fttt].ToString());
                featurecursor.InsertFeature(pFeatureBuffer);

            }
            
            featurecursor.Flush();
            System.Runtime.InteropServices.Marshal.ReleaseComObject(pFeatureCursor);