文章目錄

• QueryFilter屬性查詢(xún)
• SpatialFilter空間查詢(xún)
• Cursor游標(biāo)

QueryFilter屬性查詢(xún)

得到將要查詢(xún)的圖層

IFeatureLayer pFeatureLayer = this.axMapControl1.get_Layer(0) as IFeatureLayer;IFeatureSelection pFeatureSelection = pFeatureLayer as IFeatureSelection;

創(chuàng)建查詢(xún)，并設(shè)置屬性

IQueryFilter pQueryFilter = new QueryFilterClass();pQueryFilter.WhereClause = "ID = 2"; //查詢(xún)條件

執(zhí)行查詢(xún)

pFeatureSelection.SelectFeatures(pQueryFilter, esriSelectionResultEnum.esriSelectionResultNew, false);

刷新圖層

axMapControl1.Refresh();

SpatialFilter空間查詢(xún)

得到將要查詢(xún)的圖層

IFeatureLayer pFeatureLayer = axMapControl1.get_Layer(layerNum) as IFeatureLayer;

創(chuàng)建空間查詢(xún)類(lèi)

ISpatialFilter spatialFilter = new SpatialFilterClass();//設(shè)置過(guò)濾器的Geometry屬性IPoint pPoint = new PointClass();pPoint.PutCoords(e.mapX, e.mapY);spatialFilter.Geometry = pPoint;spatialFilter.SpatialRel = esriSpatialRelEnum.esriSpatialRelIntersects; //空間過(guò)濾關(guān)系

執(zhí)行查詢(xún)，并返回游標(biāo)

IFeatureCursor featureCursor = pFeatureLayer.Search(spatialFilter, false);

遍歷結(jié)果，進(jìn)行閃爍

IFeature pFeature;while ((pFeature = featureCursor.NextFeature()) != null){axMapControl1.FlashShape(pFeature.Shape); //在地圖控件上閃爍顯示圖形}

Cursor游標(biāo)

本質(zhì)上是一個(gè)指向數(shù)據(jù)的指針，本身并不包含數(shù)據(jù)內(nèi)容，它是連接到Row對(duì)象或要素對(duì)象的橋梁

三種類(lèi)型：

查詢(xún)游標(biāo)

插入游標(biāo)

更新游標(biāo)

通過(guò)與之相適應(yīng)的方法來(lái)獲得，如Search、Insert、Update方法

總結(jié)

以上是生活随笔為你收集整理的[AE] ArcGIS Engine - 属性查询与空间查询 - QueryFilter|SpatialFilter的全部?jī)?nèi)容，希望文章能夠幫你解決所遇到的問(wèn)題。

如果覺(jué)得生活随笔網(wǎng)站內(nèi)容還不錯(cuò)，歡迎將生活随笔推薦給好友。