ArcEngine创建IFeature的三种方法

时间:2022-05-20 14:58:38


在ArcGIS Resouce Center中,ESRI介绍了两种创建Feature的方法(可以在本地的Geodatabase和sde的featureclass

一、

IFeatureClass.CreateFeature,在这种方法最后需要加上IFeature.Store去提交创建的要素,本人认为这种方法相比下面一种方法更好些,因为Store的方法能够直接提交修改并在数据库中看到,不会因为其他复杂的操作影响数据入库。下面是在SDE库中创建IFeature的代码给大家参考一下:

IAoInitialize m_AoInitializa = new AoInitializeClass();
esriLicenseStatus pEsriLicenseStatus=m_AoInitializa.Initialize(esriLicenseProductCode.esriLicenseProductCodeEngineGeoDB);

IPropertySet propSet = new PropertySetClass();
propSet.SetProperty("SERVER", "192.168.1.143");
propSet.SetProperty("INSTANCE", "5151");
propSet.SetProperty("USER", "myTestUser");
propSet.SetProperty("PASSWORD", "123456");
propSet.SetProperty("VERSION", "SDE.DEFAULT");

IWorkspaceFactory pwf = new SdeWorkspaceFactoryClass();
IFeatureWorkspace pFeatureWorkspace= (IFeatureWorkspace)(pwf.Open(propSet, 0)) ;
IFeatureClassfeaClass=pFeatureWorkspace.OpenFeatureClass("要打开的Featureclass名字");
 
IFeature feature = feaClass.CreateFeature();
feature.Shape=IGeometry;//(这里的IGeometry可以是IPolygon,IPolyline,IPoint)

int fieldindex = feature.Fields.FindField("字段名");
feature.set_Value(fieldindex, "字段值");
feature.Store();

二、

IFeatureClass.CreateFeatureBuffer,这个方法采用插入游标(Insert Cursors)的方法,在创建简单数据的时候效率会比第一种方法更快些,但是在ESRI的官网上提到使用IFeatureCursor.InsertFeature方法时,复杂的操作和各种事件的触发不能够保证。根据自己实际操作的心得,有时候会出现数据创建延时,明明代码已经通过了,但数据库中的数据要过很久才能显示出来,甚至有时候都显示不出来。这个客户肯定接受不了这种没有保证的数据创建。还有一点,在使用SDE库时,这种方法只适用于没有注册版本的datesetfeatureclass(这个仅仅是在我的程序中出现过这种问题,仅供参考),下面为代码(打开SDE的部分就不重复了)

IFeatureCursor feaCursor = feaClass.Insert(true);
IFeatureBuffer feaBuffer = feaClass.CreateFeatureBuffer();
feaBuffer.Shape = IGeometry;//(这里的IGeometry可以是IPolygon,IPolyline,IPoint)

int fieldindex = feaBuffer.Fields.FindField("字段名");
if (fieldindex >= 0)
{                              
      feaBuffer.set_Value(fieldindex, "字段值" );
}

feaCursor.InsertFeature(feaBuffer);

经过一位网友的帮助,以上的文章有不足的地方,就是IFeatureClass.CreateFeatureBuffer在featureclass中插入一条记录,在本文中feaCursor.InsertFeature(feaBuffer)之后加上feaCrusor.Fulsh()将创建的记录输入到数据库中,而且在面对大数据量插入的时候用IFeatureClass.CreateFeatureBuffer()效率比IFeatureClass.CreateFeature高,详细可以参见以下网址:LINK,这里面有详细介绍.

 

三、

使用IFeatureClassWriter接口

public void DrawPoint(ILayer pLayer,double X,double Y)
        {
            IFeatureLayer pFeatureLayer = pLayer as IFeatureLayer;
            IFeatureClass pFeatureClass = pFeatureLayer.FeatureClass;
            IFeatureClassWrite fr = pFeatureClass as IFeatureClassWrite;
            IFeature pFeature;
            IPoint pPoint;
 
            //pWorkspaceEdit.StartEditing(true);
            pWorkspaceEdit.StartEditOperation();
            pFeature = pFeatureClass.CreateFeature();
            pPoint = new PointClass();
            pPoint.PutCoords(X, Y);
            pFeature.Shape = pPoint;
            fr.WriteFeature(pFeature);
            pWorkspaceEdit.StopEditOperation();
        }