C# Arcgis Engine 獲得滑鼠按下位置的要素

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public IFeature GetFeatureOnMouseDown(IPoint point)        {            try            {                ILayer layer = Common.GetLayerByName(mMap, "地塊");                if (layer == null)                {                    MessageBox.Show("請載入地塊圖層！", "提示");                    return null;                }                //IFeatureLayer fLayer = layer as IFeatureLayer;                //IFeatureSelection featureSelection = fLayer as IFeatureSelection;                //featureSelection.Clear();                //if (featureSelection == null)                //{                //    return null;                //}                IFeatureLayer featureLayer = layer as IFeatureLayer;                if (featureLayer == null)                    return null;                IFeatureClass featureClass = featureLayer.FeatureClass;                if (featureClass == null)                    return null;                //IPoint point = axMapControl1.ActiveView.ScreenDisplay.DisplayTransformation.ToMapPoint(x, y);                IGeometry geometry = point as IGeometry;                double length = ConvertPixelsToMapUnits(axMapControl1.ActiveView, 4);                ITopologicalOperator pTopo = geometry as ITopologicalOperator;                IGeometry buffer = pTopo.Buffer(length);                geometry = buffer.Envelope as IGeometry;                ISpatialFilter spatialFilter = new SpatialFilterClass();                spatialFilter.Geometry = geometry;                switch (featureClass.ShapeType)                {                    case esriGeometryType.esriGeometryPoint:                        spatialFilter.SpatialRel = esriSpatialRelEnum.esriSpatialRelContains;                        break;                    case esriGeometryType.esriGeometryPolygon:                        spatialFilter.SpatialRel = esriSpatialRelEnum.esriSpatialRelIntersects;                        break;                    case esriGeometryType.esriGeometryPolyline:                        spatialFilter.SpatialRel = esriSpatialRelEnum.esriSpatialRelCrosses;                        break;                }                spatialFilter.GeometryField = featureClass.ShapeFieldName;                IQueryFilter filter = spatialFilter as IQueryFilter;                IFeatureCursor cursor = featureClass.Search(filter, false);                IFeature pfeature = cursor.NextFeature();                if (pfeature != null)                {                    return pfeature;                    //featureSelection.Add(pfeature);                    //pfeature = cursor.NextFeature();                }                else                {                    return null;                }            }            catch            {                return null;            }        }

大家可以修改一下My Code，圖層改成你需要的圖層即可。也可以寫成類。只是寫成類的話，變數可能會多一點。

if (pfeature != null)                {                    return pfeature;                    //featureSelection.Add(pfeature);                    //pfeature = cursor.NextFeature();                }

此處也可以將if改成while，如果選擇的是多個要素的話。將我注釋掉的代碼開啟即可選擇多個要素。

C# Arcgis Engine 獲得滑鼠按下位置的要素